Search

CN-224209529-U - Novel pre-tightening mechanism

CN224209529UCN 224209529 UCN224209529 UCN 224209529UCN-224209529-U

Abstract

The utility model discloses a novel pre-tightening mechanism which is characterized by comprising a fastening table, wherein a fixing frame is fixedly arranged on the top surface of the fastening table, a power cylinder is fixedly arranged on the top surface of the fastening table, a cylinder shaft is arranged in the power cylinder, a limit shell is arranged on one side of the power cylinder and the top surface of the fixing frame, a pre-tightening assembly is arranged on the inner circular wall surface of the limit shell and is used for pre-tightening a workpiece, when the power cylinder is started, if a spring causes a plug bolt to generate circumferential rotation trend due to the factors of uneven spring compression, mechanical assembly errors and the like through arranging a sliding sleeve, a thrust bearing immediately plays a role, a shaft ring and the plug bolt are fixedly sleeved, and when the plug bolt has rotation trend, a rolling body of the thrust bearing rolls between the shaft ring and a seat ring, the shaft ring is allowed to rotate for a certain degree relative to the seat ring, circumferential rotation stress is converted into rolling friction in the bearing, and the whole pre-tightening process is ensured to be stable and orderly.

Inventors

  • GU JIAN
  • Zhang Caiyang
  • CHENG TINGMAO
  • ZHU XIAOCHENG
  • JIN YU
  • WEI JIAYI

Assignees

  • 上海固极智能科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250526

Claims (7)

  1. 1. A novel pretension mechanism, characterized by comprising: The fixing device comprises a fastening table (1), wherein a fixing frame (2) is fixedly arranged on the top surface of the fastening table (1), a power cylinder (4) is fixedly arranged on the top surface of the fastening table (1), a cylinder shaft (5) is arranged in the power cylinder (4), limit shells (7) are arranged on one side of the power cylinder (4) and the top surface of the fixing frame (2), a movable pressure head (6) is arranged in one limit shell (7), and a fixed pressure head (3) is arranged in the other limit shell (7); The pre-pressing assembly is arranged on the inner circular wall surface of the limiting shell (7) and is used for pre-pressing the workpiece.
  2. 2. The novel pretensioning mechanism of claim 1, wherein the pretensioning assembly comprises: sliding sleeve (8), sliding sleeve (8) movable sleeve establishes in the inside of spacing shell (7), the inside movable sleeve of sliding sleeve (8) is equipped with stopper and beats bolt (11), through-hole (12) have been seted up to one side of sliding sleeve (8), screw hole (10) have been seted up to one end of jar axle (5), stopper beat bolt (11) and screw hole (10) threaded connection together, the inside of spacing shell (7) is provided with spring (9), the interior circular wall fixed mounting of through-hole (12) has thrust bearing (13), stopper beat bolt (11) and thrust bearing's the fixed cover of pedestal collar establish together.
  3. 3. The novel pre-tightening mechanism according to claim 2, wherein two limiting grooves (14) are formed in the inner circular wall surface of the limiting shell (7), two limiting blocks (15) are fixedly mounted on the outer circular wall surface of the sliding sleeve (8), and the limiting blocks (15) and the limiting grooves (14) are slidably sleeved together.
  4. 4. The novel pre-tightening mechanism according to claim 2, wherein the fixed pressure head (3) and the movable pressure head (6) are provided with grooves (17) on one side, first magnetic blocks (18) are fixedly arranged on the inner circular wall surfaces of the grooves (17), mounting rings (19) are fixedly arranged on the inner circular wall surfaces of the sliding sleeves (8), second magnetic blocks (20) are fixedly arranged on the inner circular wall surfaces of the mounting rings (19), and the first magnetic blocks (18) are adsorbed with the second magnetic blocks (20).
  5. 5. A novel pretensioning mechanism according to claim 2, characterized in that two rubber columns (27) are fixedly mounted on one side of the stopper bolt (11).
  6. 6. The novel pre-tightening mechanism according to claim 1, wherein one side of the fixed pressure head (3) and one side of the movable pressure head (6) are adhered with an anti-slip pad (16).
  7. 7. The novel pre-tightening mechanism according to claim 1, wherein the two sides of the limiting shell (7) are fixedly provided with the connecting plate (21), one side of the connecting plate (21) is provided with two connecting holes (22), the connecting holes (22) are internally connected with connecting bolts (23) in a threaded manner, the connecting bolts (23) are connected with the power cylinder (4), the bottom surface of the limiting shell (7) is fixedly provided with the fixing plate (24), one side of the fixing plate (24) is provided with two fixing holes (26), the fixing holes (26) are internally connected with fixing bolts (25), and the fixing bolts (25) are in threaded connection with the fastening table (1).

Description

Novel pre-tightening mechanism Technical Field The utility model relates to the technical field of mechanical tools, in particular to a novel pre-tightening mechanism. Background The machine tool fixture is one technological equipment for machining metal workpiece, and has the main functions of clamping workpiece to ensure that the workpiece is not separated from the proper position. In the prior art, for a side press machine tool fixture which is pushed horizontally, before a cylinder after workpiece positioning is clamped, in order to prevent the workpiece from falling or from displacement, the workpiece is often required to be manually held, staff cannot operate by both hands due to manual holding, and potential safety hazards and risks of crush injury can be brought by manual holding. For example, the Chinese patent publication No. CN215659157U discloses a spring floating pre-clamping structure, which comprises a fixed pressure head, a movable pressure head and a power cylinder, wherein the fixed pressure head and the movable pressure head are horizontally and coaxially arranged, a spring floating pre-clamping mechanism for pushing the movable pressure head to apply pre-clamping force to a workpiece is arranged between the power cylinder and the movable pressure head, the spring floating pre-clamping mechanism consists of a floating sliding sleeve and a pressure spring, the movable pressure head is arranged at the front end of the floating sliding sleeve, the pressure spring is pressed between the floating sliding sleeve and a cylinder body of the power cylinder, a plugging screw for pushing the movable pressure head to horizontally advance to match with the fixed pressure head to clamp the workpiece is fixedly arranged at the front end of a cylinder rod of the power cylinder, the front end of the plugging screw is slidably penetrated into a floating sleeve cavity, an expanding head body is formed at the front end of the plugging screw, and a pre-clamping elastic movable space is reserved between the front end surface of the expanding head body and the movable pressure head. The utility model is safe and reliable, convenient to operate and simple to maintain, and can effectively prevent the workpiece from falling before and after clamping. The existing spring floating pre-clamping structure has the defects that, for example, a stopper screw further compresses a spring in the moving process, and certain rotation stress is generated in the spring compression process, so that circumferential rotation stress is caused to workpieces contacted with two ends, and the process implementation is influenced. Disclosure of utility model Aiming at the defects of the prior art, the utility model provides a novel pre-tightening mechanism, and solves the problems in the background art. The technical aim of the utility model is realized by the following technical scheme: The novel pre-tightening mechanism comprises a fastening table, a fixing frame, a pre-tightening assembly and a pre-tightening workpiece, wherein the fixing frame is fixedly arranged on the top surface of the fastening table, a power cylinder is fixedly arranged on the top surface of the fastening table, a cylinder shaft is arranged in the power cylinder, limiting shells are arranged on one side of the power cylinder and the top surface of the fixing frame, a movable pressure head is arranged in one of the limiting shells, a fixed pressure head is arranged in the other limiting shell, and the pre-tightening assembly is arranged on the inner circular wall surface of the limiting shell and used for pre-tightening the workpiece. Preferably, the pre-compacting assembly comprises a sliding sleeve, wherein the sliding sleeve is movably sleeved in a limiting shell, a plug bolt is movably sleeved in the sliding sleeve, a through hole is formed in one side of the sliding sleeve, a threaded hole is formed in one end of a cylinder shaft, the plug bolt is in threaded connection with the threaded hole, a spring is arranged in the limiting shell, a thrust bearing is fixedly mounted on the inner circular wall surface of the through hole, and the plug bolt is fixedly sleeved with a shaft collar of the thrust bearing. Preferably, two limiting grooves are formed in the inner circular wall surface of the limiting shell, two limiting blocks are fixedly arranged on the outer circular wall surface of the sliding sleeve, and the limiting blocks and the limiting grooves are sleeved together in a sliding mode. Preferably, the fixed pressure head and one side of the movable pressure head are both provided with grooves, the inner circular wall surface of each groove is fixedly provided with a first magnetic block, the inner circular wall surface of each sliding sleeve is fixedly provided with a mounting ring, the inner circular wall surface of each mounting ring is fixedly provided with a second magnetic block, and the first magnetic blocks are adsorbed with the second magnetic b