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CN-114132864-B - Safety nut mechanism and car lifting jack

CN114132864BCN 114132864 BCN114132864 BCN 114132864BCN-114132864-B

Abstract

The invention belongs to the technical field of screw transmission, and discloses a safety nut mechanism and a car lifting jack. The safety nut mechanism comprises a nut connecting seat, a screw rod, a working nut and a safety assembly. Wherein, the nut connecting seat can be lifted and lowered, and is connected with a bracket of the car lifting jack. The rotatable lead screw movably penetrates through the nut connecting seat. The working nut is arranged on one side of the nut connecting seat and can not rotate relative to the nut connecting seat, and the working nut is in threaded connection with the screw rod. The safety component comprises a safety nut, a connecting component and a limiting piece, wherein the safety nut is arranged on the other side of the nut connecting seat and is in threaded connection with the screw rod, the limiting piece is used for limiting rotation of the safety nut, and the connecting component is used for pressing against the safety nut after the working nut fails. After the working nut fails, the nut connecting seat is pressed against the safety nut through the connecting component, and load transmission is stable. Moreover, the safety nut can replace the working nut to continue the loading and unloading operation of the car lifting jack.

Inventors

  • LI SHA
  • CHENG YUANXIONG

Assignees

  • 北京铁道工程机电技术研究所股份有限公司

Dates

Publication Date
20260512
Application Date
20211129

Claims (7)

  1. 1. A safety nut mechanism, comprising: a liftable nut connecting seat (1) configured to be connected with a bracket of a car lifting jack; The rotatable lead screw (2) is movably penetrated through the nut connecting seat (1); The working nut (3) is arranged on one side of the nut connecting seat (1) in a non-rotatable manner with the nut connecting seat (1) and is in threaded connection with the lead screw (2); The safety component (4) comprises a safety nut (41), a connecting component (42) and a limiting piece (43), wherein the safety nut (41) is arranged on the other side of the nut connecting seat (1) and is in threaded connection with the screw rod (2), the connecting component (42) and the limiting piece (43) are both arranged on the nut connecting seat (1), the limiting piece (43) is connected with the safety nut (41) to limit the rotation of the safety nut (41), and the connecting component (42) is used for pressing against the safety nut (41) after the working nut (3) fails; The connecting assembly (42) comprises a first connecting piece (421), the first connecting piece (421) is fixedly connected to the nut connecting seat (1), the safety nut (41) is arranged between the first connecting piece (421) and the nut connecting seat (1) along a first direction, the first direction is parallel to the axial direction of the screw rod (2), the safety nut (41) and the limiting piece (43) are connected in a relatively sliding mode along the first direction, and after the working nut (3) fails, the nut connecting seat (1) can drive the first connecting piece (421) to press against the safety nut (41); one of the limiting piece (43) and the safety nut (41) is provided with a first guide protrusion (411), the other is provided with a first guide groove (431), and the first guide protrusion (411) and the first guide groove (431) are in sliding fit along the first direction and cannot rotate relatively; the limiting piece (43) is columnar, the limiting piece (43) is vertically and fixedly connected to the nut connecting seat (1), the safety nut (41) is provided with a guide limiting groove, and the limiting piece (43) can be inserted into the guide limiting groove in a relatively sliding manner.
  2. 2. The safety nut mechanism according to claim 1, characterized in that one of the limiting member (43) and the nut connecting seat (1) is provided with a second guide projection (432), and the other is provided with a second guide groove, and the second guide projection (432) and the second guide groove are slidably engaged in the first direction and are not rotatable relative to each other.
  3. 3. The safety nut mechanism according to claim 1, characterized in that one of the limiting member (43) and the connecting member (42) is provided with a third guide projection, and the other is provided with a third guide groove, and the third guide projection and the third guide groove are slidably fitted in the first direction and are prevented from rotating relatively.
  4. 4. A safety nut mechanism according to any one of claims 1 to 3, characterized in that the connection assembly (42) further comprises a second connection member (422), the second connection member (422) comprising a first plate (4221) and a second plate (4222), the first plate (4221), the second plate (4222) and the first connection member (421) being connected in sequence and forming a structure with a Z-shaped cross section, the first plate (4221) being fixedly connected to the nut connection seat (1).
  5. 5. The safety nut mechanism according to claim 4, characterized in that the first plate (4221) is detachably arranged on the nut connecting seat (1).
  6. 6. The safety nut mechanism according to claim 5, characterized in that the connecting assembly (42) further comprises a bolt (423), a through hole is provided in the first plate (4221), a threaded hole is provided in the nut connecting seat (1), and the bolt (423) passes through the through hole and is screwed in the threaded hole.
  7. 7. A car lifting machine comprising a safety nut mechanism as claimed in any one of claims 1 to 6.

Description

Safety nut mechanism and car lifting jack Technical Field The invention relates to the technical field of screw transmission, in particular to a safety nut mechanism and a car lifting jack. Background When the transportation vehicle is maintained, the transportation vehicle is required to be supported by the vehicle lifting jack so as to carry out maintenance operation on parts at the bottom of the vehicle, and the vehicle is lowered by the vehicle lifting jack after the maintenance is completed. The rail vehicle frame machine generally adopts screw nut transmission to realize lifting of the bracket, but the screw nut transmission has the prominent defect of large abrasion of working nuts, and potential safety hazards are brought to frame work. At present, in order to avoid faults of the working nut in the working process of the frame vehicle, a safety nut is usually arranged on a screw rod, and the safety nut is arranged below the working nut, so that synchronous lifting movement with the working nut is realized through a pin connection method and the like. In long-term use, the safety nut does not bear the bracket load of the car lifting machine, the distance between the bracket of the car lifting machine and the safety nut gradually shortens along with the self-abrasion of the working nut, and when the abrasion reaches a set limit value, the photoelectric sensor is triggered to give an alarm and stop the car lifting operation. However, when the working nut is accidentally collapsed, the damaged working nut is blocked between the bracket and the safety nut, the damaged working nut is in various forms, the bracket load cannot be stably transmitted to the safety nut, the vehicle can vibrate instantly, even the vehicle body on the vehicle can be seriously influenced, and a large operation risk exists. Moreover, when the bracket is placed on the safety nut, the car lifting machine can only be temporarily kept stable, and has no lifting or car falling function any more. If the vehicle needs to continue to fall down. Only other emergency measures besides the car lifting machine can be taken, which seriously affect the production efficiency and the operation benefit. Disclosure of Invention An object of the present invention is to provide a safety nut mechanism that can smoothly transfer a load of a bracket to a safety nut after a malfunction of a work nut and realize a load-falling function of the bracket by the safety nut. To achieve the purpose, the invention adopts the following technical scheme: A safety nut mechanism comprising: A liftable nut connecting seat configured to be connected with a bracket of the car lifting machine; The rotatable lead screw is movably penetrated through the nut connecting seat; the working nut is arranged on one side of the nut connecting seat in a non-rotatable manner and is in threaded connection with the screw rod; The safety component comprises a safety nut, a connecting component and a limiting part, wherein the safety nut is arranged on the other side of the nut connecting seat and is in threaded connection with the screw rod, the connecting component and the limiting part are both arranged on the nut connecting seat, the limiting part is connected with the safety nut so as to limit the rotation of the safety nut, and the connecting component is used for pressing the safety nut after the working nut fails. Optionally, the coupling assembling includes first connecting piece, first connecting piece links firmly on the nut connecting seat, the safety nut sets up along first direction first connecting piece with between the nut connecting seat, first direction is on a parallel with the axial of lead screw, the safety nut with the locating part is followed first direction can relative slip ground is connected, after the work nut inefficacy, the nut connecting seat can drive first connecting piece presses and supports on the safety nut. Optionally, one of the limiting piece and the safety nut is provided with a first guide protrusion, the other one is provided with a first guide groove, and the first guide protrusion and the first guide groove are in sliding fit along the first direction and cannot rotate relatively. Optionally, one of the limiting piece and the nut connecting seat is provided with a second guide protrusion, the other one is provided with a second guide groove, and the second guide protrusion and the second guide groove are in sliding fit along the first direction and cannot rotate relatively. Optionally, one of the limiting piece and the connecting component is provided with a third guide protrusion, the other one is provided with a third guide groove, and the third guide protrusion and the third guide groove are in sliding fit along the first direction and cannot rotate relatively. Optionally, the locating part is the column, the locating part is perpendicular to be linked firmly on the nut connecting seat, guide limit groove has been seted up on the safety n