Lifting device for drop hammer impact test and drop hammer impact testing machine

Abstract

The invention discloses a drop hammer impact test lifting device and a drop hammer impact tester, and relates to the technical field of drop hammer test device structures, the drop hammer impact test lifting device comprises a support, a bearing frame, a driving device, a hanging structure, an unlocking structure and a protection structure, the bearing frame is installed on the support; the driving device is used for driving the bearing frame to move up and down on the bracket; the hanging structure comprises two hooks rotationally mounted on the bearing frame, hook parts of the two hooks are located below the rotating axis of the hooks and are oppositely arranged, the two hooks are provided with unlocking positions and hanging positions, and the two hook parts are used for being hung on the hanging parts of the drop hammer when the two hook parts are located at the hanging positions; the unlocking structure is mounted on the bearing frame and is used for driving the two hook parts to move from the hanging position to the unlocking position so as to release the drop hammer; the protection device is installed on the bearing frame and comprises a protection pin which can be horizontally and movably installed on the bearing frame. The invention aims to provide the drop hammer test device which is high in safety and convenient to control.

Description

Technical Field

[0001] The invention relates to the technical field of drop hammer test device structures, and in particular to a drop hammer impact test lifting device and a drop hammer impact test machine. Background Art

[0002] As the last safety protection device of the elevator, the buffer absorbs or consumes the kinetic energy of the car or counterweight device when the car or counterweight device loses control and crashes into the pit, causing the car or counterweight device to slow down and stop. Elevator buffers can be divided into (linear, nonlinear) energy storage buffers and energy consumption buffers. According to the requirements of TSG T7007-2022 "Elevator Type Test Rules", elevator buffers should be subjected to impact tests of maximum mass load and minimum mass load at maximum speed by free fall of heavy objects according to the load range they can bear. However, the equipment used by domestic approved elevator type test institutions to carry out buffer impact tests still has the problems of cumbersome control operations and operational safety hazards. Summary of the invention

[0003] The main purpose of the present invention is to provide a drop weight impact test lifting device and a drop weight impact test machine, aiming to provide a drop weight test device with high safety and easy control.

[0004] To achieve the above object, the present invention provides a lifting device for a drop weight impact test, wherein the lifting device for a drop weight impact test comprises: A bracket, extending up and down, and arranged on one side of the drop weight; A bearing frame, which can be movably mounted on the bracket up and down; A driving device, disposed between the support and the bearing frame, for driving the bearing frame to move up and down on the support; The hanging structure comprises two hooks arranged at intervals, the two hooks are rotatably mounted on the carrier, the hook parts of the two hooks are located below the rotation axis thereof and are arranged opposite to each other, so that during the rotation process of the two hooks, there are an unlocking position in which the two hook parts are separated from each other and a hanging position in which the two hook parts are close to each other, and the two hook parts are used to hang below the hanging part of the drop hammer in the hanging position; an unlocking structure, mounted on the carrier, for driving the two hooks to move from the hanging position to the unlocking position to release the drop hammer; and A protection device is installed on the support frame, and the protection device includes a protection pin which can be horizontally movably installed on the support frame. During the movable stroke of the protection pin, it has a protection position where it extends out of the end face of the support frame to extend into the pin hole of the drop hammer, and a release position where the support frame is retracted to disengage from the drop hammer.

[0005] In one embodiment, the driving device includes a driving member and a driving screw, the driving screw is extended up and down, and the driving screw is threadedly connected to the supporting frame, and the driving member drives the driving screw to rotate to drive the supporting frame to move up and down.

[0006] In one embodiment, two of the driving screw rods and two of the driving members are provided, and the two driving screw rods are located on both sides of the hanging structure.

[0007] In one embodiment, a first guiding slope is provided below the end of the hook portion of the hook, and the first guiding slope is used to abut against the hanging portion of the drop hammer when the carrier moves downward, so as to drive the two hooks to move from the hanging position to the unlocking position during the downward movement of the hook portion, so as to pass over the hanging portion of the drop hammer and be hung on the bottom of the hanging portion of the drop hammer.

[0008] In one embodiment, an unlocking portion is provided on the hook, and the unlocking portion is located on a side opposite to the two hooks. The unlocking structure includes an unlocking member that can be moved up and down, and the unlocking member is arranged corresponding to the unlocking portion. During the downward movement of the unlocking member, the unlocking member is abutted against the unlocking portion to drive the hook to move from the hanging position to the unlocking position.

[0009] In one embodiment, the unlocking portion is located laterally of the hook rotation axis in the horizontal direction.

[0010] In one embodiment, a second guiding inclined surface is provided on the unlocking portion, so that when the unlocking member abuts against the second guiding inclined surface, the force direction thereof is toward the unlocking position of the hook.

[0011] In one embodiment, the unlocking structure further comprises a hydraulic rod and a lever structure, one end of the lever structure is hinged to the hydraulic rod, the other end of the lever structure is hinged to the unlocking member, and the hydraulic rod extends upward to drive the unlocking member to move downward; Wherein, the lever arm of the lever structure corresponding to the hydraulic rod is greater than the lever arm corresponding to the unlocking member.

[0012] In one embodiment, the protection device further comprises a gas pressure rod, and the gas pressure rod is connected to the protection pin via a transmission structure to drive the protection pin to move between the protection position and the release position.

[0013] The present invention also provides a drop weight impact testing machine, wherein the drop weight impact testing machine comprises: A drop hammer, which has a plurality of hanging parts protruding from its side, and a plurality of groups of pin holes correspondingly arranged on its side; and, A plurality of lifting devices for drop hammer impact test, wherein the lifting devices for drop hammer impact test include a bracket, a bearing frame, a driving device, a hanging structure, an unlocking structure and a protective device, wherein the bracket is extended up and down and is used to be set on one side of the drop hammer; the bearing frame can be movably installed on the bracket up and down; the driving device is arranged between the bracket and the bearing frame, and is used to drive the bearing frame to move up and down on the bracket; the hanging structure includes two hooks arranged at intervals, the two hooks are rotatably installed on the bearing frame, the hook parts of the two hooks are located below the rotation axis thereof, and are arranged opposite to each other, so that during the rotation process of the two hooks, there is an unlocking position in which the two hook parts are away from each other. and a hanging position close to each other, the two hooks are used to hang on the lower part of the hanging part of the drop hammer when in the hanging position; the unlocking structure is installed on the carrier, and is used to drive the two hooks to move from the hanging position to the unlocking position to release the drop hammer; the protection device is installed on the carrier, and the protection device includes a protection pin that can be horizontally movably installed on the carrier, and in the movable stroke of the protection pin, it has a protection position extending out of the end face of the carrier to extend into the pin hole of the drop hammer, and a release position where the carrier is retracted to disengage from the drop hammer, and a plurality of drop hammer impact test lifting devices are arranged corresponding to the plurality of hanging parts to lift and release the drop hammer.

[0014] In the technical solution of the present invention, the drop weight impact test lifting device is mainly supported by the bracket, the bearing frame can be movably arranged on the bracket, and is driven by the driving device, so that the height of the bearing frame can be accurately controlled by controlling the driving device, and the bearing frame is provided with the hanging structure, the unlocking structure and the protection device. Specifically, the hanging structure includes two rotatable hooks arranged opposite to each other, and the hook parts of the two hooks are located below their rotation axes. In this way, when the hook part carries the heavy drop weight, when the gravity of the drop weight is applied to the hook, its gravity direction is along the radial direction of the rotation axis of the hook, so that its gravity does not have a component force that drives the hook to rotate laterally, and at the same time combined with the drop weight The greater the pressure applied to the hook, the greater the friction resistance, so that the hook forms a self-locking when carrying the drop hammer. The structure is simple, ingenious and highly reliable. For the self-locking hook, the unlocking structure is proposed, so that the drop hammer can be unhooked by controlling the unlocking structure to drive the hook to rotate, thereby ensuring that the unhooking process is controllable and safe. In addition, after the hook is hung on the drop hammer, the drop hammer is lifted. In order to achieve a safety protection effect, the support frame is also provided with the protection device, which mainly includes the protection pin, which extends from the support frame to the pin hole of the drop hammer to protect the drop hammer from falling off, and further ensure the safety of the drop hammer impact test lifting device during use. In this way, the safety performance required by this application, as well as the control reliability and convenience are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a drop weight impact testing machine provided by the present invention; Figure 2 A schematic diagram of the three-dimensional structure of an embodiment of a lifting device for a drop weight impact test provided by the present invention; Figure 3 for Figure 2 Another three-dimensional structural schematic diagram of; Figure 4 for Figure 2 Schematic diagram of a partial cross section at the middle hanging structure.

[0017] Description of Figure Numbers: 1000, drop hammer impact test machine; 100, drop hammer impact test lifting device; 1, bracket; 2, load-bearing frame; 3, driving device; 31, driving member; 32, driving screw; 4, hanging structure; 41, hook; 411, hook part; 412, first guide slope; 413, unlocking part; 414, second guide slope; 5, unlocking structure; 51, unlocking member; 52, hydraulic rod; 53, lever structure; 6, protection device; 61, protection pin; 62, pneumatic rod; 63, transmission structure; 200, drop hammer; 201, hanging part.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] As the last safety protection device of the elevator, the buffer absorbs or consumes the kinetic energy of the car or counterweight device when the car or counterweight device loses control and crashes into the pit, causing the car or counterweight device to slow down and stop. Elevator buffers can be divided into (linear, nonlinear) energy storage buffers and energy consumption buffers. According to the requirements of TSG T7007-2022 "Elevator Type Test Rules", elevator buffers should be subjected to impact tests of maximum mass load and minimum mass load at maximum speed by free fall of heavy objects according to the load range they can bear. However, the equipment used by domestic approved elevator type test institutions to carry out buffer impact tests still has the problems of cumbersome control operations and operational safety hazards.

[0023] In view of this, the present invention proposes a lifting device for a drop weight impact test, please refer to Figures 1 to 4 , is an embodiment of the drop weight impact test lifting device proposed in this application. The drop weight impact test lifting device will be described in detail below with reference to specific drawings.

[0024] See also Figures 1 to 4 The drop hammer impact test lifting device 100 includes a bracket 1, a carrier frame 2, a driving device 3, a hanging structure 4, an unlocking structure 5 and a protection device 6. The bracket 1 is extended up and down and is used to be set on one side of the drop hammer 200; the carrier frame 2 can be movably installed on the bracket 1 up and down; the driving device 3 is arranged between the bracket 1 and the carrier frame 2, and is used to drive the carrier frame 2 to move up and down on the bracket 1; the hanging structure 4 includes two hooks 41 arranged at intervals, and the two hooks 41 are rotatably installed on the carrier frame 2, and the hook parts 411 of the two hooks 41 are located below the rotation axis thereof and are arranged opposite to each other, so that during the rotation process of the two hooks 41, there are two hooks 41. The hook portions 411 have an unlocking position in which they are far apart from each other and a hanging position in which they are close to each other, and the two hook portions 411 are used to hang on the lower part of the hanging portion 201 of the drop hammer 200 when in the hanging position; the unlocking structure 5 is installed on the support frame 2, and is used to drive the two hook portions 411 to move from the hanging position to the unlocking position to release the drop hammer 200; the protection device 6 is installed on the support frame 2, and the protection device 6 includes a protection pin 61 that can be horizontally movably installed on the support frame 2, and in the movable stroke of the protection pin 61, it has a protection position in which it extends out of the end face of the support frame 2 to extend into the pin hole of the drop hammer 200, and a release position in which it retracts from the support frame 2 to disengage from the drop hammer 200.

[0025] In the technical solution of the present invention, the drop hammer impact test lifting device 100 is mainly supported by the bracket 1, the bearing frame 2 is movably arranged on the bracket 1, and is driven by the driving device 3, so that the height of the bearing frame 2 can be accurately controlled by controlling the driving device 3, and the bearing frame 2 is provided with the hanging structure 4, the unlocking structure 5 and the protection device 6. Specifically, the hanging structure 4 includes two rotatable hooks 41 arranged opposite to each other, and the hook portions 411 of the two hooks 41 are located below their rotation axis. In this way, when the hook portions 411 carry the heavy drop hammer 200, when the gravity of the drop hammer 200 is applied to the hook 41, its gravity direction is along the radial direction of the rotation axis of the hook 41, so that its gravity does not have a component force to drive the hook 41 to rotate laterally, and at the same time, combined with the drop hammer 200 The greater pressure of the hook 41 and the greater friction resistance make the hook 41 self-locking when carrying the drop hammer 200. The structure is simple, ingenious and reliable. For the self-locking hook 41, the unlocking structure 5 is proposed to drive the hook 41 to rotate by controlling the unlocking structure 5, so as to realize the unhooking of the drop hammer 200, and ensure the controllable and safe unhooking process. In addition, after the hook 41 is hung on the drop hammer 200, the drop hammer 200 is lifted. In order to achieve the effect of safety protection, the support frame 2 is also provided with the protection device 6. The protection device 6 mainly includes the protection pin 61. The protection pin 61 extends from the support frame 2 to the pin hole of the drop hammer 200, so as to realize the protection of the drop hammer 200 from falling off, and further ensure the safety of the drop hammer impact test lifting device 100 during use. In this way, the safety performance required by this application, as well as the control reliability and convenience are met.

[0026] Specifically, based on the fact that the height adjustment of the drop weight 200 in the existing test device relies on manual visual inspection, which makes the height adjustment of the drop weight 200 low in precision and time-consuming and labor-intensive, the present application proposes that the driving device 3 includes a driving member 31 and a driving screw 32, the driving screw 32 is extended up and down, and the driving screw 32 is threadedly connected to the carrier 2, and the driving member 31 drives the driving screw 32 to rotate to drive the carrier 2 to move up and down. The driving screw 32 drives the carrier 2 to move, which has a high driving precision, can meet the high-precision adjustment function requirements of the driving device 3, is easy to control, and has high reliability.

[0027] In addition, two of the driving screws 32 and the driving member 31 are provided, and the two driving screws 32 are located on both sides of the hanging structure 4. In order to ensure the stable lifting of the carrier 2 after loading and the balance during the lifting process, the present application also proposes that the driving screws 32 and the driving member 31 are respectively provided on both sides of the hanging structure 4, and the two driving screws 32 drive the carrier 2 to move. On the one hand, the load is shared, and the driving process of the two driving screws 32 is more reliable and stable, thereby making the lifting process more stable. On the other hand, the two driving screws 32 are limited, and the carrier 2 will not tilt laterally, thereby ensuring the balance of the carrier 2 during the activity process, and then ensuring the accuracy of the carrier 2 during the lifting process, meeting the functional requirements of the present application.

[0028] In addition, a first guiding slope 412 is provided below the end of the hook portion of the hook 41. The first guiding slope 412 is used to abut against the hanging portion 201 of the drop hammer 200 when the carrier 2 moves downward, so as to drive the two hook portions 411 to move from the hanging position to the unlocking position during the downward movement of the hook portion 411, so as to pass over the hanging portion 201 of the drop hammer 200 and be hung on the bottom of the hanging portion 201 of the drop hammer 200. It can be understood that the hook 41 has been described above for holding the drop hammer 200 by self-locking, that is, there is no limiting structure at the hook 41 that limits its rotation to the unlocked position, and the hook 41 can rotate freely when not holding the drop hammer 200. In this way, the action of the hook 41 holding the drop hammer 200 can be manually operated, and the operation process is free of resistance and convenient to operate. However, it still needs to be performed manually, so the present application further provides the first guiding inclined surface 412 at the bottom edge of the hook 41, so that when the hook 41 moves downward to abut against the holding portion 201 of the drop hammer 200, the holding portion 201 abuts against the first guiding inclined surface 41 2. When the hook 41 continues to move downward, the hanging part 201 pushes the hook 41 laterally along the first guiding slope 412, that is, automatically drives the hook 41 to move to the unlocking position, until the hanging part 201 passes over the hook part 411 of the hook 41, and the hook 41 is no longer in contact with the hanging part 201, so that the hook 41 is affected by its own gravity and rotates back to the hanging position, that is, the hook part 411 rotates to the bottom of the hanging part 201. At this time, the support frame 2 is controlled to move upward, and the hook part 411 can contact and support the hanging part 201, so as to complete the hanging of the hanging part 201, and at the same time complete the self-locking of the hook 41 to meet the subsequent lifting requirements. With such a configuration, the hanging step of the hanging part 201 does not require manual operation, and can be completed by moving the support frame 2 up and down. The structure is simple and the design is ingenious, which is convenient to operate and has high safety. It should be noted here that if the hook 41 is no longer in contact with the hanging portion 201 and cannot be rotated back to the hanging position due to its own gravity, or there is a hidden danger that it cannot be rotated back to the hanging position, this embodiment also provides an elastic reset member between the hook portion 411 and the carrier frame 2 to push the hook portion 411 to rotate back to the hanging position, thereby improving the structural reliability.

[0029] In addition, an unlocking portion 413 is provided on the hook 41, and the unlocking portion 413 is located on the opposite side of the two hooks 41. The unlocking structure 5 includes an unlocking member 51 that can be moved up and down, and the unlocking member 51 is arranged corresponding to the unlocking portion 413. During the downward movement of the unlocking member 51, the unlocking member 51 is abutted against the unlocking portion 413 to drive the hook 41 to move from the hanging position to the unlocking position. It has been described above that unlocking the hook 41 requires driving the hook 41 to rotate, so the unlocking structure 5 can be set in a variety of ways, including but not limited to the rotating driving member 31 set at the rotating shaft of the hook 41, the telescopic member set between the two hooks 41, etc., as long as the required unlocking action can be achieved. In this embodiment, the unlocking part 413 is set on the opposite side of the hook 41, and the unlocking structure 5 is set to the corresponding unlocking member 51. During the downward movement of the unlocking member 51, the unlocking member 51 can resist the unlocking part 413. Because the position where the unlocking member 51 applies force to the unlocking part 413 is located on one side of the rotation axis of the hook 41, and its force application direction is not toward the rotation axis of the hook 41, its force application has a tangential component along the rotation axis of the hook 41, so that the hook 41 can be driven to rotate, meeting the functional requirements. With such a configuration, the unlocking member 51 and the unlocking part 413 do not need to be tightly connected, and only need to have a relative position relationship in the up and down direction to achieve the required function, which is convenient for structural setting.

[0030] Specifically, the unlocking portion 413 is located on the side of the rotation axis of the hook 41 in the horizontal direction. The unlocking portion 413 can be located at any position on the opposite side of the two hooks 41, as long as the unlocking member 51 can drive it to rotate. In this embodiment, the unlocking portion 413 is limited to be located on the side of the rotation axis of the hook 41 in the horizontal direction, so that when the unlocking member 51 applies force to the hook 41, there is no component force toward the rotation axis of the hook 41, and the structure is more labor-saving, that is, it is easier to drive the hook 41 to rotate.

[0031] Furthermore, the unlocking portion 413 is provided with a second guiding slope 414, so that when the unlocking member 51 abuts against the second guiding slope 414, the force direction thereof is toward the unlocking position of the hook 41. The unlocking portions 413 on the two hooks 41 are both provided with the second guiding slope 414, and the second guiding slopes 414 of the two hooks 41 are opposite to each other, so that the two second guiding slopes 414 define a funnel-shaped guiding path that gradually decreases from top to bottom, on the one hand, guiding the unlocking member 51 to the middle of the two second guiding slopes 414 to drive the two hooks 41 to rotate in a balanced manner, and on the other hand, the resistance given to the unlocking member 51 by the two second guiding slopes 414 has components in opposite directions, so that the two components can offset each other, thereby reducing the resistance given to the unlocking member 51 in the up and down directions, which is more labor-saving and facilitates the unlocking operation of the hook 41 by the unlocking member 51.

[0032] In addition, the unlocking structure 5 also includes a hydraulic rod 52 and a lever structure 53, one end of the lever structure 53 is hinged to the hydraulic rod 52, and the other end of the lever structure 53 is hinged to the unlocking member 51, and the hydraulic rod 52 extends upward to drive the unlocking member 51 to move downward; wherein, the lever arm of the lever structure 53 corresponding to the hydraulic rod 52 is greater than the lever arm corresponding to the unlocking member 51. There are multiple driving modes for driving the unlocking structure 5 to move in the up and down directions. Considering that the mass of the drop hammer 200 is large and the unlocking member 51 needs to have a large driving force, the driving mode is set to the hydraulic rod 52 drive, especially the oil pressure rod. On this basis, the lever structure 53 is also provided on the carrier 2. On the one hand, the lever structure 53 is used to adjust the setting position of the hydraulic rod 52 to avoid setting it above the unlocking member 51, thereby avoiding the problem that the unlocking structure 5 occupies a large space. On the other hand, by adjusting the lever arm length ratio of the lever structure 53, the driving force of the unlocking member 51 can be further improved to meet the unlocking requirements required by this application.

[0033] In addition, the protection device 6 also includes a pneumatic rod 62, and the pneumatic rod 62 is connected to the protection pin 61 through a transmission structure 63 to drive the protection pin 61 to move between the protection position and the release position. The driving mode of the protection pin 61 can also be multiple, and it can be moved in the horizontal direction to extend into or out of the drop hammer 200. In this embodiment, the pneumatic rod 62 is set to drive the protection pin 61, which has a simple structure and is easy to arrange. The transmission structure 63 is also set between the pneumatic rod 62 and the protection pin 61 to change the relative position between the pneumatic rod 62 and the protection pin 61, so as to avoid the problem that the pneumatic rod 62 occupies a large space.

[0034] See also Figure 1 The present invention also proposes a drop hammer impact tester 1000, the drop hammer impact tester 1000 includes the drop hammer 200 and a plurality of drop hammer impact test lifting devices 100, the drop hammer 200 is provided with a plurality of hanging parts 201 on the side, and a plurality of groups of pin holes are correspondingly provided on the side thereof, and the specific structure of the drop hammer impact test lifting device 100 refers to the above-mentioned embodiment. Since the drop hammer impact tester 1000 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. A plurality of drop hammer impact test lifting devices 100 are provided corresponding to a plurality of hanging parts 201 to lift and release the drop hammer 200. By providing a plurality of drop hammer impact test lifting devices 100 to lift the drop hammer 200, on the one hand, the stability of the lifting of the drop hammer 200 is guaranteed, and on the other hand, the load controllability of the lifting process of the drop hammer 200 is guaranteed, that is, the safety of use is guaranteed.

[0035] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lifting device for a drop weight impact test, characterized in that: include: A bracket, extending up and down, and arranged on one side of the drop weight; A bearing frame, which can be movably mounted on the bracket up and down; A driving device, disposed between the support and the bearing frame, for driving the bearing frame to move up and down on the support; The hanging structure comprises two hooks arranged at intervals, the two hooks are rotatably mounted on the carrier, the hook parts of the two hooks are located below the rotation axis thereof and are arranged opposite to each other, so that during the rotation process of the two hooks, there are an unlocking position in which the two hook parts are separated from each other and a hanging position in which the two hook parts are close to each other, and the two hook parts are used to hang below the hanging part of the drop hammer in the hanging position; An unlocking structure, mounted on the carrier, for driving the two hooks to move from the hanging position to the unlocking position to release the drop hammer; as well as, A protection device is installed on the support frame, and the protection device includes a protection pin which can be horizontally movably installed on the support frame. During the movable stroke of the protection pin, it has a protection position where it extends out of the end face of the support frame to extend into the pin hole of the drop hammer, and a release position where the support frame is retracted to disengage from the drop hammer.

2. The drop weight impact test lifting device according to claim 1, characterized in that: The driving device includes a driving member and a driving screw. The driving screw is extended up and down and is threadedly connected to the supporting frame. The driving member drives the driving screw to rotate to drive the supporting frame to move up and down.

3. The drop weight impact test lifting device according to claim 2, characterized in that: The driving screw rods and the driving member are both provided with two, and the two driving screw rods are located on both sides of the hanging structure.

4. The drop weight impact test lifting device according to claim 1, characterized in that: A first guiding slope is provided below the end of the hook portion of the hook, and the first guiding slope is used to abut against the hanging portion of the drop hammer when the carrier moves downward, so as to drive the two hooks to move from the hanging position to the unlocking position during the downward movement of the hook portion, so as to pass over the hanging portion of the drop hammer and be hung on the bottom of the hanging portion of the drop hammer.

5. The drop weight impact test lifting device according to claim 1, characterized in that: An unlocking portion is provided on the hook, and the unlocking portion is located on a side opposite to the two hooks. The unlocking structure includes an unlocking member that can be moved up and down, and the unlocking member is arranged corresponding to the unlocking portion. During the downward movement of the unlocking member, the unlocking member is abutted against the unlocking portion to drive the hook to move from the hanging position to the unlocking position.

6. The drop weight impact test lifting device according to claim 5, characterized in that: The unlocking portion is located on the side of the hook rotation axis in the horizontal direction.

7. The drop weight impact test lifting device according to claim 6, characterized in that: The unlocking portion is provided with a second guiding inclined surface, so that when the unlocking member is pressed against the second guiding inclined surface, the force direction thereof is toward the unlocking position of the hook.

8. The drop weight impact test lifting device according to claim 5, characterized in that: The unlocking structure further comprises a hydraulic rod and a lever structure, one end of the lever structure is hinged to the hydraulic rod, the other end of the lever structure is hinged to the unlocking member, and the hydraulic rod extends upward to drive the unlocking member to move downward; Wherein, the lever arm of the lever structure corresponding to the hydraulic rod is greater than the lever arm corresponding to the unlocking member.

9. The drop weight impact test lifting device according to claim 1, characterized in that: The protection device further comprises a gas pressure rod, and the gas pressure rod is connected to the protection pin via a transmission structure to drive the protection pin to move between the protection position and the release position.

10. A drop weight impact testing machine, characterized in that: include: A drop hammer, which has a plurality of hanging parts protruding from its side, and a plurality of groups of pin holes correspondingly arranged on its side; and, A plurality of drop-hammer impact test lifting devices, wherein the drop-hammer impact test lifting devices are the drop-hammer impact test lifting devices as described in any one of claims 1 to 9, and the plurality of drop-hammer impact test lifting devices are arranged corresponding to the plurality of hanging parts to lift and release the drop hammer.

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