Plate clamping mechanism of aluminum plate stretcher and push rod adjusting method of plate clamping mechanism

Abstract

The invention relates to a plate clamping mechanism of an aluminum plate stretcher and a push rod adjusting method of the plate clamping mechanism, and belongs to the technical field of plate stretchers. The clamping mechanism comprises a clamp and an end push rod, and the clamp and the end push rod are installed on a stretching head in a sliding mode; the end push rod is connected with the middle push rod through a first connecting part; the synchronous beam is slidably mounted on the mounting frame, the middle push rod is slidably mounted on the synchronous beam, the synchronous beam is provided with a mounting block, the mounting block is provided with a containing cavity, and the upper end and the lower end of the containing cavity penetrate through to form openings; the pre-tightening hydraulic cylinder is mounted on the mounting frame, and a piston rod of the pre-tightening hydraulic cylinder is connected with the synchronous beam through a second connecting part; the clamping hydraulic cylinder is mounted on the mounting block, a piston rod of the clamping hydraulic cylinder is connected with the middle push rod through a third connecting part, and the third connecting part is arranged in the containing cavity; the adjusting base plate is connected to the mounting block, and the adjusting base plate is mounted between the third connecting part and the inner wall of the accommodating cavity. According to the method, the initial position of the end push rod is changed by replacing the adjusting base plates with different thicknesses.

Description

Technical Field

[0001] The invention belongs to the technical field of plate stretching machines, and in particular relates to a plate clamping mechanism of an aluminum plate stretching machine and a push rod adjustment method thereof. Background Art

[0002] The current aluminum plate stretching machine is usually equipped with a plate clamping mechanism, which includes two stretching heads, with a jaw between the two stretching heads, and a clamp located in the jaw is slidably installed on each stretching head. The clamp is pushed forward by the end push rod and moves forward on the stretching head. When the clamp moves forward, the clamps on the two stretching heads are close to achieve clamping. Each stretching head is also provided with a wire rope and a hydraulic cylinder for driving the wire rope to move. The clamp on the stretching head is connected to the wire rope. When the clamped aluminum plate needs to be loosened, the end push rod is first driven to move backward, and then the hydraulic cylinder is started to pull the wire rope. The wire rope is used to pull the clamp backward to separate the clamps on the two stretching heads. In order to make the end push rod move smoothly, a slide is provided in the stretching head, and the end push rod is slidably inserted in the slide.

[0003] One end of the end push rod is close to the clamp, and the other end is connected to one end of the middle push rod through the first connection part. This type of plate clamping mechanism also includes a synchronous beam that can slide in the mounting frame, a connecting block is provided at the rear end of the synchronous beam, and a pre-tightening hydraulic cylinder is installed on the mounting frame. The piston rod of the pre-tightening hydraulic cylinder is connected to the connecting block through the second connection part, so that the pre-tightening hydraulic cylinder is used to push the entire synchronous beam forward or backward. A channel is provided in the synchronous beam, and the middle push rod is slidably inserted in the above channel. A clamping hydraulic cylinder is installed on the synchronous beam, and the piston rod of the clamping hydraulic cylinder is connected to the other end of the middle push rod through the third connection part. In this way, the clamping hydraulic cylinder can push the middle push rod to drive the end push rod to move forward or backward.

[0004] Usually, the plate clamping mechanism of an aluminum plate stretching machine is equipped with multiple clamps, and correspondingly, multiple end push rods and middle push rods are also configured. In order to ensure that each clamp can apply uniform pressure on the surface of the aluminum plate, in an ideal state, the front ends of the multiple end push rods are flush. When the clamping hydraulic cylinder runs the same stroke / time, the multiple end push rods simultaneously push the corresponding clamps to act on different positions on the surface of the aluminum plate, thereby applying uniform clamping force on the aluminum plate. However, in actual use, because the front end of the end push rod is in natural contact with the clamp, and the sliding of the clamp on the stretching head is along an oblique line, which has an angle with the axis of the end push rod, when the end push rod pushes the clamp to move forward, there will be relative sliding between the front end of the end push rod and the clamp. During long-term use, the above relative sliding will cause the front end of the end push rod to wear, resulting in different lengths of multiple end push rods. Moreover, there are tolerances in the manufacture of the end push rods, resulting in different lengths. In this way, when the longer end push rod has pushed the corresponding clamp to clamp the aluminum plate, the clamp corresponding to the shorter end push rod has not yet clamped the aluminum plate. Even if all the clamps can be pushed to completely clamp the aluminum plate in the end, different parts of the aluminum plate are clamped at different times, which will produce different clamping pressures on the surface of the aluminum plate and affect the stretching.

[0005] Currently, when the front end of the end push rod is severely worn, the end push rod can only be replaced. However, the replacement of the end push rod is very troublesome and time-consuming. The machine must be shut down during the replacement of the end push rod, and the long shutdown reduces production efficiency. Summary of the invention

[0006] The invention provides a plate clamping mechanism of an aluminum plate stretching machine and a push rod adjustment method thereof, which are used to solve the technical problem.

[0007] The present invention is implemented by the following technical scheme: a plate clamping mechanism of an aluminum plate stretching machine, comprising:

[0008] A clamp and an end push rod for pushing the clamp, wherein the clamp and the end push rod are both slidably mounted on the stretching head;

[0009] An intermediate push rod, the end push rod being connected to the intermediate push rod through a first connecting portion;

[0010] A synchronous beam is slidably mounted on the mounting frame, the intermediate push rod is slidably mounted on the synchronous beam, a mounting block is provided at the rear end of the synchronous beam, the mounting block is provided with a receiving cavity, and both upper and lower ends of the receiving cavity are penetrated to form openings;

[0011] A pre-tightening hydraulic cylinder is mounted on the mounting frame, and a piston rod of the pre-tightening hydraulic cylinder is connected to the synchronous beam via a second connecting portion;

[0012] A clamping hydraulic cylinder is mounted on the mounting block, and a piston rod of the clamping hydraulic cylinder is connected to the intermediate push rod through a third connecting portion, wherein the third connecting portion is placed in the accommodating cavity;

[0013] An adjusting pad is detachably connected to the mounting block, and the adjusting pad is cushioned between the third connecting portion and the inner wall of the accommodating cavity.

[0014] Further, in order to better implement the present invention, the mounting block includes:

[0015] A main block is fixedly arranged at the rear end of the synchronous beam, and the main block is provided with a through opening penetrating through the upper end, the lower end and the rear end thereof;

[0016] A mounting plate, bolted and fixed to the rear end of the main block and blocking the through opening from the rear end, the accommodating cavity is formed between the mounting plate and the main block, the adjusting pad and the clamping hydraulic cylinder are bolted and fixed to the mounting plate;

[0017] The step plate, the mounting plate is provided with a step through hole, the step plate is bolted and fixed in the step through hole, the step plate is provided with a through hole, the piston rod of the clamping hydraulic cylinder is slidably connected to the through hole, and the outer diameter of the third connecting part is larger than the aperture of the through hole and smaller than the aperture of the step through hole.

[0018] Further, in order to better implement the present invention, the third connecting portion includes:

[0019] A sleeve, in which the rear end of the intermediate push rod and the front end of the piston rod of the clamping hydraulic cylinder are both inserted;

[0020] A first bolt, a first screw hole is formed on the wall of the sleeve, a first countersunk hole is formed on the intermediate push rod, and the first bolt is screwed into the first screw hole and inserted into the first countersunk hole;

[0021] A second bolt, a second screw hole is opened on the tube wall of the sleeve, a second countersunk hole is opened on the piston rod of the clamping hydraulic cylinder, and the second bolt is screwed into the second screw hole and inserted into the second countersunk hole.

[0022] Further, in order to better implement the present invention, the sleeve includes:

[0023] A straight tube, wherein the first screw hole and the second screw hole are both opened in the tube wall of the straight tube, two baffles facing each other are convexly provided on the inner wall at the rear end of the straight tube, an insertion port is formed between the two baffles, and the front end of the piston rod of the clamping hydraulic cylinder is provided with two baffles facing each other to form a T-shaped head, the T-shaped head is inserted into the straight tube from the insertion port, and when the straight tube is rotated 90°, the baffles are in contact with the baffles;

[0024] Two semicircular plates, a circular groove near the rear end of the middle push rod is provided on the circumferential side wall of the middle push rod, the two semicircular plates are both clamped in the circular groove, and the two semicircular plates are joined together to form a full circular plate;

[0025] Connecting bolts, each of the semicircular plates is bolted and fixed to the front end of the straight pipe through a connecting bolt.

[0026] Furthermore, in order to better realize the present invention, the first connecting part includes a first chain plate and two first locking pins, the rear end of the end push rod is connected to the first chain plate through one of the first locking pins, and the front end of the middle push rod is connected to the first chain plate through another first locking pin.

[0027] Further, in order to better implement the present invention, the first chain plate is provided with a first hinge hole and a second hinge hole;

[0028] A plug block is fixedly provided at the rear end of the end push rod, and a first pin hole corresponding to the first hinge hole is opened on the plug block. A butt joint is fixedly provided at the middle part of the front end of the intermediate push rod, and a second pin hole corresponding to the second hinge hole is opened on the butt joint, wherein one of the first locking pins is inserted into the first hinge hole and the first pin hole, and another of the first locking pins is inserted into the second hinge hole and the second pin hole, wherein the first hinge hole is a waist-shaped hole, and the butt joint abuts against the plug block.

[0029] Furthermore, in order to better implement the present invention, the number of the first chain plates is two, and the two first chain plates are stacked on both sides of the abutment joint, and the abutment joint, the first chain plates and the first locking pin constitute a head assembly, and the outer diameter of the head assembly is smaller than the intermediate push rod.

[0030] Furthermore, in order to better realize the present invention, the second connecting part includes a second chain plate and two second locking pins, and a connecting rod is also fixed to the rear end of the synchronous beam. The connecting rod is connected to the second chain plate through one of the second locking pins, and the piston rod of the pre-tightening hydraulic cylinder is connected to the second chain plate through another second locking pin.

[0031] Further, in order to better implement the present invention, the second chain plate is provided with a third hinge hole and a fourth hinge hole;

[0032] The connecting rod is provided with a third pin hole corresponding to the third hinge hole, and the piston rod of the pre-tightening hydraulic cylinder is provided with a fourth pin hole corresponding to the fourth hinge hole, wherein one of the second locking pins is inserted into the third hinge hole and the third pin hole, and another of the second locking pins is inserted into the fourth hinge hole and the fourth pin hole, wherein the fourth hinge hole is a waist-shaped hole, and the piston rod of the pre-tightening hydraulic cylinder is in contact with the connecting rod.

[0033] The push rod adjustment method provided by the present invention is used for adjusting the position of the end push rod of the above-mentioned plate clamping mechanism, comprising:

[0034] Step 1: Take a piece of plate and place it between the clamps so that the plate covers all the clamps;

[0035] Step 2: Start the pre-tightening hydraulic cylinder, push the synchronous beam to drive the middle push rod and the end push rod to move forward synchronously, so that the clamp initially clamps the plate until the synchronous beam can no longer move forward, and then the pre-tightening hydraulic cylinder maintains pressure;

[0036] Step 3: Start the clamping hydraulic cylinder, push the middle push rod and the end push rod to move forward synchronously again, so that all clamps further clamp the plate, and then make the clamping hydraulic cylinder maintain pressure;

[0037] Step 4: measuring the distances between all the third connecting parts and the corresponding adjustment pads from the opening of the mounting block (that is, the opening of the accommodating cavity) to obtain measurement results;

[0038] Step 5: According to the measurement results, replace the adjustment pads with different thicknesses so that the spacing between all the third connecting parts and the corresponding adjustment pads is the same, so that the front ends of all the end push rods are flush.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The plate clamping mechanism of the aluminum plate stretching machine provided by the present invention comprises a stretching head, a clamp, an end push rod, an intermediate push rod, a synchronous beam, a mounting frame, a pre-tightening hydraulic cylinder, a clamping hydraulic cylinder and an adjusting pad. The clamp and the end push rod are both slidably mounted on the stretching head. The end push rod is used to push the clamp, and the end push rod is connected to the intermediate push rod through a first connecting portion, the intermediate push rod is slidably mounted on the synchronous beam, and the synchronous beam is slidably mounted on the mounting frame. The pre-tightening hydraulic cylinder is mounted on the mounting frame, and the piston rod of the pre-tightening hydraulic cylinder is connected to the synchronous beam through a second connecting portion. In this way, when the pre-tightening hydraulic cylinder is in operation, it can move forward or backward on the mounting frame through the synchronous beam, thereby driving the intermediate push rod and the end push rod to move forward and backward. A mounting block is also provided at the rear end of the synchronous beam. The clamping hydraulic cylinder is installed on the mounting block, and a accommodating cavity is provided on the mounting block. The upper and lower ends of the accommodating cavity are penetrated to form openings. The clamping The piston rod of the hydraulic cylinder is connected to the above-mentioned intermediate push rod through a third connecting part, and the third connecting part is placed in the above-mentioned accommodating chamber. In this way, the clamping hydraulic cylinder can push the intermediate push rod to move forward or backward on the synchronous beam, and then push the end push rod to move forward or backward. At the same time, it will also push the above-mentioned third connecting part to move forward or backward in the above-mentioned accommodating chamber. The adjusting pad is detachably connected to the above-mentioned mounting block, and the adjusting pad is padded between the third connecting part and the inner wall of the accommodating chamber. When the clamping hydraulic cylinder drives the third connecting part and the intermediate push rod and the end push rod to move backward to the extreme point (that is, the clamping hydraulic cylinder drives the end push rod to release the clamp), the third connecting part is against the above-mentioned adjusting pad. When the clamping hydraulic cylinder drives the third connecting part and the intermediate push rod and the end push rod to move forward to the extreme point (that is, the clamping hydraulic cylinder drives the end push rod to press the clamp), the third connecting part is separated from the above-mentioned adjusting pad. Of course, the number of the above-mentioned clamps, end push rods, intermediate push rods and clamping hydraulic cylinders are multiple and one-to-one corresponding.

[0041] When the plate clamping mechanism of the aluminum plate stretching machine is used to clamp the aluminum plate, the pre-tightening hydraulic cylinder is first started, so that the synchronous beam drives the middle push rod and the end push rod to move forward together, and the middle push rod moving forward pushes the corresponding clamp forward, so that the clamp acts on the surface of the aluminum plate until the synchronous beam can no longer move forward. At this time, the clamp is initially clamped on the surface of the aluminum plate, and then the pre-tightening hydraulic cylinder is pressed, and then the clamping hydraulic cylinder is started again, so that the middle push rod and the end push rod are thrusted forward, and the end push rod exerts thrust on the corresponding clamp, so that the clamp further clamps the aluminum plate. If the front end of a certain end push rod is worn and the length of the end push rod is less than that of the other end push rods, then when it is retracted into place, the front end of the end push rod cannot be flush with the other end push rods. At this time, the adjustment pad corresponding to the shorter end push rod is replaced with a thicker plate, so that the front ends of all end push rods are flush when they are retracted into place.

[0042] Through the above structure, when the front end of an end push rod of the aluminum plate stretching machine provided by the present invention is worn, it is not necessary to replace the end push rod, but the corresponding adjustment pad can be replaced with a thicker plate. Moreover, because the upper and lower ends of the accommodating cavity are penetrated to form openings, the staff can conveniently disassemble and assemble the adjustment pad from the above openings. Therefore, compared with the prior art, the plate clamping mechanism of the aluminum plate stretching machine can adjust the starting position of the worn end push rod more quickly, so that the front ends of all the end push rods are flush, which saves time and effort, shortens the idle time of equipment, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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 these drawings without paying creative work.

[0044] Figure 1 It is a schematic diagram of the main structure of the plate clamping mechanism of the aluminum plate stretching machine provided by an embodiment of the present invention;

[0045] Figure 2 yes Figure 1 A local enlarged view of area A;

[0046] Figure 3 yes Figure 2 A local enlarged view of area B in FIG.

[0047] Figure 4 yes Figure 2 A local enlarged view of the C region;

[0048] Figure 5 1 is a schematic diagram of a plan view of a plate clamping mechanism of an aluminum plate stretching machine provided in an embodiment of the present invention (the stretching head and the clamp are not shown);

[0049] Figure 6 yes Figure 5 A local enlarged view of the D region;

[0050] Figure 7 yes Figure 5 A local enlarged view of the E region;

[0051] Figure 8 Schematic diagram of the installation structure of the clamping hydraulic cylinder and the pre-tightening hydraulic cylinder on the synchronous beam in the embodiment of the present invention;

[0052] Fig. 9 is a schematic structural diagram of the third connecting portion in an embodiment of the present invention (the first bolt and the second bolt are not shown);

[0053] Fig.10 yes Fig. 9 Exploded view of the structure shown.

[0054] In the figure:

[0055] 1-stretching head, 2-clamp, 3-end push rod, 31-insert block, 4-middle push rod, 41-annular groove, 42-butt joint, 5-first connecting part, 51-first chain plate, 52-first locking pin, 6-synchronous beam, 61-connecting rod, 7-mounting frame, 8-mounting block, 81-accommodating chamber, 82-main block, 83-mounting plate, 84-step plate, 9-pre-tightening hydraulic cylinder, 10-second connecting part, 101-second chain plate, 102-second locking pin, 11-clamping hydraulic cylinder, 111-T-shaped head, 12-third connecting part, 121-straight pipe, 122-baffle, 123-semicircular plate, 124-first bolt, 125-second bolt, 126-connecting bolt, 13-adjusting pad. DETAILED DESCRIPTION

[0056] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0057] It is worth noting that the concepts of front, back, top, and bottom in this embodiment are as follows: Figure 1 The concepts of front, back, top, and bottom shown in the figure shall prevail. Specifically, Figure 1 The left side shown in the figure is the front, Figure 1 The right side shown in the figure is the rear. Figure 1 The upper side shown in the figure is the upper side. Figure 1 The lower part shown in is lower.

[0058] Embodiment 1:

[0059] like Figure 1-Figure 10 As shown, the plate clamping mechanism of the aluminum plate stretching machine provided in this embodiment includes a stretching head 1, a clamp 2, an end push rod 3, an intermediate push rod 4, a synchronous beam 6, a mounting frame 7, a pre-tightening hydraulic cylinder 9, a clamping hydraulic cylinder 11 and an adjusting pad 13, wherein:

[0060] The clamp 2 and the end push rod 3 are both slidably mounted on the stretching head 1. It should be noted that there are two stretching heads 1, and a jaw for clamping the aluminum plate is formed between the two stretching heads 1. Each stretching head 1 is provided with a plurality of inclined guide rails, and a clamp 2 is slidably mounted on each guide rail, and each clamp 2 corresponds to an end push rod 3. The above-mentioned end push rod 3 is used to push the clamp 2 so that the clamp 2 moves forward. When the clamp 2 moves forward, the clamps 2 on the two stretching heads 1 move together to clamp the aluminum plate located therebetween. This embodiment is described by taking an end push rod 3, an intermediate push rod 4, a clamping hydraulic cylinder 11, and an adjusting pad 13 corresponding to one clamp 2 as an example. In fact, the connection relationship and position relationship of the end push rods 3, the intermediate push rods 4, the clamping hydraulic cylinder 11, and the adjusting pad 13 corresponding to all the clamps 2 are the same. The above-mentioned end push rod 3 is connected to the above-mentioned intermediate push rod 4 through the first connecting portion 5. The stretching head 1 is also provided with a slideway, and the end push rod 3 is slidably inserted into the slideway, so that the end push rod 3 can move forward and backward more smoothly. As in the prior art, the stretching head 1 is also provided with a hydraulic cylinder for driving the steel wire rope to move, and the steel wire rope is connected to the clamp 2. When the clamped aluminum plate needs to be released, the hydraulic cylinder is operated to pull the steel wire rope, and then the clamp 2 is dragged backward by the steel wire rope.

[0061] The middle push rod 4 is slidably mounted on the synchronous beam 6. Specifically, a channel is provided in the synchronous beam 6, a wear-resistant copper sleeve is installed in the channel, and the middle push rod 4 is slidably inserted in the wear-resistant copper sleeve. The synchronous beam 6 is slidably mounted on the mounting frame 7. As in the prior art, a slide plate is provided on the mounting frame 7, and a copper slider is provided on the outer wall of the synchronous beam 6. The copper slider is slidably mounted on the slide plate, so that the synchronous beam 6 is slidably mounted on the mounting frame 7.

[0062] The above-mentioned pre-tightening hydraulic cylinder 9 is installed on the mounting frame 7, and the piston rod of the pre-tightening hydraulic cylinder 9 is connected to the synchronous beam 6 through the second connecting part 10. In this way, when the pre-tightening hydraulic cylinder 9 is in operation, it can move forward or backward on the mounting frame 7 through the synchronous beam 6, thereby driving the middle push rod 4 and the end push rod 3 to move forward and backward.

[0063] A mounting block 8 is also provided at the rear end of the synchronous beam 6, and the clamping hydraulic cylinder 11 is installed on the mounting block 8. A receiving chamber 81 is provided on the mounting block 8, and the upper and lower ends of the receiving chamber 81 are penetrated to form openings. The piston rod of the clamping hydraulic cylinder 11 is connected to the intermediate push rod 4 through the third connecting portion 12, and the third connecting portion 12 is placed in the receiving chamber 81. In this way, the clamping hydraulic cylinder 11 can push the intermediate push rod 4 to move forward or backward on the synchronous beam 6, and then push the end push rod 3 to move forward or backward. At the same time, it also pushes the third connecting portion 12 to move forward or backward in the receiving chamber 81. It is easy to understand that the piston rods of the intermediate push rod 4 and the clamping hydraulic cylinder 11 both extend into the receiving chamber 81.

[0064] The adjusting pad 13 is detachably connected to the mounting block 8. The adjusting pad 13 is installed between the third connecting portion 12 and the inner wall of the accommodating chamber 81. When the clamping hydraulic cylinder 11 drives the third connecting portion 12, the intermediate push rod 4 and the end push rod 3 to move backward to the extreme point (that is, the clamping hydraulic cylinder 11 drives the end push rod 3 to release the clamp 2), the third connecting portion 12 abuts against the adjusting pad 13. When the clamping hydraulic cylinder 11 drives the third connecting portion 12, the intermediate push rod 4 and the end push rod 3 to move forward to the extreme point (that is, the clamping hydraulic cylinder 11 drives the end push rod 3 to clamp the clamp 2), the third connecting portion 12 is separated from the adjusting pad 13, that is, a gap appears between the third connecting portion 12 and the adjusting pad 13. If the end push rod 3 becomes shorter, the gap will increase. Of course, the number of the clamp 2, the end push rod 3, the intermediate push rod 4 and the clamping hydraulic cylinder 11 is multiple and one-to-one corresponding.

[0065] When the plate clamping mechanism of the aluminum plate stretching machine is used to clamp the aluminum plate, the pre-tightening hydraulic cylinder 9 is first started, so that the synchronous beam 6 drives the intermediate push rod 4 and the end push rod 3 to move forward together, and the intermediate push rod 4 moving forward pushes the corresponding clamp 2 to move forward, so that the clamp 2 acts on the surface of the aluminum plate until the synchronous beam 6 can no longer move forward. At this time, the clamp 2 is initially clamped on the surface of the aluminum plate, and then the pre-tightening hydraulic cylinder 9 is kept under pressure, and then the clamping hydraulic cylinder 11 is started again, thereby applying a forward thrust to the intermediate push rod 4 and the end push rod 3, and the end push rod 3 applies a thrust to the corresponding clamp 2, so that the clamp 2 further clamps the aluminum plate. If the front end of an end push rod 3 is worn so that the length of the end push rod 3 is smaller than that of the other end push rods 3, then when it is retracted into place, the front end of the end push rod 3 cannot be flush with the other end push rods 3. At this time, the adjustment pad 13 corresponding to the shorter end push rod 3 is replaced with a thicker plate, so that the front ends of all the end push rods 3 are flush when they are retracted into place.

[0066] Through the above structure, when the front end of an end push rod 3 of the aluminum plate stretching machine provided in this embodiment is worn, it is not necessary to replace the end push rod 3, but the corresponding adjustment pad 13 can be replaced with a thicker plate. Moreover, because the upper and lower ends of the accommodating cavity 81 are penetrated to form openings, the staff can conveniently disassemble and assemble the adjustment pad 13 from the above openings. Therefore, compared with the prior art, the plate clamping mechanism of the aluminum plate stretching machine can adjust the starting position of the worn end push rod 3 more quickly, so that the front ends of all the end push rods 3 are flush, which saves time and effort, shortens the idle time of equipment, and improves production efficiency.

[0067] It is worth noting that if the front end of an end push rod 3 is worn and the length of the end push rod 3 is smaller than the other end push rods 3, then when the clamp 2 is released and retracted into place, the front end of the end push rod 3 cannot be flush with the front ends of the other normal end push rods 3. Then, during the clamping process, when the pre-tightening hydraulic cylinder 9 pushes the other normal end push rods 3 to push the clamp 2 forward to initially clamp the aluminum plate, the clamp 2 pushed by the shorter end push rod 3 has not actually clamped the aluminum plate. At this time, the synchronous beam 6 will not move forward any further, but will start the clamping hydraulic cylinder 11. Obviously, the end push rod 3 of the clamp 2 that previously clamped the aluminum plate only needs the corresponding clamping hydraulic cylinder 11 to run a shorter stroke forward to completely clamp the aluminum plate. Therefore, the normal end push rod 3 will enable the corresponding clamp 2 to clamp the aluminum plate first, while the shorter end push rod 3 needs to move forward a greater distance to enable the corresponding clamp 2 to clamp the aluminum plate, so the shorter end push rod 3 requires a greater hydraulic action for the corresponding clamping hydraulic cylinder 11. When all the clamping hydraulic cylinders 11 are switched in series, different clamps 2 will be clamped on the aluminum plate surface at different times and the clamping force will be unevenly distributed. In the prior art, when the front end of the end push rod 3 is worn and cannot be flush with the other normal end push rods 3, the worn end push rod 3 is replaced. However, it is very troublesome to replace the end push rod 3 of the existing plate clamping mechanism. When the front end of a certain end push rod 3 is worn, the plate clamping mechanism of the aluminum plate stretching machine provided in this embodiment does not need to directly replace the end push rod 3, but only needs to replace the adjustment pad 13 in the accommodating chamber 81, which is simpler and more convenient to operate.

[0068] Optionally, the mounting block 8 disposed at the rear end of the synchronous beam 6 in this embodiment includes a main block body 82, a mounting plate 83 and a step plate 84, wherein:

[0069] The main block 82 is integrally formed or welded to the rear end of the synchronous beam 6. The main block 82 is provided with a through hole that penetrates the upper end, the lower end and the rear end. Specifically, the main block 82 is a square block. The mounting plate 83 is bolted to the rear end of the main block 82 and blocks the through hole from the rear end. At this time, the accommodating cavity 81 is formed between the main block 82 and the mounting plate 83. The adjusting pad 13 and the clamping hydraulic cylinder 11 are bolted to the mounting plate 83. The adjusting pad 13 is located in front of the mounting plate 83, and the main body of the clamping hydraulic cylinder 11 is located at the rear side of the mounting plate 83.

[0070] A stepped through hole is provided in the middle of the mounting plate 83, and the stepped plate 84 is adapted to the stepped through hole. The stepped plate 84 is placed in the stepped through hole, and the stepped plate 84 is bolted and fixed in the stepped through hole. A through hole is provided in the middle of the stepped plate 84, and the piston rod of the clamping hydraulic cylinder 11 is slidably inserted into the through hole. The clamping hydraulic cylinder 11 of the stepped plate 84 abuts against each other, thereby axially positioning the clamping hydraulic cylinder 11. The outer diameter of the third connecting portion 12 is larger than the aperture of the through hole and smaller than the aperture of the stepped through hole. In this way, the third connecting portion 12 cannot pass through the through hole on the stepped plate 84, but can pass through the stepped through hole on the mounting plate 83.

[0071] Through this structure, when the adjustment pad 13 is removed from the mounting plate 83 and the step plate 84 is removed from the mounting plate 83, the third connecting part 12, the middle push rod 4 and the end push rod 3 can be pushed out from the above-mentioned stepped through hole, thereby facilitating the removal of the end push rod 3.

[0072] Optionally, the third connecting portion 12 includes a sleeve, a first bolt 124 and a second bolt 125, wherein:

[0073] The sleeve is placed in the accommodating chamber 81 and can move forward and backward in the accommodating chamber 81. The rear end of the intermediate push rod 4 and the front end of the piston rod of the clamping hydraulic cylinder 11 are both inserted into the sleeve. The tube wall of the sleeve is provided with a first screw hole, and the circumferential side wall of the intermediate push rod 4 is provided with a first countersunk hole near its rear end. The first bolt 124 is screwed into the first screw hole and inserted into the first countersunk hole, that is, the first bolt 124 passes through the first screw hole and then inserts into the first countersunk hole, so that the sleeve and the intermediate push rod 4 are connected together. The tube wall of the sleeve is provided with a second screw hole, and the circumferential side wall of the piston rod of the clamping hydraulic cylinder 11 is provided with a second countersunk hole near its front end. The second bolt 125 is screwed into the second screw hole and inserted into the second countersunk hole, that is, the second bolt 125 passes through the second screw hole and then inserts into the second countersunk hole, so that the sleeve and the piston rod of the clamping hydraulic cylinder 11 are connected together. As in the prior art, the intermediate push rod 4 cannot rotate in the synchronous beam 6.

[0074] By means of the sleeve, the first bolt 124 and the second bolt 125, not only the intermediate push rod 4 and the clamping hydraulic cylinder 11 are connected together, but also because the intermediate push rod 4 cannot rotate, the piston rod of the clamping hydraulic cylinder 11 will not rotate during use. The nuts (i.e., screws) of the first bolt 124 and the second bolt 125 are both facing the opening at the top or the opening at the bottom of the accommodating chamber 81. The above structure can prevent the nuts (i.e., screws) of the first bolt 124 and the second bolt 125 from turning to the inner side wall of the accommodating chamber 81 when the equipment is running. In this way, it is ensured that the nuts (i.e., screws) of the first bolt 124 and the second bolt 125 are always facing the opening at the top or the opening at the bottom of the accommodating chamber 81, so as to facilitate the disassembly and assembly by the staff.

[0075] In addition, the third connection part 12 of this structure also has the advantage of being easy to disassemble and assemble. Specifically, by removing the first bolt 124, the connection between the third connection part 12 and the intermediate push rod 4 is disconnected, and by removing the second bolt 125, the connection between the third connection part 12 and the piston rod of the clamping hydraulic cylinder 11 is disconnected. In this case, the thrust of the clamping hydraulic cylinder 11 is transmitted to the intermediate push rod 4 through the first bolt 124 and the second bolt 125, and the first bolt 124 and the second bolt 125 are subjected to a large shear force. In order to avoid damage to the first bolt 124 and the second bolt 125, a better implementation of this embodiment is to set the above-mentioned sleeve to include a straight tube 121, two semicircular plates 123 and a connecting bolt 126, specifically:

[0076] Two baffles 122 facing each other are convexly provided on the inner wall at the rear end of the straight tube 121, and an insertion port is formed between the two baffles 122. The front end of the piston rod of the clamping hydraulic cylinder 11 is provided with two baffles facing each other to form a T-shaped head 111. The T-shaped head 111 is inserted into the straight tube 121 from the insertion port, and when the straight tube 121 rotates 90°, the baffles and the baffles 122 are attached to each other, that is, the baffles and the baffles 122 are stacked together. The first screw hole and the second screw hole are both opened in the tube wall of the straight tube 121, and when the baffles and the baffles 122 are stacked together, the first screw hole and the second screw hole are both facing the opening at the top or the opening at the bottom of the accommodating chamber 81. An annular groove 41 is provided on the circumferential side wall of the intermediate push rod 4 near its rear end, and two semicircular plates 123 are both clamped in the annular groove 41, and the two semicircular plates 123 are joined to form a full circular plate, and each semicircular plate 123 is bolted and fixed to the front end of the straight tube 121 by a connecting bolt 126. Specifically, a countersunk hole penetrating the front end face of the straight tube 121 is provided on the rear end face of the straight tube 121, and a threaded hole is provided on the semicircular plate 123. The connecting bolt 126 passes through the countersunk hole and is screwed to the threaded hole, thereby fixing the semicircular plate 123 to the front end of the straight tube 121. In this embodiment, the front end of the piston rod of the clamping hydraulic cylinder 11 after installation abuts against the rear end of the intermediate push rod 4.

[0077] Through the above structure, the axial thrust applied when the piston rod of the clamping hydraulic cylinder 11 moves will not be transmitted through the first bolt 124 and the second bolt 125, but will be transmitted through the abutment between the front end of the piston rod of the above-mentioned clamping hydraulic cylinder and the rear end of the intermediate push rod. When the clamping hydraulic cylinder 11 retracts, the axial force is transmitted through the cooperation between the entire circular plate and the groove wall and the cooperation between the T-shaped head 111 and the above-mentioned baffle 122, so that the above-mentioned first bolt 124 and the second bolt 125 can be prevented from being subjected to shear force.

[0078] In the above structure, when it is necessary to remove the end push rod 3, first remove the first bolt 124 and the second bolt 125, then rotate the straight pipe 121 90°, and then remove the bolts connecting the clamping hydraulic cylinder 11 and the mounting plate 83, and then pull the T-head 111 out of the above insertion port, so that the piston rod of the clamping hydraulic cylinder 11 is disconnected from the third connecting part 12, and then take out the piston rod of the clamping hydraulic cylinder 11 from the through hole of the step plate 84, and then remove the step plate 84 from the mounting plate 83 and remove the adjusting pad 13 from the mounting plate 83, and finally push the end push rod 3, the middle push rod 4 and the third connecting part 12 out of the step hole of the above mounting plate 83. It should be noted that the nut of the bolt (not shown in the figure) that bolts the step plate 84 to the mounting plate 83 faces backward. In fact, a countersunk hole is also provided on the rear side plate surface of the step plate 84, and a screw hole is provided on the mounting plate 83. The bolt connecting the step plate 84 and the mounting plate 83 passes through the countersunk hole and is screwed to the screw hole on the mounting plate 83, and the nut of the bolt sinks into the countersunk hole. In this way, when the clamping hydraulic cylinder 11 is removed, the nut of the bolt can be exposed, so that it is convenient for the staff to screw the bolt, thereby facilitating the removal of the step plate 84 from the mounting plate 83.

[0079] From the above analysis, it can be known that the clamping hydraulic cylinder 11, the third connecting part 12, the intermediate push rod 4 and the end push rod 3 of the plate clamping mechanism of the aluminum plate stretching machine provided in this embodiment can be conveniently disassembled and assembled on the equipment.

[0080] An optional implementation of this embodiment is as follows: the first connecting portion 5 includes a first chain plate 51 and two first locking pins 52, the rear end of the end push rod 3 is connected to the first chain plate 51 through one of the first locking pins 52, and the front end of the middle push rod 4 is connected to the first chain plate 51 through another first locking pin 52. In addition, the first connecting portion 5 can also be a coupling.

[0081] Specifically, the first chain plate 51 is provided with a first hinge hole and a second hinge hole, the rear end of the end push rod 3 is integrally formed with an insert block 31, and the insert block 31 is provided with a first pin hole corresponding to the first hinge hole. A butt joint 42 is fixedly provided at the middle part of the front end of the intermediate push rod 4, and the butt joint 42 is provided with a second pin hole corresponding to the second hinge hole, wherein one first locking pin 52 is inserted in the first hinge hole and the first pin hole, and the other first locking pin 52 is inserted in the second hinge hole and the second pin hole.

[0082] The above-mentioned first pin hole is a waist-shaped hole, and the abutment joint 42 abuts against the above-mentioned plug block 31, so that all the thrust of the intermediate push rod 4 is directly transmitted to the above-mentioned plug block 31 through the abutment joint 42, and is transmitted to the end push rod 3 through the plug block 31, thereby preventing the first lock pin 52 from being subjected to thrust; when the clamping hydraulic cylinder 11 applies a pulling force, the intermediate push rod 4 drives the end push rod 3 through the first connecting part 5, and at this time, the very small pulling force is all borne by the first chain plate 51 and the first lock pin 52, so that the shear force that the first lock pin 52 bears when transmitting force can be greatly reduced to avoid the first lock pin 52 from breaking when transmitting axial force.

[0083] More preferably, there are two first chain plates 51, which are stacked on both sides of the abutment joint 42. At this time, the abutment joint 42, the first chain plates 51 and the first locking pin 52 constitute a head assembly, and the outer diameter of the head assembly is smaller than the intermediate push rod 4. Therefore, the head assembly can also slide in the wear-resistant copper sleeve in the synchronization beam 6.

[0084] An optional implementation of this embodiment is as follows: the above-mentioned two connecting parts include a second chain plate 101 and two second locking pins 102, and the rear end of the synchronous beam 6 is also integrally formed or welded with a connecting rod 61, the connecting rod 61 is connected to the second chain plate 101 through one of the second locking pins 102, and the piston rod of the pre-tightening hydraulic cylinder 9 is connected to the second chain plate 101 through another second locking pin 102. Specifically, the above-mentioned connecting rods 61 are provided on both sides of the rear end of the synchronous beam 6, and each connecting rod 61 is connected to one of the above-mentioned pre-tightening hydraulic cylinders 9. In addition, the above-mentioned second connecting part 10 can also be a coupling.

[0085] Optionally, the second chain plate 101 is provided with a third hinge hole and a fourth hinge hole, the connecting rod 61 is provided with a third pin hole corresponding to the third hinge hole, the piston rod of the preloaded hydraulic cylinder 9 is provided with a fourth pin hole corresponding to the fourth hinge hole, one of the second locking pins 102 is inserted in the third hinge hole and the third pin hole, and the other second locking pin 102 is inserted in the fourth hinge hole and the fourth pin hole.

[0086] The fourth hinge hole is a waist-shaped hole, and the piston rod of the pre-tightening hydraulic cylinder 9 is in contact with the connecting rod 61. In this way, when the pre-tightening hydraulic cylinder 9 applies thrust, all the thrust of the pre-tightening hydraulic cylinder 9 is directly transmitted to the connecting rod 61 through the piston rod, and finally transmitted to the synchronous beam 6 through the connecting rod 61, and will not be transmitted to the second chain plate 101 and the second locking pin 102; when the pre-tightening hydraulic cylinder 9 applies tension, all the tension of the pre-tightening hydraulic cylinder 9 drives the synchronous beam 6 to retreat through the second connecting part 10. At this time, the very small tension is borne entirely by the second chain plate 101 and the second locking pin 102. In this way, the load on the second locking pin 102 can be greatly reduced, avoiding the second locking pin 102 from breaking when transmitting axial force.

[0087] Embodiment 2:

[0088] This embodiment provides a push rod adjustment method for adjusting the position of the end push rod 3 of the plate clamping mechanism of the aluminum plate stretching machine described in Example 1. Specifically, the position is the starting position of the end push rod 3. The method includes:

[0089] Step 1: Take a plate and place it between the clamps 2 so that the plate covers all the clamps 2;

[0090] Step 2: Start the pre-tightening hydraulic cylinder 9, push the synchronous beam 6 to drive the middle push rod 4 and the end push rod 3 to move forward synchronously, so that the clamp 2 initially clamps the plate until the synchronous beam 6 can no longer move forward, and then the pre-tightening hydraulic cylinder 9 maintains pressure;

[0091] Step 3: Start the clamping hydraulic cylinder 11 to push the middle push rod 4 and the end push rod 3 to move forward synchronously again, so that all clamps 2 further clamp the plate, and then the clamping hydraulic cylinder 11 maintains pressure;

[0092] Step 4: Measure the distances between all the third connecting parts 12 and the corresponding adjusting pads 13 from the opening of the mounting block 8 to obtain the measurement results. It should be noted that if the front end of a certain end push rod 3 is worn and the length of the end push rod 3 is shorter, then when clamped, the distance between the third connecting part 12 corresponding to the end push rod 3 and the corresponding adjusting pad 13 is larger.

[0093] Step 5: According to the measurement results, replace the adjustment pads 13 of different thicknesses so that the spacing between all the third connecting parts 12 and the corresponding adjustment pads 13 is the same, so that the front ends of all the end push rods 3 are flush. In fact, when the front end of a certain end push rod 3 is worn, the spacing between the third connecting part 12 corresponding to the end push rod 3 and the corresponding adjustment pad 13 is larger. At this time, it is necessary to replace the adjustment pad 13 with a thicker adjustment pad 13, so that the clamping hydraulic cylinder 11 corresponding to the end push rod 3 retreats a shorter stroke and the corresponding third connecting part 12 abuts against the adjustment pad 13. At this time, the distance of the front end of the end push rod 3 retreating is smaller, and the distance of the normal end push rod 3 retreating is larger. In this way, all the end push rods 3 retreat to the position where the front ends are flush after the clamping hydraulic cylinder 11 is depressurized.

[0094] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A plate clamping mechanism for an aluminum plate stretching machine, characterized in that: include: A clamp (2) and an end push rod (3) for pushing the clamp (2), wherein the clamp (2) and the end push rod (3) are both slidably mounted on the stretching head (1); An intermediate push rod (4), the end push rod (3) being connected to the intermediate push rod (4) via a first connecting portion (5); A synchronous beam (6) is slidably mounted on a mounting frame (7), the intermediate push rod (4) is slidably mounted on the synchronous beam (6), a mounting block (8) is provided at the rear end of the synchronous beam (6), the mounting block (8) is provided with a receiving cavity (81), and both upper and lower ends of the receiving cavity (81) are penetrated to form openings; A pre-tightening hydraulic cylinder (9) is mounted on the mounting frame (7), and a piston rod of the pre-tightening hydraulic cylinder (9) is connected to the synchronous beam (6) via a second connecting portion (10); A clamping hydraulic cylinder (11) is mounted on the mounting block (8), and a piston rod of the clamping hydraulic cylinder (11) is connected to the intermediate push rod (4) via a third connecting portion (12), wherein the third connecting portion (12) is disposed in the accommodating cavity (81); An adjusting pad (13) is detachably connected to the mounting block (8), and the adjusting pad (13) is cushioned between the third connecting portion (12) and the inner wall of the accommodating cavity (81).

2. The plate clamping mechanism of the aluminum plate stretching machine according to claim 1, characterized in that: The mounting block (8) comprises: A main block (82) is fixedly mounted at the rear end of the synchronous beam (6), and the main block (82) is provided with a through opening penetrating through the upper end, the lower end and the rear end thereof; A mounting plate (83) is bolted and fixed to the rear end of the main block (82) and blocks the through opening from the rear end, the accommodating cavity (81) is formed between the mounting plate (83) and the main block (82), and the adjusting pad (13) and the clamping hydraulic cylinder (11) are both bolted and fixed to the mounting plate (83); A step plate (84), the mounting plate (83) is provided with a step through hole, the step plate (84) is bolted and fixed in the step through hole, the step plate (84) is provided with a through hole, the piston rod of the clamping hydraulic cylinder (11) is slidably connected to the through hole, and the outer diameter of the third connecting part (12) is larger than the aperture of the through hole and smaller than the aperture of the step through hole.

3. The plate clamping mechanism of the aluminum plate stretching machine according to claim 2, characterized in that: The third connecting portion (12) comprises: A sleeve, in which the rear end of the intermediate push rod (4) and the front end of the piston rod of the clamping hydraulic cylinder (11) are both inserted; A first bolt (124), a first screw hole is formed in the wall of the sleeve, a first countersunk hole is formed in the intermediate push rod (4), and the first bolt (124) is screwed into the first screw hole and inserted into the first countersunk hole; A second bolt (125), a second screw hole is opened on the tube wall of the sleeve, a second countersunk hole is opened on the piston rod of the clamping hydraulic cylinder (11), and the second bolt (125) is screwed into the second screw hole and inserted into the second countersunk hole.

4. The plate clamping mechanism of the aluminum plate stretching machine according to claim 3, characterized in that: The sleeve comprises: A straight tube (121), wherein the first screw hole and the second screw hole are both opened on the tube wall of the straight tube (121), two baffles (122) facing each other are convexly provided on the inner wall at the rear end of the straight tube (121), an insertion port is formed between the two baffles (122), and the front end of the piston rod of the clamping hydraulic cylinder (11) is provided with two baffles facing each other to form a T-shaped head (111), the T-shaped head (111) is inserted into the straight tube (121) from the insertion port, and when the straight tube (121) is rotated 90 degrees, the baffles and the baffles (122) are in contact with each other; Two semicircular plates (123), an annular groove (41) close to the rear end of the intermediate push rod (4) is provided on the circumferential side wall of the intermediate push rod (4), the two semicircular plates (123) are both clamped in the annular groove (41), and the two semicircular plates (123) are joined together to form a full circular plate; Connecting bolts (126), each of the semicircular plates (123) is bolted and fixed to the front end of the straight pipe (121) via a connecting bolt (126).

5. The plate clamping mechanism of the aluminum plate stretching machine according to any one of claims 1 to 4, characterized in that: The first connecting portion (5) comprises a first chain plate (51) and two first locking pins (52); the rear end of the end push rod (3) is connected to the first chain plate (51) via one of the first locking pins (52); and the front end of the intermediate push rod (4) is connected to the first chain plate (51) via another of the first locking pins (52).

6. The plate clamping mechanism of the aluminum plate stretching machine according to claim 5, characterized in that: The first chain plate (51) is provided with a first hinge hole and a second hinge hole; A plug block (31) is fixedly provided at the rear end of the end push rod (3), and a first pin hole corresponding to the first hinge hole is opened on the plug block (31); a butt joint (42) is fixedly provided at the middle of the front end of the intermediate push rod (4), and a second pin hole corresponding to the second hinge hole is opened on the butt joint (42), wherein one of the first locking pins (52) is inserted into the first hinge hole and the first pin hole, and another of the first locking pins (52) is inserted into the second hinge hole and the second pin hole, wherein the first hinge hole is a waist-shaped hole, and the butt joint (42) is in abutment with the plug block (31).

7. The plate clamping mechanism of the aluminum plate stretching machine according to claim 6, characterized in that: There are two first chain plates (51), which are stacked on both sides of the abutment joint (42). The abutment joint (42), the first chain plates (51) and the first locking pin (52) form a head assembly, and the outer diameter of the head assembly is smaller than that of the intermediate push rod (4).

8. The plate clamping mechanism of the aluminum plate stretching machine according to any one of claims 1 to 4, characterized in that: The second connecting portion (10) comprises a second chain plate (101) and two second locking pins (102); a connecting rod (61) is fixedly provided at the rear end of the synchronous beam (6); the connecting rod (61) is connected to the second chain plate (101) via one of the second locking pins (102); and the piston rod of the preload hydraulic cylinder (9) is connected to the second chain plate (101) via another of the second locking pins (102).

9. The plate clamping mechanism of the aluminum plate stretching machine according to claim 8, characterized in that: The second chain plate (101) is provided with a third hinge hole and a fourth hinge hole; The connecting rod (61) is provided with a third pin hole corresponding to the third hinge hole, and the piston rod of the pre-tightening hydraulic cylinder (9) is provided with a fourth pin hole corresponding to the fourth hinge hole, wherein one of the second locking pins (102) is inserted into the third hinge hole and the third pin hole, and another of the second locking pins (102) is inserted into the fourth hinge hole and the fourth pin hole, wherein the fourth hinge hole is a waist-shaped hole, and the piston rod of the pre-tightening hydraulic cylinder (9) is in contact with the connecting rod (61).

10. A push rod adjustment method for adjusting the position of the end push rod (3) of the sheet clamping mechanism according to any one of claims 1 to 9, characterized in that: include: Step 1: Take a plate and place it between the clamps (2) so that the plate covers all the clamps (2); Step 2: Start the pre-tightening hydraulic cylinder (9), push the synchronous beam (6) to drive the middle push rod (4) and the end push rod (3) to move forward synchronously, so that the clamp (2) initially clamps the plate until the synchronous beam (6) can no longer move forward, and then the pre-tightening hydraulic cylinder (9) maintains pressure; Step 3: Start the clamping hydraulic cylinder (11), push the middle push rod (4) and the end push rod (3) to move forward synchronously again, so that all clamps (2) further clamp the plate, and then make the clamping hydraulic cylinder (11) maintain pressure; Step 4: measuring the distances between all the third connecting parts (12) and the corresponding adjustment pads (13) from the opening of the mounting block (8) to obtain measurement results; Step 5: According to the measurement results, replace the adjustment pads (13) of different thicknesses so that the spacing between all the third connecting parts (12) and the corresponding adjustment pads (13) is the same, so that the front ends of all the end push rods (3) are flush.

Images