CN-116852521-B - Tensioning machine capable of being automatically positioned and automatic positioning method thereof

CN116852521BCN 116852521 BCN116852521 BCN 116852521BCN-116852521-B

Abstract

The application relates to a tensioning machine capable of being automatically positioned and an automatic positioning method thereof. The tensioning machine comprises a tensioning device, a driving unit and a control unit, wherein the tensioning device comprises a shell, a tensioning rod assembly and a detection assembly, one end of the tensioning rod assembly is movably and coaxially inserted into the shell, the end of the tensioning rod assembly is provided with a tensioning head for tensioning a piece to be tensioned, one end of the shell in the axial direction is defined as a machine head end, the detection assembly is arranged at the machine head end, the driving unit is in transmission connection with the tensioning device, and the control unit is in communication connection with the detection assembly. In the automatic positioning process, the detection assembly can measure measurement results such as the size parameter of the tension screw of the piece to be tensioned and the relative position between the pull head and the tension screw, and can convert the measurement results into measurement signals, and the control unit can control the driving unit to drive the tension device to move relative to the piece to be tensioned based on the measurement signals, so that the tension head is coaxially positioned on the tension screw, and the tension head is controlled to engage the tension screw to a preset length.

Inventors

LIN JIANHUANG
FANG FAN
YUAN WENJUN

Assignees

汤始建华建材（上海）有限公司

Dates

Publication Date: 20260505
Application Date: 20230731

Claims (10)

1. A tensioning machine capable of being automatically positioned, characterized by comprising the following steps: The stretching device comprises a shell, a stretching rod assembly and a detection assembly, wherein one end of the stretching rod assembly in the axial direction of the stretching device is movably and coaxially inserted into the shell, one end of the stretching rod assembly, which is inserted into the shell, is provided with a stretching head for stretching a piece to be stretched, one end of the shell in the axial direction is defined as a machine head end, the detection assembly is arranged at the machine head end, the detection assembly comprises a support, a first detection element, a second detection element, a third detection element and a fourth detection element, the support comprises a first support arm, two second support arms and two light curtain frames, the first support arm is connected to the upper side of the machine head end and extends outwards from the machine head end in a bending manner relative to the machine shell, the two second support arms are respectively connected to the two sides of the machine head end in the radial direction relative to the machine shell, each second support arm extends outwards from the machine head end in a bending manner relative to the machine head end, the two light curtain frames are respectively connected to the two sides of the machine shell in the radial direction relative to the machine head end, and each light curtain frame is connected to one end of the machine shell; The first detection element is arranged on the first support arm, one part of the second detection element is arranged on one second support arm, the other part of the second detection element is arranged on the other second support arm, the third detection element is arranged on one second support arm, one part of the fourth detection element is arranged on one light curtain frame, the other part of the fourth detection element is arranged on the other light curtain frame, and the first detection element, the second detection element, the third detection element and the fourth detection element are used for measuring the dimensional parameters of a tensioning screw of a piece to be tensioned and the relative positions between the tensioning head and the tensioning screw and can convert a measurement result into a measurement signal; the driving unit is in transmission connection with the tensioning device and is used for driving the tensioning device to move relative to the piece to be tensioned; the control unit is in communication connection with the detection assembly, and can control the driving unit to drive the tensioning device to move relative to the piece to be tensioned based on the measurement signal, so that the tensioning head is coaxially opposite to the tensioning screw rod, and the tensioning head is controlled to be meshed with the tensioning screw rod to reach the preset length.
2. A tensioning machine according to claim 1, wherein the first detection element is for measuring the distance of the tensioning screw from the first detection element, and the second detection element is for detecting the diameter of the tensioning screw and the start position of the thread on the tensioning screw, so that the control unit can control the tensioning head to be coaxially aligned with the tensioning screw based on the measurement result of the first detection element and the measurement result of the second detection element; the third detection element is used for detecting the distance between the machine head end and the tensioning baffle of the piece to be tensioned, and the fourth detection element is used for detecting the position of the tensioning head in the machine shell and the distance of the tensioning screw extending into the machine shell.
3. A tensioning machine according to claim 1, wherein the housing comprises a body and a piston rod coaxially disposed, the body having a cavity extending through opposite ends thereof, the piston rod being movably inserted into the cavity and closing the tail end of the machine; The tension rod assembly can rotate independently around the central axis of the machine body and the piston rod relative to the machine body and can move in a direction approaching to the pipe die, or can move together with the piston rod relative to the machine body in a direction far away from the pipe die.
4. The tension machine of claim 3, wherein the tension rod assembly further comprises a tension rod and a tail nut, the tail nut is fixedly connected to one end of the piston rod, which is far away from the machine head end, and the tension rod sequentially penetrates through the tail nut and the piston rod and is in threaded connection with the tail nut.
5. A tensioner as claimed in claim 1, wherein the first and third sensing elements are laser rangefinders and the second and fourth sensing elements are correlation measuring light curtains.
6. A tensioning machine according to claim 1, wherein the tensioning device further comprises a nut locking assembly provided at the machine head end, the nut locking assembly having a nut sleeve coaxially provided with the machine housing, the nut sleeve being adapted to be fitted over a tensioning nut of the piece to be tensioned and being controllably rotatable about its own central axis for locking the tensioning nut.
7. A method of automatically positioning a tensioning machine according to any one of claims 1 to 6, comprising the steps of: S1, acquiring a first measured value by using a second detection element, and acquiring a second measured value by using a first detection element, wherein the stretching device is controlled to move relative to a piece to be stretched based on the first measured value and the second measured value, so that a stretching head of the stretching device coaxially pairs with a stretching screw rod positioned on the piece to be stretched; S2, a third measuring value is obtained by using a third detecting element, the stretching device is controlled to move along the axial direction of the stretching device based on the third measuring value so as to be close to the piece to be stretched and lock a stretching nut of the piece to be stretched, and the third measuring value is the distance between the machine head end and a stretching baffle of the piece to be stretched; S3, acquiring a fourth measured value by using a fourth detection element, and controlling the tensioning head to move along the axial direction and engage the tensioning screw rod to reach a preset length based on the first measured value and the fourth measured value, wherein the fourth measured value comprises the position of the tensioning head in a shell of the tensioning device and the length of the tensioning screw rod extending into the shell.
8. The automatic positioning method according to claim 7, wherein step S1 includes: S12, moving the tensioning device along the radial direction of the tensioning device based on the measured diameter of the tensioning screw, and acquiring a plurality of second measured values by using a first detection element in the moving process; S13, extracting the minimum value from the acquired plurality of second measured values; S14, adjusting the tensioning device along the radial direction of the shell based on the extracted minimum value, so that the tensioning head is opposite to the tensioning screw rod in the radial direction; s15, comparing the extracted minimum value with a theoretical value; S16, adjusting the tensioning device along the height direction based on the comparison result, so that the tensioning head is opposite to the tensioning screw rod along the height direction.
9. The automatic positioning method according to claim 8, wherein step S2 includes: s22, adjusting the speed of the tensioning device moving along the axial direction of the tensioning device based on the third measured value and the first measured value; S23, moving the tensioning device until touching a tensioning baffle of the piece to be tensioned, so that a nut sleeve is sleeved on the tensioning nut; S24, locking the tensioning nut.
10. The automatic positioning method according to claim 8, wherein step S3 includes: s32, based on the first measured value and the fourth measured value, controlling the tensioning head to move along the axial direction to engage the tensioning screw, and simultaneously controlling the speed of engaging the tensioning screw; S33, acquiring the fourth measurement value in real time by using a fourth detection element until the meshing length of the tensioning head and the tensioning screw reaches a preset length.

Description

Tensioning machine capable of being automatically positioned and automatic positioning method thereof Technical Field The application relates to the technical field of production of building pipe piles, in particular to an automatic positioning tensioning machine and an automatic positioning method thereof. Background Along with the development of concrete technology, the technology of concrete pipe piles is mature, and the concrete pipe piles are widely applied to various fields of bridges, ports, railways, hydraulic engineering and the like besides industrial and civil buildings. In the production of concrete pipe piles, firstly, a reinforcement cage with end plates is placed in a pipe pile die (hereinafter referred to as a pipe die), then concrete is fed into the pipe die, and then the pipe piles are obtained through the steps of centrifugation, primary steam curing, demoulding and advanced steam curing in sequence. In order to enable the prepared pipe pile to bear higher load in the use process, the step of prestress tensioning is needed to be added when the concrete pipe pile is produced, specifically, the prestress of the pipe pile is controlled through the tensioning numerical value of a tensioning machine, the distance parameter between a tensioning screw of the pipe pile and a tensioning connection sleeve of the tensioning machine is extremely critical, and whether the sleeve connection is in place or not affects the value of the pipe pile tensioning and even the smooth completion of the pipe pile tensioning process, so that the tensioning connection sleeve of the tensioning machine needs to be positioned before tensioning, and the connection sleeve and the tensioning screw of a pipe die are mutually centered. However, in the prior art, the tensioning screw rod of the pipe die and the tensioning connection sleeve member of the tensioning machine are positioned by visual inspection of operators and directly depend on the operation experience of the operators, so that the operators have strict requirements, and the manual positioning mode has instability and cannot ensure that the sleeve joint is successful every time, thereby causing low positioning efficiency. More seriously, if the tension screw of the pipe die is failed to be connected with the tension sleeve of the tension machine, the whole pipe pile is directly scrapped, related equipment such as the tension screw and the tension sleeve can be damaged to different degrees, the quality of the pipe pile product is abnormal or scrapped due to the damage of the equipment, and unnecessary economic loss is caused. Disclosure of Invention Based on the above, it is necessary to provide an automatic positioning tensioning machine and an automatic positioning method thereof, which are necessary to solve the problems that in the prior art, mainly, the tensioning screw of the tensioning connection sleeve and the pipe die are positioned in a manual visual inspection mode, so that the sleeve jointing efficiency between the tensioning connection sleeve and the pipe die is low and unnecessary economic loss is easy to cause. According to one aspect of the present application, there is provided an automatically positionable tensioning machine comprising: The stretching device comprises a shell, a stretching rod assembly and a detection assembly, wherein one end of the stretching rod assembly in the axial direction of the stretching rod assembly is movably and coaxially inserted into the shell, one end of the stretching rod assembly, which is inserted into the shell, is provided with a stretching head for stretching a piece to be stretched, one end of the shell in the axial direction is defined as a machine head end, the detection assembly is arranged at the machine head end, and the detection assembly is used for measuring the dimensional parameters of a stretching screw of the piece to be stretched and the relative position between the stretching head and the stretching screw and converting the measurement result into a measurement signal; the driving unit is in transmission connection with the tensioning device and is used for driving the tensioning device to move relative to the piece to be tensioned; the control unit is in communication connection with the detection assembly, and can control the driving unit to drive the tensioning device to move relative to the piece to be tensioned based on the measurement signal, so that the tensioning head is coaxially opposite to the tensioning screw rod, and the tensioning head is controlled to be meshed with the tensioning screw rod to reach the preset length. In one embodiment, the detection assembly comprises a bracket, a first detection element and a second detection element, wherein the first detection element and the second detection element are arranged on the bracket, the bracket is connected with the shell, the first detection element is arranged right above the machine head end of the bracket, and the second