CN213544992U - Crimping device for LCD glass - Google Patents

Abstract

The utility model relates to the technical field of automation, and discloses a crimping device for LCD glass, which comprises a crimping workbench and a crimping component; a first PCB and a second PCB which are horizontally arranged are arranged on the compression joint workbench, the first PCB and the second PCB are oppositely arranged, and detection stations for detecting the LCD glass are respectively arranged on the first PCB and the second PCB; when two ends of the LCD glass to be detected are respectively placed on the detection stations of the first PCB and the second PCB, the crimping component is used for applying pressure to the LCD glass. The application provides a pair of LCD glass's crimping device, simple structure applys pressure to LCD glass through adopting the crimping subassembly for contact resistance between the interface of LCD glass and PCB board keeps in invariable within range, thereby has improved the stability that LCD detected greatly, and automatic detection mode has also improved detection efficiency greatly moreover, has reduced the detection cost.

Description

Crimping device for LCD glass

Technical Field

The utility model relates to an automatic technical field especially relates to a crimping device of LCD glass.

Background

Before an LCD product leaves a factory, the electric performance of the LCD product needs to be detected, and the key of the electric performance detection is to connect an ITO pin of the LCD with a PCB loaded with a driving signal through a clamp so as to load a test signal into the LCD and detect the LCD. Since the LCD has small driving current, the impedance of the clamp crimping directly influences the result of the actual test.

In the prior art, when quality detection is carried out on LCD glass, generally, the LCD glass is crimped to an interface of a PCB (printed Circuit Board) by a manual mode through a clamp, the crimping force and the like are manually controlled, so that the contact impedance between the interfaces of the LCD glass and the PCB cannot be kept in a constant range, and in order to ensure the accuracy of a test result, different models of LCD products need to be tested by adopting customized clamps. The detection mode is complex, the stability is poor, the detection efficiency is low, and the test cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a LCD glass's crimping device aims at solving prior art, and the mode that LCD detected is complicated, poor stability, problem that detection efficiency is low moreover.

The utility model is realized in such a way, and provides a crimping device of LCD glass, which comprises a crimping worktable and a crimping component; a first PCB and a second PCB which are horizontally arranged are arranged on the crimping workbench, the first PCB and the second PCB are oppositely arranged, and detection stations for detecting the LCD glass are respectively arranged on the first PCB and the second PCB; when two ends of the LCD glass to be detected are respectively placed on the detection stations of the first PCB and the second PCB, the crimping component is used for applying pressure to the LCD glass so that the LCD glass is fixed on the detection stations of the first PCB and the second PCB and the two ends of the LCD glass are respectively electrically connected with the first PCB and the second PCB.

Furthermore, a distance adjusting component for driving the first PCB and the second PCB to approach and separate from each other is arranged on the crimping workbench.

Further, be provided with on the crimping workstation and be used for supplying first PCB board with second PCB board is in opposite directions or the guide rail of back-to-back motion, apart from the adjusting part including being used for driving first PCB board is in gliding first adjustment mechanism on the guide rail and being used for driving the second PCB board is in gliding second adjustment mechanism on the guide rail.

Furthermore, the first adjusting mechanism comprises a first screw rod and at least one first transmission block in threaded connection with the first screw rod, the first transmission block is arranged on the guide rail and is in sliding connection with the guide rail, the extending direction of the first screw rod is the same as the extending direction of the guide rail, and the first transmission block is fixedly connected with the first PCB; the second adjusting mechanism comprises a second screw rod and a second transmission block in threaded connection with the second screw rod, the second transmission block is arranged on the guide rail and in sliding connection with the guide rail, the extending direction of the second screw rod is the same as that of the guide rail, and the second transmission block is fixedly connected with the second PCB.

Further, the crimping assembly comprises a first crimping arm, a second crimping arm, a lifting frame, a transverse driving mechanism and a longitudinal driving mechanism, the first crimping arm and the second crimping arm are arranged on the lifting frame, the transverse driving mechanism is used for driving the first crimping arm and the second crimping arm to be close to and far away from each other on the lifting frame, and the longitudinal driving mechanism is used for driving the lifting frame to move upwards or downwards along the vertical direction.

Further, a transverse sliding rail used for enabling the first crimping arm and the second crimping arm to move in the opposite direction or move back to back is arranged on the lifting frame.

Further, the transverse driving mechanism comprises a first air cylinder, at least one first transverse sliding block, a second air cylinder and at least one second transverse sliding block; the first transverse sliding block is arranged on the transverse sliding rail and is connected with the transverse sliding rail in a sliding mode, the first compression joint arm is fixedly connected with the first transverse sliding block, one end of the first air cylinder is fixed on the lifting frame, and a piston rod of the first air cylinder is fixedly connected with the first compression joint arm, so that the first air cylinder can push the first compression joint arm to move along the extending direction of the transverse sliding rail; the second transverse sliding block is arranged on the transverse sliding rail and is in sliding connection with the transverse sliding rail, the second compression joint arm is fixedly connected with the second transverse sliding block, one end of the second air cylinder is fixed on the lifting frame, and a piston rod of the second air cylinder is fixedly connected with the second compression joint arm so that the second air cylinder can push the second compression joint arm to move along the extending direction of the transverse sliding rail.

Further, a longitudinal slide rail for enabling the lifting frame to move upwards or downwards along the vertical direction is arranged on the crimping workbench.

Further, the longitudinal driving mechanism comprises a third air cylinder and at least one longitudinal sliding block, the longitudinal sliding block is arranged on the longitudinal sliding rail and is in sliding connection with the longitudinal sliding rail, the lifting frame is fixedly connected with the longitudinal sliding block, one end of the third air cylinder is fixed on the lifting frame, and a piston rod of the third air cylinder is fixedly connected with the crimping workbench, so that the third air cylinder can push the lifting frame to move along the extending direction of the longitudinal sliding rail.

Furthermore, a height adjusting mechanism for adjusting the height of the lifting frame is further arranged on the crimping workbench; the height adjusting mechanism comprises a fixing seat, a screw rod and a limiting block, the fixing seat is fixed on the crimping workbench, a threaded through hole used for being connected with the screw rod in a threaded mode is formed in the fixing seat, the threaded through hole extends in the vertical direction, one end of the screw rod is embedded into the threaded through hole and stretches out, the top end of the stretching part is fixedly connected with the limiting block, and the limiting block is used for limiting the rising height of the lifting frame.

Compared with the prior art, the utility model discloses mainly there is following beneficial effect:

above-mentioned a pair of LCD glass's crimping device that provides, through set up first PCB board and second PCB board on the crimping workstation, when adopting above-mentioned crimping device to detect LCD glass, only need place LCD glass's both ends respectively on the detection station on first PCB board and the second PCB board, adopt the crimping subassembly again to exert pressure to LCD glass, thereby make ITO pin on the LCD glass can be connected with the pin interface electricity on first PCB board and the second PCB board respectively, so that detect LCD's electrical property. Above-mentioned crimping device simple structure applys pressure to LCD glass through adopting the crimping subassembly for the contact impedance between the interface of LCD glass and PCB board keeps in invariable within range, thereby has improved the stability that LCD detected greatly, and automatic detection mode has also improved detection efficiency greatly moreover, has reduced the detection cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an apparatus for pressing and bonding LCD glass according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a press-bonding workbench in a press-bonding device for LCD glass according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a distance adjusting assembly in a crimping apparatus for LCD glass according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a crimping assembly in a crimping apparatus for LCD glass according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first crimping arm in a crimping device for LCD glass according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a height adjusting mechanism in a crimping apparatus for LCD glass according to an embodiment of the present invention.

Reference numerals: 1-a crimping workbench, 2-a crimping component, 3-a distance adjusting component, 4-a height adjusting mechanism, 11-a first PCB, 12-a second PCB, 21-a first crimping arm, 22-a second crimping arm, 23-a lifting frame, 31-a first adjusting mechanism, 32-a second adjusting mechanism, 41-a fixed seat, 42-a screw rod, 43-a limiting block, 241-a first cylinder, 242-a first transverse sliding block, 243-a second cylinder, 244-a second transverse sliding block, 251-a third cylinder, 252-a longitudinal sliding block, 311-a first screw rod, 312-a first transmission block, 321-a second screw rod and 322-a second transmission block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an LCD glass crimping apparatus provided in the present invention, and referring to fig. 2 and fig. 4, the LCD glass crimping apparatus provided in the present embodiment includes a crimping table 1 and a crimping assembly 2; a first PCB 11 and a second PCB 12 which are horizontally arranged are arranged on the compression joint workbench 1, the first PCB 11 and the second PCB 12 are oppositely arranged, and detection stations for detecting the LCD glass are respectively arranged on the first PCB 11 and the second PCB 12; when the two ends of the LCD glass to be detected are respectively placed on the detection stations of the first PCB 11 and the second PCB 12, the crimping component 2 is used for applying pressure to the LCD glass so that the LCD glass is fixed on the detection stations of the first PCB 11 and the second PCB 12, and the two ends of the LCD glass are respectively electrically connected with the first PCB 11 and the second PCB 12.

Above-mentioned a pair of LCD glass's crimping device that provides, through set up first PCB board 11 and second PCB board 12 on crimping workstation 1, when adopting above-mentioned crimping device to detect LCD glass, only need place LCD glass's both ends respectively on first PCB board 11 and on the detection station on the second PCB board 12, adopt crimping subassembly 2 again to exert pressure to LCD glass, thereby make ITO pin on the LCD glass can be connected with the pin interface electricity on first PCB board 11 and the second PCB board 12 respectively, so that detect LCD's electrical property. Above-mentioned crimping device simple structure through adopting crimping subassembly 2 to exert pressure to LCD glass for the contact impedance between the interface of LCD glass and PCB board keeps in invariable within range, thereby has improved the stability that LCD detected greatly, and automatic detection mode has also improved detection efficiency greatly moreover, has reduced the detection cost.

According to the type and the size of the LCD glass to be detected, the first PCB 11 and the second PCB 12 can be replaced and used for being electrically connected with the LCD glass.

As an embodiment of the present invention, the distance adjusting assembly 3 is provided on the pressing workbench 1 for driving the first PCB 11 and the second PCB 12 to be close to and away from each other. In order to detect the LCD glass with different models and sizes, the distance between the first PCB 11 and the second PCB 12 needs to be adjusted, so that ITO lead pins on the LCD glass to be detected can be just electrically connected with pin interfaces on the first PCB 11 and the second PCB 12; through adopting the position of adjusting first PCB board 11 and second PCB board 12 apart from adjusting part 3 to realized the generalized adaptation to the LCD product of equidimension not, when promoting the stability that detects, also greatly reduced the cost that the LCD detected.

In the present embodiment, referring to fig. 2 and fig. 3, a guide rail for allowing the first PCB 11 and the second PCB 12 to move towards or away from each other is disposed on the pressing workbench 1, and the distance adjusting assembly 3 includes a first adjusting mechanism 31 for driving the first PCB 11 to slide on the guide rail and a second adjusting mechanism 32 for driving the second PCB 12 to slide on the guide rail. The first adjusting mechanism 31 can drive the first PCB 11 to slide on the guide rail, and the second adjusting mechanism 32 can drive the second PCB 12 to slide on the guide rail.

Specifically, the first adjusting mechanism 31 includes a first screw 311 and at least one first transmission block 312 in threaded connection with the first screw 311, the first transmission block 312 is disposed on the guide rail and slidably connected with the guide rail, the extending direction of the first screw 311 is the same as the extending direction of the guide rail, and the first transmission block 312 is fixedly connected with the first PCB 11; the fixed cover of one end of first lead screw 311 is equipped with first adjusting nut, and the in-process of regulation, through manual rotation first adjusting nut for first lead screw 311 rotates, and first lead screw 311 rotates and can drives first transmission piece 312 along the direction motion that first lead screw 311 extends, and the motion of first transmission piece 312 can drive first PCB board 11 and slide on the guide rail. Of course, the first lead screw 311 may be driven by a motor to rotate, so as to drive the first PCB 11 to slide on the guide rail.

Specifically, the second adjusting mechanism 32 includes a second screw rod 321 and a second transmission block 322 in threaded connection with the second screw rod 321, the second transmission block 322 is disposed on the guide rail and slidably connected with the guide rail, the extending direction of the second screw rod 321 is the same as the extending direction of the guide rail, and the second transmission block 322 is fixedly connected with the second PCB 12; the fixed cover of one end of second lead screw 321 is equipped with second adjusting nut, and the in-process of regulation, through manual rotation second adjusting nut for second lead screw 321 rotates, and second lead screw 321 rotates and can drives second transmission piece 322 along the direction motion that second lead screw 321 extends, and the motion of second transmission piece 322 can drive second PCB board 12 and slide on the guide rail. Of course, the second lead screw 321 can be driven by the motor to slide on the guide rail, which is not limited by the present invention.

As an embodiment of the present invention, referring to fig. 1, fig. 2 and fig. 4, the crimping assembly 2 includes the first crimping arm 21, the second crimping arm 22, the crane 23, the horizontal driving mechanism and the vertical driving mechanism, the first crimping arm 21 and the second crimping arm 22 are disposed on the crane 23, the horizontal driving mechanism is used for driving the first crimping arm 21 and the second crimping arm 22 to be close to and keep away from each other on the crane 23, and the vertical driving mechanism is used for driving the crane 23 to move upwards or downwards along the vertical direction.

Wherein, at the in-process of crimping, LCD glass is located the below of first crimping arm 21 and second crimping arm 22, and vertical actuating mechanism can drive first crimping arm 21 and second crimping arm 22 together along vertical direction upward or downstream through crane 23 to be convenient for first crimping arm 21 and second crimping arm 22 exert decurrent pressure to LCD glass, so that LCD glass fixes on first PCB board 11 and on the detection station on second PCB board 12. In order to detect LCD glass of different models and sizes, the distance between the first pressing arm 21 and the second pressing arm 22 needs to be adjusted so as to apply downward pressure on the LCD glass; the positions of the first crimping arm 21 and the second crimping arm 22 are adjusted by adopting the transverse driving mechanism, so that the universal adaptation of LCD products with different sizes is realized, and the cost of LCD detection is greatly reduced while the stability of detection is improved.

Preferably, in order to ensure that the LCD glass is not damaged during the compression joint, a layer of acrylic adhesive is arranged on the lower surfaces of the first compression joint arm 21 and the second compression joint arm 22, and the acrylic adhesive has the advantages of good strength, small compression deformation and the like.

In this embodiment, the crane 23 is provided with a transverse slide rail for allowing the first crimp arm 21 and the second crimp arm 22 to move towards or away from each other. Wherein, the horizontal slide rail extends along the horizontal direction. In order to keep the first and second crimping arms 21 and 22 stable during movement, the lateral sliding rail may be provided in a plurality of pieces.

Specifically, referring to fig. 4 and 5, the lateral driving mechanism includes a first air cylinder 241, at least one first lateral slider 242, a second air cylinder 243, and at least one second lateral slider 244; the first transverse sliding block 242 is arranged on the transverse sliding rail and is connected with the transverse sliding rail in a sliding mode, the first pressure connecting arm 21 is fixedly connected with the first transverse sliding block 242, one end of the first air cylinder 241 is fixed on the lifting frame 23, and a piston rod of the first air cylinder 241 is fixedly connected with the first pressure connecting arm 21, so that the first air cylinder 241 can push the first pressure connecting arm 21 to move along the extending direction of the transverse sliding rail; the second transverse sliding block 244 is arranged on the transverse sliding rail and is connected with the transverse sliding rail in a sliding mode, the second compression joint arm 22 is fixedly connected with the second transverse sliding block 244, one end of the second air cylinder 243 is fixed on the lifting frame 23, and a piston rod of the second air cylinder 243 is fixedly connected with the second compression joint arm 22, so that the second air cylinder 243 can push the second compression joint arm 22 to move along the extending direction of the transverse sliding rail. Here, the first and second lateral sliders 242 and 244 may be provided in plurality for stability of the first and second crimp arms 21 and 22 during movement.

In the present embodiment, the crimping table 1 is provided with a longitudinal slide rail for moving the crane 23 upward or downward in the vertical direction. Wherein the longitudinal slide extends in a vertical direction. In order to keep the crane 23 stable during movement, the longitudinal slide rail can be provided in a plurality of strips.

Specifically, the longitudinal driving mechanism comprises a third air cylinder 251 and at least one longitudinal sliding block 252, the longitudinal sliding block 252 is arranged on the longitudinal sliding rail and is in sliding connection with the longitudinal sliding rail, the lifting frame 23 is fixedly connected with the longitudinal sliding block 252, one end of the third air cylinder 251 is fixed on the lifting frame 23, and a piston rod of the third air cylinder 251 is fixedly connected with the crimping worktable 1, so that the third air cylinder 251 can push the lifting frame 23 to move along the extending direction of the longitudinal sliding rail. Wherein, the lifting frame 23 can move upwards or downwards along the vertical direction under the pushing of the third air cylinder 251, and the first pressure welding arm 21 and the second pressure welding arm 22 on the lifting frame 23 can move together with the lifting frame 23. In order to stabilize the lifting frame 23 during movement, the longitudinal slide block 252 can be provided in plurality.

As an embodiment of the present invention, referring to fig. 1 and 6, a height adjusting mechanism 4 for adjusting the height of the lifting frame 23 is further disposed on the crimping table 1; the height adjusting mechanism 4 comprises a fixed seat 41, a screw rod 42 and a limiting block 43, the fixed seat 41 is fixed on the crimping workbench 1, a threaded through hole and a threaded through hole which are used for being in threaded connection with the screw rod 42 are formed in the fixed seat 41, one end of the screw rod 42 is embedded into the threaded through hole and extends out along the vertical direction, the top end of the extending part is fixedly connected with the limiting block 43, and the limiting block 43 is used for limiting the rising height of the lifting frame 23. In the process that the vertical driving mechanism drives the lifting frame 23 to move along the vertical direction, the height adjusting mechanism 4 can limit the moving height of the lifting frame 23, so that the LCD glass with different specifications can be detected conveniently.

Wherein, be provided with the diaphragm on the crane 23, when vertical actuating mechanism drove crane 23 along vertical direction upward movement to the bottom butt of diaphragm and stopper 43, crane 23 just can be under the restriction of stopper 43, can't continue the upward movement. The screw rod 42 is pushed manually to move upwards or downwards along the thread through hole, so that the limiting block 43 can be driven to move upwards or downwards together, and the movement height of the lifting frame 23 can be adjusted indirectly.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The crimping device for the LCD glass is characterized by comprising a crimping workbench and a crimping assembly; a first PCB and a second PCB which are horizontally arranged are arranged on the crimping workbench, the first PCB and the second PCB are oppositely arranged, and detection stations for detecting the LCD glass are respectively arranged on the first PCB and the second PCB; when two ends of the LCD glass to be detected are respectively placed on the detection stations of the first PCB and the second PCB, the crimping component is used for applying pressure to the LCD glass so that the LCD glass is fixed on the detection stations of the first PCB and the second PCB and the two ends of the LCD glass are respectively electrically connected with the first PCB and the second PCB.

2. The LCD glass crimping device of claim 1, wherein a distance adjusting assembly is disposed on the crimping worktable for driving the first PCB and the second PCB to move toward and away from each other.

3. The crimping device for the LCD glass according to claim 2, wherein a guide rail for the first PCB and the second PCB to move towards or away from each other is disposed on the crimping worktable, and the distance adjusting assembly comprises a first adjusting mechanism for driving the first PCB to slide on the guide rail and a second adjusting mechanism for driving the second PCB to slide on the guide rail.

4. The crimping device of LCD glass according to claim 3, wherein the first adjusting mechanism comprises a first screw rod and at least one first transmission block screwed with the first screw rod, the first transmission block is arranged on the guide rail and is connected with the guide rail in a sliding manner, the extending direction of the first screw rod is the same as the extending direction of the guide rail, and the first transmission block is fixedly connected with the first PCB; the second adjusting mechanism comprises a second screw rod and a second transmission block in threaded connection with the second screw rod, the second transmission block is arranged on the guide rail and in sliding connection with the guide rail, the extending direction of the second screw rod is the same as that of the guide rail, and the second transmission block is fixedly connected with the second PCB.

5. The LCD glass crimping device of claim 1, wherein the crimping assembly comprises a first crimping arm, a second crimping arm, a lifting frame, a transverse driving mechanism and a longitudinal driving mechanism, the first crimping arm and the second crimping arm are arranged on the lifting frame, the transverse driving mechanism is used for driving the first crimping arm and the second crimping arm to get close to and get away from each other on the lifting frame, and the longitudinal driving mechanism is used for driving the lifting frame to move upwards or downwards along a vertical direction.

6. The LCD glass crimping device of claim 5, wherein the lifting frame is provided with a transverse slide rail for enabling the first crimping arm and the second crimping arm to move towards or away from each other.

7. The crimping device of LCD glass of claim 6, wherein the lateral drive mechanism comprises a first air cylinder, at least one first lateral slide, a second air cylinder, and at least one second lateral slide; the first transverse sliding block is arranged on the transverse sliding rail and is connected with the transverse sliding rail in a sliding mode, the first compression joint arm is fixedly connected with the first transverse sliding block, one end of the first air cylinder is fixed on the lifting frame, and a piston rod of the first air cylinder is fixedly connected with the first compression joint arm, so that the first air cylinder can push the first compression joint arm to move along the extending direction of the transverse sliding rail; the second transverse sliding block is arranged on the transverse sliding rail and is in sliding connection with the transverse sliding rail, the second compression joint arm is fixedly connected with the second transverse sliding block, one end of the second air cylinder is fixed on the lifting frame, and a piston rod of the second air cylinder is fixedly connected with the second compression joint arm so that the second air cylinder can push the second compression joint arm to move along the extending direction of the transverse sliding rail.

8. The LCD glass crimping device of claim 5, wherein the crimping workbench is provided with a longitudinal slide rail for the crane to move up or down along a vertical direction.

9. The crimping device of LCD glass according to claim 8, wherein the longitudinal driving mechanism comprises a third cylinder and at least one longitudinal slider, the longitudinal slider is disposed on the longitudinal slide rail and slidably connected with the longitudinal slide rail, the lifting frame is fixedly connected with the longitudinal slider, one end of the third cylinder is fixed on the lifting frame, and a piston rod of the third cylinder is fixedly connected with the crimping worktable, so that the lifting frame can be pushed by the third cylinder to move along the extending direction of the longitudinal slide rail.

10. The LCD glass crimping device of any one of claims 5 to 9, wherein a height adjusting mechanism for adjusting the height of the lifting frame is further arranged on the crimping workbench; the height adjusting mechanism comprises a fixing seat, a screw rod and a limiting block, the fixing seat is fixed on the crimping workbench, a threaded through hole used for being connected with the screw rod in a threaded mode is formed in the fixing seat, the threaded through hole extends in the vertical direction, one end of the screw rod is embedded into the threaded through hole and stretches out, the top end of the stretching part is fixedly connected with the limiting block, and the limiting block is used for limiting the rising height of the lifting frame.

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