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

Abstract

This invention relates to a sheet metal clamping mechanism and its push rod adjustment method for an aluminum sheet stretching machine, belonging to the technical field of sheet metal stretching machines. The clamping mechanism includes a clamp and an end push rod, which are slidably mounted on the stretching head; an intermediate push rod, with the end push rod connected to the intermediate push rod via a first connecting part; a synchronous beam, slidably mounted on a mounting frame, with the intermediate push rod slidably mounted on the synchronous beam; a mounting block on the synchronous beam, with a receiving cavity at both ends of the receiving cavity forming openings; a pre-tightening hydraulic cylinder, mounted on the mounting frame, with its piston rod connected to the synchronous beam via a second connecting part; a clamping hydraulic cylinder, mounted on the mounting block, with its piston rod connected to the intermediate push rod via a third connecting part, which is located within the receiving cavity; and an adjusting shim, connected to the mounting block, positioned between the third connecting part and the inner wall of the receiving cavity. The above method changes the starting position of the end push rod by replacing adjusting shims of different thicknesses.

Description

Technical Field

[0001] This invention belongs to the technical field of sheet metal stretching machines, and specifically relates to a sheet metal clamping mechanism for an aluminum sheet stretching machine and a push rod adjustment method thereof. Background Technology

[0002] Current aluminum sheet stretching machines are typically equipped with a sheet clamping mechanism. This mechanism includes two stretching heads with jaws between them. Each stretching head has a clamp slidably mounted in the jaws. The clamps are pushed forward by an end push rod, causing the clamps on the two stretching heads to come together and clamp the sheet. Each stretching head also has a wire rope and a hydraulic cylinder for driving the wire rope. The clamps on the stretching head are connected to the wire rope. When it is necessary to release the clamped aluminum sheet, the end push rod is first driven to move backward, and then the hydraulic cylinder is activated to pull the wire rope. The wire rope pulls the clamps backward, causing the clamps on the two stretching heads to separate. To ensure smooth movement of the end push rod, a slide rail is provided inside the stretching head, in which the end push rod is slidably inserted.

[0003] One end of the end push rod is close to the clamp, and the other end is connected to one end of the intermediate push rod via a first connecting part. This type of sheet metal clamping mechanism also includes a synchronous beam that can slide within a mounting frame. A connecting block is provided at the rear end of the synchronous beam. A pre-tensioning hydraulic cylinder is mounted on the mounting frame. The piston rod of the pre-tensioning hydraulic cylinder is connected to the connecting block via a second connecting part, thereby using the pre-tensioning hydraulic cylinder to push the entire synchronous beam forward or backward. A channel is provided within the synchronous beam, and the intermediate push rod is slidably inserted into the channel. A clamping hydraulic cylinder is mounted on the synchronous beam, and the piston rod of the clamping hydraulic cylinder is connected to the other end of the intermediate push rod via a third connecting part. Thus, the clamping hydraulic cylinder can push the intermediate push rod, causing the end push rod to move forward or backward.

[0004] Typically, an aluminum plate stretching machine has multiple clamps in its plate clamping mechanism, along with multiple end push rods and intermediate push rods. To ensure that each clamp applies uniform pressure to the aluminum plate surface, ideally, the front ends of the multiple end push rods are flush. When the clamping hydraulic cylinder travels the same stroke / time, the multiple end push rods simultaneously push the corresponding clamps to act on different positions on the aluminum plate surface, thereby applying a uniform clamping force to 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 clamp slides on the stretching head along an oblique line with an angle to the axis of the end push rod, relative sliding occurs between the front end of the end push rod and the clamp when the end push rod pushes the clamp forward. Over a long period of use, this relative sliding will cause wear on the front end of the end push rod, resulting in multiple end push rods of different lengths. Moreover, there are also tolerances in the manufacturing of the end push rods, resulting in different lengths. Thus, 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 eventually be pushed to fully clamp the aluminum plate, the different parts of the aluminum plate are clamped at different times, which will generate different clamping pressures on the surface of the aluminum plate and affect the stretching.

[0005] Currently, when the end push rod is severely worn, the end push rod can only be replaced. However, replacing the end push rod is very troublesome and time-consuming. The machine must be stopped during the replacement process, and the long downtime reduces production efficiency. Summary of the Invention

[0006] This invention provides a plate clamping mechanism for an aluminum plate stretching machine and a push rod adjustment method thereof, to solve the technical problem.

[0007] This invention is achieved through the following technical solution: a plate clamping mechanism for an aluminum plate stretching machine, comprising:

[0008] The clamp and the end push rod for pushing the clamp are slidably mounted on the stretching head;

[0009] An intermediate push rod, wherein the end push rod is connected to the intermediate push rod via a first connecting part;

[0010] A synchronous beam is slidably mounted on a 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 has a receiving cavity, and both the upper and lower ends of the receiving cavity are through-holes.

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

[0012] A clamping hydraulic cylinder is mounted on the mounting block. The piston rod of the clamping hydraulic cylinder is connected to the intermediate push rod through a third connecting part, wherein the third connecting part is placed in the receiving cavity.

[0013] An adjusting pad is detachably connected to the mounting block, and the adjusting pad is installed between the third connecting part and the inner wall of the receiving cavity.

[0014] Furthermore, to better realize the present invention, the mounting block includes:

[0015] The main block is fixed to the rear end of the synchronous beam, and the main block has a through-hole that passes through its upper end, lower end and rear end;

[0016] The mounting plate is bolted to the rear end of the main block and blocks 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 both bolted to the mounting plate.

[0017] The mounting plate has a stepped through hole, and the stepped plate is bolted and fixed in the stepped through hole. The stepped plate also has a through hole, through which the piston rod of the clamping hydraulic cylinder slides. The outer diameter of the third connecting part is larger than the diameter of the through hole and smaller than the diameter of the stepped through hole.

[0018] Furthermore, to better realize the present invention, the third connecting portion includes:

[0019] The sleeve, the rear end of the intermediate push rod and the front end of the piston rod of the clamping hydraulic cylinder are all inserted into the sleeve;

[0020] The first bolt is bolted to the first bolt hole and inserted into the first countersunk hole.

[0021] The second bolt is screwed into the second threaded hole and inserted into the second countersunk hole. The sleeve wall has a second threaded hole, and the piston rod of the clamping hydraulic cylinder has a second countersunk hole.

[0022] Furthermore, to better realize the present invention, the sleeve includes:

[0023] A straight tube has both the first and second screw holes formed on its wall. Two opposing baffles protrude from the inner wall of the rear end of the straight tube, forming an insertion port between the two baffles. The piston rod of the clamping hydraulic cylinder has two opposing stops forming a T-shaped head at its front end. The T-shaped head is inserted into the straight tube through the insertion port, and when the straight tube rotates 90°, the stops are in contact with the baffles.

[0024] Two semicircular plates, with an annular groove near its rear end on the circumferential side wall of the middle push rod, both semicircular plates are engaged in the annular groove, and the two semicircular plates are joined together to form a whole circular plate.

[0025] Each of the semicircular plates is bolted and fixed to the front end of the straight pipe by 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 the other first locking pin.

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

[0028] The end push rod has a fixed insert block at its rear end, and the insert block has a first pin hole corresponding to the first hinge hole. The middle part of the front end of the intermediate push rod has a fixed abutment, and the abutment has a second pin hole corresponding to the second hinge hole. One of the first locking pins is inserted into the first hinge hole and the first pin hole, and the other of the first locking pins is inserted into the second hinge hole and the second pin hole. The first hinge hole is an oblong hole, and the abutment abuts against the insert block.

[0029] Furthermore, in order to better realize the present invention, there are two first chain plates, which are stacked on both sides of the abutment. The abutment, the first chain plates and the first locking pin constitute a head assembly, and the outer diameter of the head assembly is smaller than that of 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 fixedly provided at 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 the other second locking pin.

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

[0032] The connecting rod has a third pin hole corresponding to the third hinge hole, and the piston rod of the pre-tightening hydraulic cylinder has a fourth pin hole corresponding to the fourth hinge hole. One second locking pin is inserted into the third hinge hole and the third pin hole, and another second locking pin is inserted into the fourth hinge hole and the fourth pin hole. The fourth hinge hole is an oblong hole, and the piston rod of the pre-tightening hydraulic cylinder abuts against the connecting rod.

[0033] The push rod adjustment method provided by this invention, for adjusting the position of the end push rod of the aforementioned plate clamping mechanism, includes:

[0034] Step 1: Take a piece of board and place it between the clamps so that the board 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 make the pre-tightening hydraulic cylinder maintain pressure;

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

[0037] Step 4: Measure the distance between all third connecting parts and the corresponding adjusting pads from the opening of the mounting block (i.e., the opening of the aforementioned accommodating cavity) to obtain the measurement results;

[0038] Step 5: Based on the measurement results, replace the adjusting pads with different thicknesses so that the distance between all the third connecting parts and the corresponding adjusting 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 advantages:

[0040] The sheet metal clamping mechanism of the aluminum sheet stretching machine provided by this invention includes a stretching head, clamps, end push rods, intermediate push rods, a synchronous beam, a mounting frame, a pre-tightening hydraulic cylinder, a clamping hydraulic cylinder, and an adjusting pad. The clamps and end push rods are slidably mounted on the stretching head. The end push rods are used to push the clamps, and are connected to the intermediate push rods via a first connecting part. The intermediate push rods are slidably mounted on the synchronous beam, which is in turn slidably mounted on the mounting frame. The pre-tightening hydraulic cylinder is mounted on the mounting frame, and its piston rod is connected to the synchronous beam via a second connecting part. Thus, when the pre-tightening hydraulic cylinder operates, it can move forward or backward on the mounting frame via the synchronous beam, thereby driving the intermediate push rods and end push rods to move forward and backward. A mounting block is also provided at the rear end of the synchronous beam, and the clamping hydraulic cylinder is mounted on the mounting block. The mounting block has a receiving cavity with openings at both its upper and lower ends. The piston rod of the hydraulic cylinder is connected to the intermediate push rod via a third connecting part, which is placed in the accommodating cavity. Thus, the clamping hydraulic cylinder can push the intermediate push rod to move forward or backward on the synchronous beam, which in turn will push the end push rod to move forward or backward. At the same time, it will also push the third connecting part to move forward or backward in the accommodating cavity. The adjusting pad is detachably connected to the mounting block and is placed between the third connecting part and the inner wall of the accommodating cavity. When the clamping hydraulic cylinder drives the third connecting part, 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 abuts against the adjusting pad. When the clamping hydraulic cylinder drives the third connecting part, 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 separates from the adjusting pad. Of course, the number of the aforementioned clamps, end push rods, intermediate push rods, and clamping hydraulic cylinders are all multiple and correspond one-to-one.

[0041] When the plate clamping mechanism of this aluminum plate stretching machine is used to clamp the aluminum plate, the pre-tightening hydraulic cylinder is first activated, causing the synchronous beam to move forward together with the intermediate push rod and the end push rod. The forward-moving intermediate push rod 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 point, the clamp initially clamps the surface of the aluminum plate. Then, the pre-tightening hydraulic cylinder is used to maintain pressure, and then the clamping hydraulic cylinder is activated, thereby applying a forward thrust to the intermediate push rod and the end push rod. The end push rod then applies a thrust to the corresponding clamp, thereby causing the clamp to further clamp the aluminum plate. If the front end of a certain end push rod is worn, making the length of the end push rod shorter than the other end push rods, then when it retracts to the final position, the front end of the end push rod cannot be flush with the other end push rods. In this case, the adjusting shim 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 retracted to the final position.

[0042] With the above structure, when the front end of a certain 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. Instead, the corresponding adjusting pad can be replaced with a thicker plate. Furthermore, since the upper and lower ends of the accommodating cavity are through-holes, the operator can easily disassemble and install the adjusting pad through the 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 end push rods are flush, saving time and effort, shortening equipment downtime, and improving production efficiency. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a front view structural schematic diagram of the plate clamping mechanism of the aluminum plate stretching machine provided in an embodiment of the present invention;

[0045] Figure 2 yes Figure 1 A magnified view of region A in the image;

[0046] Figure 3 yes Figure 2 A magnified view of region B in the image;

[0047] Figure 4 yes Figure 2 A magnified view of region C in the image;

[0048] Figure 5 This is a top view of the plate clamping mechanism of the aluminum plate stretching machine provided in an embodiment of the present invention (the stretching head and clamps are not shown).

[0049] Figure 6 yes Figure 5 A magnified view of region D in the image;

[0050] Figure 7 yes Figure 5 A magnified view of region E in the image;

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

[0052] Figure 9 This is a structural schematic diagram of the third connecting part in an embodiment of the present invention (the first and second bolts are not shown);

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

[0054] In the picture:

[0055] 1-Tension head, 2-Clamping clamp, 3-End push rod, 31-Insertion block, 4-Intermediate push rod, 41-Annular groove, 42-Abutment joint, 5-First connecting part, 51-First chain plate, 52-First locking pin, 6-Synchronous beam, 61-Connecting rod, 7-Mounting bracket, 8-Mounting block, 81-Accommodating cavity, 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-Semi-circular plate, 124-First bolt, 125-Second bolt, 126-Connecting bolt, 13-Adjusting pad. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0057] It is worth noting that the concepts of front, back, up, and down in this embodiment are attached. Figure 1 Based on the concepts of front, back, up, and down shown, for specific details, please refer to the attached diagram. Figure 1 The left side shown is the front, with the left side attached. Figure 1 The right side shown is the rear, attached. Figure 1 The upper part shown is the top, with appendix. Figure 1 The lower part is shown below.

[0058] Example 1:

[0059] like Figures 1-10 As shown, the sheet metal clamping mechanism of the aluminum sheet 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] Both the clamps 2 and the end push rods 3 are slidably mounted on the stretching head 1. It should be noted that there are two stretching heads 1, forming a jaw for clamping the aluminum plate between them. Each stretching head 1 is provided with several inclined guide rails, and a clamp 2 is slidably mounted on each guide rail. Each clamp 2 corresponds to an end push rod 3. The end push rod 3 is used to push the clamps 2, causing them to move forward. When the clamps 2 move forward, the clamps 2 on the two stretching heads 1 come together to clamp the aluminum plate located between them. This embodiment uses one clamp 2, one end push rod 3, one intermediate push rod 4, one clamping hydraulic cylinder 11, and one adjusting pad 13 as an example for explanation. In reality, the connection and positional relationships of all clamps 2 corresponding to the end push rod 3, intermediate push rod 4, clamping hydraulic cylinder 11, and adjusting pad 13 are the same. The end push rod 3 is connected to the intermediate push rod 4 through the first connecting part 5. The tension head 1 is also equipped with a slide rail, in which the end push rod 3 is slidably inserted to make the back-and-forth movement of the end push rod 3 smoother. Similar to the prior art, the tension head 1 is also equipped with a hydraulic cylinder for driving the movement of the wire rope. The wire rope is connected to the clamp 2. When it is necessary to release the clamped aluminum plate, the hydraulic cylinder operates to pull the wire rope, thereby using the wire rope to drag the clamp 2 backward.

[0061] The intermediate push rod 4 is slidably mounted on the synchronous beam 6. Specifically, a channel is provided inside the synchronous beam 6, and a wear-resistant copper sleeve is installed in the channel. The intermediate push rod 4 is slidably inserted into the wear-resistant copper sleeve. The synchronous beam 6 is slidably mounted on the mounting frame 7. Similar to the prior art, the mounting frame 7 is provided with a sliding plate, and a copper slider is provided on the outer wall of the synchronous beam 6. The copper slider is slidably mounted on the sliding plate, thereby allowing the synchronous beam 6 to be slidably mounted on the mounting frame 7.

[0062] The aforementioned pre-tightening hydraulic cylinder 9 is mounted on the mounting frame 7. 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 running, it can move forward or backward on the mounting frame 7 through the synchronous beam 6, thereby driving the intermediate push rod 4 and the end push rod 3 to move forward and backward.

[0063] A mounting block 8 is provided at the rear end of the synchronous beam 6. The aforementioned clamping hydraulic cylinder 11 is mounted on the mounting block 8. The mounting block 8 has a receiving cavity 81, with openings at both the upper and lower ends. The piston rod of the clamping hydraulic cylinder 11 is connected to the intermediate push rod 4 via a third connecting part 12, which is placed in the receiving cavity 81. Thus, the clamping hydraulic cylinder 11 can push the intermediate push rod 4 to move forward or backward on the synchronous beam 6, thereby also pushing the end push rod 3 to move forward or backward. Simultaneously, it will also push the third connecting part 12 to move forward or backward within the receiving cavity 81. It is easy to understand that both the intermediate push rod 4 and the piston rod of the clamping hydraulic cylinder 11 extend into the receiving cavity 81.

[0064] The adjusting pad 13 is detachably connected to the mounting block 8. The adjusting pad 13 is fitted between the third connecting part 12 and the inner wall of the accommodating cavity 81. When the clamping hydraulic cylinder 11 drives the third connecting part 12, the intermediate push rod 4, and the end push rod 3 to move backward to the extreme point (i.e., the clamping hydraulic cylinder 11 drives the end push rod 3 to release the clamp 2), the third connecting part 12 abuts against the adjusting pad 13. When the clamping hydraulic cylinder 11 drives the third connecting part 12, the intermediate push rod 4, and the end push rod 3 to move forward to the extreme point (i.e., the clamping hydraulic cylinder 11 drives the end push rod 3 to clamp the clamp 2), the third connecting part 12 separates from the adjusting pad 13, creating a gap between the third connecting part 12 and the adjusting pad 13. If the end push rod 3 becomes shorter, this gap will increase. Of course, the number of clamps 2, end push rods 3, intermediate push rods 4, and clamping hydraulic cylinders 11 are multiple and correspond one-to-one.

[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 activated, which causes the synchronous beam 6 to move forward together with the intermediate push rod 4 and the end push rod 3. The forward-moving intermediate push rod 4 pushes the corresponding clamp 2 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 initially clamps the surface of the aluminum plate. Then the pre-tightening hydraulic cylinder 9 is pressed, and then the clamping hydraulic cylinder 11 is activated, which applies a forward thrust to the intermediate push rod 4 and the end push rod 3. The end push rod 3 applies a thrust to the corresponding clamp 2, which further clamps the aluminum plate. If the front end of a certain end push rod 3 is worn, making its length less than that of the other end push rods 3, then when it retracts to the correct position, the front end of that end push rod 3 cannot be flush with the other end push rods 3. In this case, the adjusting pad 13 corresponding to the shorter end push rod 3 is replaced with a thicker plate, so that the front ends of all end push rods 3 are flush when they retract to the correct position.

[0066] With the above structure, when the front end of a certain 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. Instead, the corresponding adjusting pad 13 can be replaced with a thicker plate. Since the upper and lower ends of the accommodating cavity 81 are through-holes, the operator can easily disassemble and install the adjusting pad 13 through the openings. Therefore, compared with the prior art, the plate clamping mechanism of this 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 end push rods 3 are flush, saving time and effort, shortening the idle time of the equipment, and improving production efficiency.

[0067] It is worth noting that if the front end of a certain end push rod 3 is worn, resulting in its length being less than that of the other end push rods 3, then when the clamp 2 is released and retracted to its position, the front end of that end push rod 3 will not be flush with the front ends of the other normal end push rods 3. In this case, 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 yet clamped the aluminum plate. At this time, the synchronous beam 6 will not move forward again, but will activate 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 move forward a shorter stroke to fully clamp the aluminum plate. Therefore, the normal end push rod 3 will cause 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 make the corresponding clamp 2 clamp the aluminum plate. Therefore, the clamping hydraulic cylinder 11 corresponding to the shorter end push rod 3 requires a greater hydraulic force. When all clamping hydraulic cylinders 11 are switched in series, it will result in different clamping times of different clamps 2 on the aluminum plate surface and uneven distribution of clamping force. In the prior art, when the front end of the end push rod 3 is worn and cannot be aligned with the other normal end push rods 3, the worn end push rod 3 is replaced. However, replacing the end push rod 3 in the existing plate clamping mechanism is very troublesome. In the plate clamping mechanism of the aluminum plate stretching machine provided in this embodiment, when the front end of a certain end push rod 3 is worn, it is not necessary to directly replace the end push rod 3. Instead, the adjusting shim 13 can be replaced in the receiving cavity 81, which is simpler and more convenient.

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

[0069] The main block 82 is integrally formed or welded to the rear end of the aforementioned synchronous beam 6. The main block 82 has a through-hole extending through its upper end, lower end, and rear end. Specifically, the main block 82 is a cube. The aforementioned mounting plate 83 is bolted to the rear end of the main block 82 and seals the through-hole from the rear end. At this time, the aforementioned accommodating cavity 81 is formed between the main block 82 and the aforementioned mounting plate 83. The aforementioned adjusting pad 13 and clamping hydraulic cylinder 11 are both bolted to the aforementioned 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 on the rear side of the mounting plate 83.

[0070] The mounting plate 83 has a stepped through hole in its center. A stepped plate 84 is fitted into this stepped through hole and is bolted to it. A through hole is formed in the center of the stepped plate 84, through which the piston rod of the clamping hydraulic cylinder 11 slides. The stepped plate 84 abuts against the clamping hydraulic cylinder 11, thereby axially positioning the clamping hydraulic cylinder 11. The outer diameter of the third connecting part 12 is larger than the diameter of the through hole but smaller than the diameter of the stepped through hole. Therefore, the third connecting part 12 cannot pass through the through hole in the stepped plate 84, but it can pass through the stepped through hole in the mounting plate 83.

[0071] With this structure, when the adjusting pad 13 is removed from the mounting plate 83 and the stepped plate 84 is removed from the mounting plate 83, the third connecting part 12, the intermediate push rod 4 and the end push rod 3 can be pushed out from the stepped through hole, thereby facilitating the removal of the end push rod 3.

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

[0073] The sleeve is placed in the aforementioned receiving cavity 81 and can move back and forth within the receiving cavity 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. A first threaded hole is formed in the wall of the sleeve, and a first countersunk hole is formed on the circumferential side wall of the intermediate push rod 4 near its rear end. A first bolt 124 is screwed into the first threaded hole and inserted into the first countersunk hole, that is, the first bolt 124 passes through the first threaded hole and is inserted into the first countersunk hole, thereby connecting the sleeve and the intermediate push rod 4 together. A second threaded hole is formed in the wall of the sleeve, and a second countersunk hole is formed on the circumferential side wall of the piston rod of the clamping hydraulic cylinder 11 near its front end. A second bolt 125 is screwed into the second threaded hole and inserted into the second countersunk hole, that is, the second bolt 125 passes through the second threaded hole and is inserted into the second countersunk hole, thereby connecting the sleeve and the piston rod of the clamping hydraulic cylinder 11 together. As with the prior art, the aforementioned intermediate push rod 4 cannot rotate within the aforementioned synchronous beam 6.

[0074] By using the aforementioned sleeve, first bolt 124, and second bolt 125, not only are the intermediate push rod 4 and the clamping hydraulic cylinder 11 connected together, but 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., threads) of the first bolt 124 and second bolt 125 both face the opening at the top or bottom of the accommodating cavity 81. This structure prevents the nuts (i.e., threads) of the first bolt 124 and second bolt 125 from rotating towards the inner wall of the accommodating cavity 81 during equipment operation. This ensures that the nuts (i.e., threads) of the first bolt 124 and second bolt 125 always face the opening at the top or bottom of the accommodating cavity 81, facilitating disassembly and assembly by workers.

[0075] Furthermore, the third connecting part 12 of this structure has the advantage of easy disassembly and assembly. Specifically, removing the first bolt 124 disconnects the connection between the third connecting part 12 and the intermediate push rod 4, and removing the second bolt 125 disconnects the connection between the third connecting part 12 and the piston rod of the clamping hydraulic cylinder 11. 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 bear a large shearing force. To avoid damage to the first bolt 124 and the second bolt 125, a more preferred embodiment of this invention is to configure the sleeve as including a straight pipe 121, two semi-circular plates 123, and connecting bolts 126, specifically:

[0076] Two opposing baffles 122 are protruding from the inner wall of the rear end of the straight tube 121, forming an insertion port between the two baffles 122. Two opposing stops are provided at the front end of the piston rod of the clamping hydraulic cylinder 11, forming a T-shaped head 111. The T-shaped head 111 is inserted into the straight tube 121 through the insertion port. When the straight tube 121 rotates 90°, the stops and baffles 122 come into contact, thus stacking the stops and baffles 122 together. Both the first and second screw holes are formed on the wall of the straight tube 121, and when the stops and baffles 122 are stacked together, both the first and second screw holes face the opening at the top or bottom of the receiving cavity 81. An annular groove 41 is provided on the circumferential sidewall of the intermediate push rod 4 near its rear end. Two semicircular plates 123 are both engaged in the annular groove 41, and the two semicircular plates 123 are joined together to form a complete circular plate. 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 into 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] With 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 contact between the front end of the piston rod of the 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 of the circular plate and the groove wall and the cooperation between the T-shaped head 111 and the baffle 122. In this way, the first bolt 124 and the second bolt 125 can be prevented from bearing 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 tube 121 90°, then remove the bolt connecting the clamping hydraulic cylinder 11 to the mounting plate 83, then pull the T-shaped head 111 out of the insertion port, so that the piston rod of the clamping hydraulic cylinder 11 is disconnected from the third connecting part 12, then take out the piston rod of the clamping hydraulic cylinder 11 from the through hole of the stepped plate 84, then remove the stepped 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 stepped hole of the mounting plate 83. It should be noted that the nuts of the bolts (not shown in the figure) that fasten the step plate 84 to the mounting plate 83 face rearward. In fact, a countersunk hole is also provided on the rear side of the step plate 84, and a threaded hole is provided on the mounting plate 83. The bolts connecting the step plate 84 and the mounting plate 83 pass through the countersunk hole and are screwed into the threaded hole on the mounting plate 83, with the bolt nuts recessed into the countersunk hole. Thus, when the clamping hydraulic cylinder 11 is removed, the bolt nuts are exposed, making it easier for workers to tighten the bolts and remove the step plate 84 from the mounting plate 83.

[0079] As can be seen from the above analysis, 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 all be easily disassembled and assembled on the equipment.

[0080] An optional implementation of this embodiment is as follows: The first connecting part 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 the other first locking pin 52. Alternatively, the first connecting part 5 can also be a coupling.

[0081] Specifically, the first chain plate 51 has 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. The insert block 31 has a first pin hole corresponding to the first hinge hole. The front end of the middle push rod 4 is fixed with an abutment 42. The abutment 42 has a second pin hole corresponding to the second hinge hole. One first locking pin 52 is inserted into the first hinge hole and the first pin hole, and the other first locking pin 52 is inserted into the second hinge hole and the second pin hole.

[0082] The first pin hole is a waist-shaped hole, and the abutment 42 abuts against the insert 31. In this way, all the thrust of the intermediate push rod 4 is directly transmitted to the insert 31 through the abutment 42, and then to the end push rod 3 through the insert 31, thus avoiding the first locking pin 52 from being pushed. 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. At this time, the very small pulling force is entirely borne by the first chain plate 51 and the first locking pin 52. In this way, the shear force borne by the first locking pin 52 when transmitting force can be greatly reduced, thus preventing the first locking 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 42. In this case, the abutment 42, the first chain plates 51 and the first locking pin 52 form a head assembly. The outer diameter of the head assembly is smaller than that of the intermediate push rod 4, so the head assembly can also slide in the wear-resistant copper sleeve in the synchronous beam 6.

[0084] An optional implementation of this embodiment is as follows: The two connecting parts include a second chain plate 101 and two second locking pins 102. A connecting rod 61 is integrally formed or welded to 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 pre-tensioning hydraulic cylinder 9 is connected to the second chain plate 101 via the other second locking pin 102. Specifically, the connecting rod 61 is provided on both sides of the rear end of the synchronous beam 6, and each connecting rod 61 is connected to one of the pre-tensioning hydraulic cylinders 9. Alternatively, the second connecting part 10 can also be a coupling.

[0085] Optionally, the second chain plate 101 has a third hinge hole and a fourth hinge hole, the connecting rod 61 has a third pin hole corresponding to the third hinge hole, and the piston rod of the pre-tightening hydraulic cylinder 9 has a fourth pin hole corresponding to the fourth hinge hole. One second locking pin 102 is inserted into the third hinge hole and the third pin hole, and the other second locking pin 102 is inserted into the fourth hinge hole and the fourth pin hole.

[0086] The aforementioned fourth hinge hole is an oblong hole, and the piston rod of the pre-tensioning hydraulic cylinder 9 abuts against the connecting rod 61. Thus, when the pre-tensioning hydraulic cylinder 9 applies a thrust, all the thrust of the pre-tensioning hydraulic cylinder 9 is directly transmitted to the connecting rod 61 through the piston rod, and finally transmitted to the aforementioned synchronous beam 6 through the connecting rod 61, without being transmitted to the aforementioned second chain plate 101 and second locking pin 102. When the pre-tensioning hydraulic cylinder 9 applies a pull, all the pull of the pre-tensioning hydraulic cylinder 9 drives the aforementioned synchronous beam 6 to retract through the second connecting part 10. At this time, the very small pull is entirely borne 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, and the second locking pin 102 can be prevented from breaking when transmitting axial force.

[0087] Example 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 Embodiment 1. Specifically, the position is the starting position of the end push rod 3. The method includes:

[0089] Step 1: Take a piece of board and place it between clamps 2 so that the board covers all 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 make the pre-tightening hydraulic cylinder 9 maintain pressure.

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

[0092] Step 4: Measure the distance between all third connecting parts 12 and the corresponding adjusting pads 13 from the opening of the mounting block 8, and obtain the measurement results. It should be noted that if the length of an end push rod 3 is shortened due to wear at the front end of the end push rod 3, then the distance between the third connecting part 12 corresponding to that end push rod 3 and the corresponding adjusting pad 13 will be larger when clamping.

[0093] Step 5: Based on the measurement results, replace the adjusting pads 13 with those of different thicknesses to ensure that the distance between all the third connecting parts 12 and the corresponding adjusting 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 distance between the third connecting part 12 and the corresponding adjusting pad 13 of that end push rod 3 is larger. At this time, it is necessary to replace the adjusting pad 13 with a thicker adjusting pad 13, so that the clamping hydraulic cylinder 11 corresponding to that end push rod 3 retracts with a shorter stroke and the corresponding third connecting part 12 abuts against the adjusting pad 13. At this time, the front end of that end push rod 3 retracts a smaller distance, while the normal end push rod 3 retracts a larger distance. In this way, all the end push rods 3 retract to the position where the front ends are flush after the clamping hydraulic cylinder 11 is depressurized.

[0094] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A plate clamping mechanism for an aluminum plate stretching machine, characterized in that, include: The clamp (2) and the end push rod (3) for pushing the clamp (2) are slidably mounted on the stretching head (1); The intermediate push rod (4) is connected to the end push rod (3) via the first connecting part (5); Synchronous beam (6) is slidably mounted on mounting frame (7). The intermediate push rod (4) is slidably mounted on synchronous beam (6). The rear end of synchronous beam (6) is provided with mounting block (8). The mounting block (8) is provided with accommodating cavity (81). The upper and lower ends of the accommodating cavity (81) are both through to form openings. A pre-tightening hydraulic cylinder (9) is installed on the mounting bracket (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); A clamping hydraulic cylinder (11) is installed on the mounting block (8). The piston rod of the clamping hydraulic cylinder (11) is connected to the intermediate push rod (4) through a third connecting part (12). The third connecting part (12) is placed in the receiving cavity (81). An adjusting pad (13) is detachably connected to the mounting block (8), and the adjusting pad (13) is installed between the third connecting part (12) and the inner wall of the receiving cavity (81); The mounting block (8) includes: The main block (82) is fixed to the rear end of the synchronous beam (6), and the main block (82) has a through opening that passes through its upper end, lower end and rear end; Mounting plate (83) is bolted 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). The adjusting pad (13) and the clamping hydraulic cylinder (11) are both bolted to the mounting plate (83). The step plate (84) has a stepped through hole in the mounting plate (83), and the step plate (84) is bolted and fixed in the stepped through hole. The step plate (84) has a through hole, and the piston rod of the clamping hydraulic cylinder (11) slides through the through hole. The outer diameter of the third connecting part (12) is larger than the diameter of the through hole and smaller than the diameter of the stepped through hole. The third connecting part (12) includes: The sleeve, the rear end of the intermediate push rod (4) and the front end of the piston rod of the clamping hydraulic cylinder (11) are all inserted into the sleeve; The first bolt (124) has a first threaded hole in the wall of the sleeve, and the intermediate push rod (4) has a first countersunk hole. The first bolt (124) is screwed into the first threaded hole and inserted into the first countersunk hole. The second bolt (125) has a second threaded hole in the wall of the sleeve and a second countersunk hole in the piston rod of the clamping hydraulic cylinder (11). The second bolt (125) is screwed into the second threaded hole and inserted into the second countersunk hole.

2. The plate clamping mechanism of the aluminum plate stretching machine according to claim 1, characterized in that, The sleeve includes: A straight tube (121) has a first screw hole and a second screw hole both opened on the tube wall of the straight tube (121). Two opposing baffles (122) are protruding on the inner wall of the rear end of the straight tube (121), and an insertion port is formed between the two baffles (122). The piston rod of the clamping hydraulic cylinder (11) has two opposing blocks at the front end to form a T-shaped head (111). The T-shaped head (111) is inserted into the straight tube (121) through the insertion port, and when the straight tube (121) rotates 90°, the blocks are in contact with the baffles (122). Two semicircular plates (123), the circumferential sidewall of the middle push rod (4) is provided with an annular groove (41) near its rear end, both semicircular plates (123) are engaged in the annular groove (41), and the two semicircular plates (123) are joined together to form a whole circular plate. Each of the semicircular plates (123) is bolted and fixed to the front end of the straight pipe (121) by a connecting bolt (126).

3. The plate clamping mechanism of the aluminum plate stretching machine according to any one of claims 1-2, characterized in that: The first connecting part (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 the other first locking pin (52).

4. The plate clamping mechanism of the aluminum plate stretching machine according to claim 3, characterized in that: The first chain plate (51) has a first hinge hole and a second hinge hole; The end push rod (3) has a plug (31) fixedly installed at its rear end. The plug (31) has a first pin hole corresponding to the first hinge hole. The middle part of the front end of the intermediate push rod (4) has an abutment (42) fixedly installed. The abutment (42) has a second pin hole corresponding to the second hinge hole. One of the first locking pins (52) is inserted into the first hinge hole and the first pin hole, and the other of the first locking pins (52) is inserted into the second hinge hole and the second pin hole. The first hinge hole is an oblong hole, and the abutment (42) abuts against the plug (31).

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

6. The plate clamping mechanism of the aluminum plate stretching machine according to any one of claims 1-2, characterized in that: The second connecting part (10) includes a second chain plate (101) and two second locking pins (102). The rear end of the synchronous beam (6) is also fixed 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). The piston rod of the pre-tightening hydraulic cylinder (9) is connected to the second chain plate (101) through the other second locking pin (102).

7. The plate clamping mechanism of the aluminum plate stretching machine according to claim 6, characterized in that: The second chain plate (101) is provided with a third hinge hole and a fourth hinge hole; The connecting rod (61) has a third pin hole corresponding to the third hinge hole, and the piston rod of the pre-tightening hydraulic cylinder (9) has a fourth pin hole corresponding to the fourth hinge hole. One second locking pin (102) is inserted into the third hinge hole and the third pin hole, and another second locking pin (102) is inserted into the fourth hinge hole and the fourth pin hole. The fourth hinge hole is an oblong hole, and the piston rod of the pre-tightening hydraulic cylinder (9) abuts against the connecting rod (61).

8. A push rod adjustment method for adjusting the position of the end push rod (3) of the plate clamping mechanism as described in any one of claims 1-7, characterized in that, include: Step 1: Take a piece of board and place it between the clamps (2) so that the board covers all the clamps (2); Step 2: Start the pre-tightening hydraulic cylinder (9) to push the synchronous beam (6) to drive the intermediate 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) to push the middle push rod (4) and the end push rod (3) forward again in sync, so that all clamps (2) further clamp the plate, and then make the clamping hydraulic cylinder (11) maintain pressure; Step 4: Measure the distance between all third connecting parts (12) and the corresponding adjusting pads (13) from the opening of the mounting block (8) to obtain the measurement results; Step 5: Based on the measurement results, replace the adjustment pads (13) with different thicknesses so that the distance 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