A loading device for display glass plate processing

Abstract

The utility model discloses a kind of feeding devices for display glass plate processing, belong to display glass plate processing technical field, including mounting bracket, the inner top wall sliding installation of mounting bracket has support frame, the feeding piece for adsorbing feeding is provided on the support frame;The feeding piece includes the first cylinder installed on support frame, and the output of first cylinder is through support frame, the output of first cylinder is fixedly connected with lifting plate, the inner side sliding connection of support frame has the connecting plate below lifting plate, one end of the vertical rod that the connecting plate is fixedly connected with is through lifting plate, spring is fixedly connected between lifting plate and connecting plate. The utility model, telescopic bin of telescopic in feeding process can adjust the spacing of three suction cups, to adapt the spacing of glass plate in placing process, simultaneously, still can adjust the spacing of glass plate in placing to conveying belt, to improve the feeding effect and feeding efficiency of entire feeding device.

Description

Technical Field

[0001] This utility model relates to the field of display glass plate processing technology, and in particular to a feeding device for display glass plate processing. Background Technology

[0002] A monitor is a display tool that displays certain electronic files on a screen through a specific transmission device and then reflects them to the human eye. Different sizes of monitors are used in different scenarios. For example, smaller monitors are usually used in devices such as electronic watches and elevator screens.

[0003] The display glass, also known as the substrate, is a basic component of the display screen. It is a thin glass sheet with an extremely flat surface. Since the glass sheet needs to go through multiple processes during the production process, a feeding device is required to feed the glass sheet onto the conveyor belt and perform a series of processing on the glass sheet during the conveying process.

[0004] However, current feeding devices typically use suction cups to pick up glass plates neatly placed on a tray or in a placement device and place them onto a conveyor belt for feeding. However, this feeding method can only pick up one glass plate at a time, which affects the feeding efficiency of the glass plates. Therefore, a feeding device for display glass plate processing is proposed to solve the above problems. Utility Model Content

[0005] (a) Purpose of the utility model

[0006] To address the technical problems existing in the background art, this utility model proposes a feeding device for processing display glass plates. Through the feeding component on the support frame, multiple glass plates can be fed at one time, and the spacing between the glass plates during the feeding process is adjustable, which has the advantages of improving feeding efficiency and feeding effect.

[0007] (II) Technical Solution

[0008] This utility model provides a feeding device for processing display glass plates, including a mounting frame, a support frame slidably mounted on the inner top wall of the mounting frame, and a feeding component for adsorbing and feeding the material on the support frame;

[0009] The feeding component includes a first cylinder mounted on a support frame, with the output end of the first cylinder penetrating the support frame. A lifting plate is fixedly connected to the output end of the first cylinder. A connecting plate located below the lifting plate is slidably connected to the inner side of the support frame. A vertical rod with one end penetrating the lifting plate is fixedly connected to the connecting plate. A spring is fixedly connected between the lifting plate and the connecting plate. A telescopic chamber is installed below the connecting plate. A suction cup is connected to the lower part of the telescopic chamber. An air pump is connected to the upper part of the telescopic chamber. A dual-axis motor is fixedly installed below the connecting plate. A set of protrusions is fixedly connected to the side of the telescopic chamber near the dual-axis motor. An adjusting screw penetrating the protrusions is fixedly connected to the output shaft of the dual-axis motor.

[0010] The inner top wall of the mounting frame is provided with a drive component that allows for horizontal and lateral adjustment of the drive support frame.

[0011] The mounting frame contains a support member that holds the glass plate below the support frame.

[0012] Preferably, the telescopic chamber consists of a sleeve chamber and two connecting chambers. The sleeve chamber is fixedly installed below the connecting plate, and the two connecting chambers are slidably connected inside the sleeve chamber, with the openings of the connecting chambers located inside the sleeve chamber. The number of suction cups is three, and the three suction cups are respectively connected to the lower parts of the sleeve chamber and the connecting chambers.

[0013] Preferably, a set of the protrusions is fixedly connected to the side of the connecting chamber near the dual-axis motor. The protrusions are provided with a first threaded hole, and the first threaded hole is adapted to the thread on the outside of the adjusting screw.

[0014] Preferably, the driving component includes a driving screw rotatably connected to the inner side of the mounting bracket and having one end penetrating through the mounting bracket. A driving block is threaded onto the driving screw. A servo motor is fixedly mounted on one side of the mounting bracket, and the output shaft of the servo motor is fixedly connected to the end of the driving screw that penetrates through the mounting bracket. A crossbar penetrating the driving block is fixedly connected to the inner side of the mounting bracket.

[0015] Preferably, the drive block has a second threaded hole, which is adapted to the thread on the outside of the drive screw. The drive component also includes an electric push rod installed on the back of the drive block. The output shaft of the electric push rod is fixedly connected to a push plate that passes through the drive block, and a support frame is fixedly connected to one end of the push plate that passes through the drive block. The air pump is installed below the drive block.

[0016] Preferably, the support includes a support plate fixedly connected to the inner side of the mounting frame and located below the support frame. The support plate is cross-shaped, and a groove is formed on its upper front surface. A top plate is slidably connected in the groove. A set of stop bars is fixedly installed on the upper rear surface of the support plate and in the groove. The set of stop bars on the front side penetrates through the top plate. Each set of stop bars consists of four bars, which are arranged in a cross shape. An electric telescopic rod is fixedly installed on the lower front surface of the support plate, and the output end of the electric telescopic rod penetrates through the support plate and is fixedly connected to the top plate.

[0017] Preferably, the support further includes a column fixedly connected to the middle of the support plate and located between the two sets of stop bars. A rotating motor is fixedly installed on the inner side of the column. The output shaft of the rotating motor is fixedly connected to a support base. A second cylinder is fixedly installed on the back of the support base, and the output end of the second cylinder passes through the support base. A push block is fixedly connected to the output end of the second cylinder. A set of clamping blocks is hinged to the front side of the support base. A hinge rod with one end hinged to the clamping block is hinged to the front side of the push block. A set of L-shaped support blocks is fixedly connected below each clamping block.

[0018] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0019] 1. The glass plate processing feeding device for the display uses a first cylinder to drive a lifting plate, which in turn drives the telescopic chamber and suction cups on the connecting plate to lift and adsorb the glass plate. In conjunction with the lateral and forward and backward driving adjustment of the driving components, the adsorbed and fixed glass plate is driven onto the conveyor belt for feeding. During the feeding process, the telescopic chamber can adjust the spacing of the three suction cups to match the spacing of the glass plate during placement. At the same time, it can also adjust the spacing of the glass plate on the conveyor belt to improve the feeding effect and efficiency of the entire feeding device.

[0020] 2. The vertical rod and spring located between the lifting plate and the connecting plate of the display glass plate feeding device can provide elastic support for the connecting plate, so that the suction cup on the telescopic chamber can make flexible contact during the process of adsorbing and fixing the glass plate, thereby reducing the damage to the glass plate during the feeding process and further improving the feeding effect.

[0021] 2. The glass plate feeding device for display processing uses a clamping block and a support block driven by a second cylinder, along with an empty pallet raised by an electric telescopic rod through the top plate, to clamp, rotate, and remove the empty pallet without manual handling, thus further improving the glass plate feeding efficiency. Attached Figure Description

[0022] Figure 1 This is a perspective view of the overall structure of this utility model;

[0023] Figure 2This is a schematic diagram showing the connection between the feeding component and the driving component of this utility model.

[0024] Figure 3 This is a three-dimensional sectional view of the support structure of this utility model.

[0025] Reference numerals: 1. Mounting frame; 2. Support frame; 3. Feeding component; 31. First cylinder; 32. Lifting plate; 33. Connecting plate; 34. Vertical rod; 35. Spring; 36. Telescopic chamber; 37. Protrusion; 38. Dual-axis motor; 39. Suction cup; 310. Adjusting screw; 311. Air pump; 4. Driving component; 41. Driving block; 42. Driving screw; 43. Horizontal bar; 44. Servo motor; 45. Electric push rod; 46. Push plate; 5. Support component; 51. Support plate; 52. Groove; 53. Top plate; 54. Stop bar; 55. Electric telescopic rod; 56. Column; 57. Rotating motor; 58. Support base; 59. Second cylinder; 510. Push block; 511. Hinge rod; 512. Clamping block; 513. Support block. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, such as welding, riveting, or bonding; it can also be a detachable connection, such as threaded connection, keyed connection, or pin connection; or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figure 1-3 As shown, the present invention proposes a feeding device for processing display glass plates, including a mounting frame 1, a support frame 2 slidably mounted on the inner top wall of the mounting frame 1, and a feeding component 3 for adsorbing and feeding the material on the support frame 2.

[0030] In this invention, multiple glass plates can be fed at once using the feeding component 3 on the support frame 2, and the spacing between the glass plates during the feeding process is adjustable.

[0031] In an optional embodiment, the feeding component 3 includes a first cylinder 31 mounted on the support frame 2, and the output end of the first cylinder 31 passes through the support frame 2. The output end of the first cylinder 31 is fixedly connected to a lifting plate 32. A connecting plate 33 located below the lifting plate 32 is slidably connected to the inner side of the support frame 2. A vertical rod 34 with one end passing through the lifting plate 32 is fixedly connected to the connecting plate 33. A spring 35 is fixedly connected between the lifting plate 32 and the connecting plate 33. A telescopic chamber 36 is installed below the connecting plate 33. A suction cup 39 is connected to the lower part of the telescopic chamber 36. An air pump 311 is connected to the telescopic chamber 36. A dual-axis motor 38 is fixedly mounted below the connecting plate 33. A set of protrusions 37 is fixedly connected to the side of the telescopic chamber 36 near the dual-axis motor 38. An adjusting screw 310 passing through the protrusions 37 is fixedly connected to the output shaft of the dual-axis motor 38.

[0032] The inner top wall of the mounting bracket 1 is provided with a drive support bracket 2 and a drive component 4 that can be adjusted horizontally, laterally, and backward.

[0033] In this embodiment, the first cylinder 31 drives the lifting plate 32 to move the telescopic chamber 36 and suction cup 39 on the connecting plate 33 to lift and adsorb the glass plate. In conjunction with the lateral and front-back driving adjustment of the driving component 4, the adsorbed and fixed glass plate is driven to the conveyor belt for feeding. During the feeding process, the telescopic chamber 36 can adjust the spacing of the three suction cups 39 to match the spacing of the glass plate during the placement process. At the same time, it can also adjust the spacing of the glass plate placed on the conveyor belt to improve the feeding effect and feeding efficiency of the entire feeding device.

[0034] It should be noted that the telescopic chamber 36 consists of a sleeve chamber and two connecting chambers. The sleeve chamber is fixedly installed below the connecting plate 33, and the two connecting chambers are slidably connected inside the sleeve chamber. The opening of the connecting chamber is located inside the sleeve chamber. There are three suction cups 39, and the three suction cups 39 are respectively connected to the lower part of the sleeve chamber and the connecting chamber, so that the telescopic adjustable connecting chamber can adjust the spacing of the three suction cups 39.

[0035] The air inlet of the air pump 311 is connected to the sleeve on the telescopic chamber 36 via a hose, so that the air pump 311 will not interfere with the lifting and lowering of the telescopic chamber 36 during the process of pumping vacuum into the telescopic chamber 36. In addition, a sealing ring is embedded on the outer surface of the connecting chamber located on the inner side of the sleeve to improve the sealing performance of the connection between the connecting chamber and the sleeve.

[0036] One set of protrusions 37 are fixedly connected to the side of the connecting compartment near the dual-axis motor 38. The protrusions 37 have a first threaded hole, which is adapted to the thread on the outside of the adjusting screw 310. This allows the adjusting screw 310 driven by the dual-axis motor 38 to adjust the distance between the two protrusions 37, thereby enabling the telescopic compartment 36 to be telescopically adjusted. The dual-axis motor 38 is a servo motor.

[0037] In an optional embodiment, the drive component 4 includes a drive screw 42 rotatably connected to the inside of the mounting bracket 1 and having one end penetrating through the mounting bracket 1. A drive block 41 is threaded onto the drive screw 42. A servo motor 44 is fixedly mounted on one side of the mounting bracket 1, and the output shaft of the servo motor 44 is fixedly connected to the end of the drive screw 42 that penetrates through the mounting bracket 1. A crossbar 43 that penetrates through the drive block 41 is fixedly connected to the inside of the mounting bracket 1.

[0038] It should be noted that the drive block 41 has a second threaded hole, and the second threaded hole is compatible with the thread on the outside of the drive screw 42, so that the rotating drive screw 42 can adjust the drive block 41 to be horizontally adjusted on the crossbar 43.

[0039] The drive unit 4 also includes an electric push rod 45 installed on the back of the drive block 41. The output shaft of the electric push rod 45 is fixedly connected to a push plate 46 that passes through the drive block 41, and the support frame 2 is fixedly connected to one end of the push plate 46 that passes through the drive block 41. The air pump 311 is installed below the drive block 41.

[0040] In this embodiment, after the servo motor 44 is started and drives the drive screw 42 to rotate back and forth, it can drive the drive block 41 through the crossbar 43 to adjust horizontally within the mounting frame 1. When the electric push rod 45 on the drive block 41 moves horizontally back and forth by pushing and pulling the push plate 46, it can drive the support frame 2 to move back and forth accordingly, thereby driving the telescopic chamber 36 and the suction cup 39 below the support frame 2 to adjust horizontally back and forth as well as horizontally.

[0041] In an optional embodiment, the mounting frame 1 is provided with a support member 5 for placing a glass plate below the support frame 2; the support member 5 includes a support plate 51 fixedly connected to the inner side of the mounting frame 1 and located below the support frame 2. The support plate 51 is cross-shaped, and a groove 52 is provided on its front upper surface. A top plate 53 is slidably connected in the groove 52. A set of stop bars 54 are fixedly installed on the rear upper surface of the support plate 51 and in the groove 52. The front set of stop bars 54 penetrates the top plate 53. There are four stop bars 54 in each set, and the four stop bars 54 are distributed in a cross shape. An electric telescopic rod 55 is fixedly installed on the front lower surface of the support plate 51, and the output end of the electric telescopic rod 55 penetrates the support plate 51 and is fixedly connected to the top plate 53.

[0042] In this embodiment, the front set of baffles 54 can be used to block the trays or placement devices containing glass plates, so that the trays or placement devices containing glass plates can be stacked on top of the top plate 53. The descending suction cups 39 can then adsorb and support the placed glass plates. After the glass plates in each tray or placement device are loaded, the activated electric telescopic rod 55 can push the stacked trays or placement devices upward, so that the empty trays or placement devices are exposed from the front set of baffles 54 and are no longer blocked by the front set of baffles 54.

[0043] In an optional embodiment, the support member 5 further includes a column 56 fixedly connected to the middle of the support plate 51 and located between two sets of stop bars 54. A rotating motor 57 is fixedly installed on the inner side of the column 56. The output shaft of the rotating motor 57 is fixedly connected to a support base 58. A second cylinder 59 is fixedly installed on the back of the support base 58, and the output end of the second cylinder 59 passes through the support base 58. A push block 510 is fixedly connected to the output end of the second cylinder 59. A set of clamping blocks 512 is hinged to the front side of the support base 58. A hinge rod 511 with one end hinged to the front side of the push block 510 is hinged to the front side of the clamping block 512. A set of L-shaped support blocks 513 are fixedly connected below each clamping block 512.

[0044] In this embodiment, once the empty tray or placement device is exposed above the front set of baffles 54 and is no longer blocked by them, the activated second cylinder 59 can pull the hinge rod 511 via the push block 510, causing a set of clamping blocks 512 to rotate and retract. The empty tray or placement device is then hooked and clamped by a set of support blocks 513 on each clamping block 512. The randomly activated rotary motor 57 drives the support base 58 to rotate 180 degrees, which rotates the empty tray or placement device into the rear set of baffles 54. This resets the second cylinder 59, causing the clamping blocks 512 to release the empty tray or placement device and fall into the rear set of baffles 54, thus completing the automatic retrieval of the empty tray or placement device.

[0045] The working principle in the above embodiments is as follows:

[0046] After the servo motor 44 is started and drives the drive screw 42 to rotate back and forth, it can drive the drive block 41 through the crossbar 43 to adjust horizontally within the mounting frame 1. When the electric push rod 45 on the drive block 41 moves horizontally back and forth by pushing and pulling the push plate 46, it can drive the support frame 2 to move back and forth accordingly. This can drive the telescopic chamber 36 and suction cup 39 below the support frame 2 to adjust horizontally back and forth. Therefore, the first cylinder 31 drives the lifting plate 32 to lower the telescopic chamber 36 and suction cup 39 on the connecting plate 33 to abut and adsorb the glass plate. After the first cylinder 31 is reset and the fixed glass plate is raised, the servo motor 44 and the drive screw 42 can then feed the adsorbed and fixed glass plate onto the conveyor belt.

[0047] During the loading process, the dual-axis motor 38, which is started, can drive a set of connecting chambers on the telescopic chamber 36 to extend and retract through the protrusion 37. After adjusting the spacing of the set of connecting chambers, the spacing of the three suction cups 39 can be adjusted to accommodate the different spacing of several glass plates during the placement process. At the same time, the spacing of the glass plates placed on the conveyor belt can also be adjusted so that the glass plates can be transported at better intervals. When the glass plates in each row are loaded, the electric push rod 45 can be started to push the support frame 2 forward through the push plate 46, thereby driving the suction cups 39 forward to suction and load the glass plates in the next row. This process continues until the glass plates placed on each tray or placement device are loaded, at which point they can be removed.

[0048] The front set of baffles 54 can be used to block the trays or placement devices containing glass plates, allowing them to be stacked on top of the top plate 53. The descending suction cups 39 can then hold and support the glass plates. After each tray or placement device containing glass plates has been loaded, the activated electric telescopic rod 55 can push the stacked trays or placement devices upward, exposing the empty trays or placement devices to the front set of baffles 54, thus removing them from the obstruction.

[0049] When an empty pallet or placement device is removed, the empty pallet or placement device exposes the front set of stops 54. Once it is no longer blocked by the front set of stops 54, the activated second cylinder 59 can pull the hinge rod 511 through the push block 510, causing a set of clamping blocks 512 to rotate and retract. The empty pallet or placement device is then held and fixed by a set of support blocks 513 on each clamping block 512. The randomly activated rotary motor 57 drives the support base 58 to rotate 180 degrees, which rotates the empty pallet or placement device into the rear set of stops 54. The second cylinder 59 is then reset, causing the clamping blocks 512 to release the empty pallet or placement device and fall into the rear set of stops 54, thus completing the automatic retrieval of the empty pallet or placement device.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A feeding device for processing display glass panels, comprising a mounting frame (1), characterized in that: The inner top wall of the mounting frame (1) is slidably fitted with a support frame (2), and the support frame (2) is provided with a feeding component (3) for adsorbing and feeding materials. The feeding component (3) includes a first cylinder (31) mounted on a support frame (2), and the output end of the first cylinder (31) passes through the support frame (2). A lifting plate (32) is fixedly connected to the output end of the first cylinder (31). A connecting plate (33) located below the lifting plate (32) is slidably connected to the inner side of the support frame (2). A vertical rod (34) with one end passing through the lifting plate (32) is fixedly connected to the connecting plate (33). A connection is fixedly made between the lifting plate (32) and the connecting plate (33). A spring (35) is installed below the connecting plate (33), a telescopic chamber (36) is installed below the telescopic chamber (36), a suction cup (39) is connected to the lower part of the telescopic chamber (36), an air pump (311) is connected to the upper part of the telescopic chamber (36), a dual-axis motor (38) is fixedly installed below the connecting plate (33), a set of protrusions (37) is fixedly connected to the side of the telescopic chamber (36) near the dual-axis motor (38), and an adjusting screw (310) that passes through the protrusions (37) is fixedly connected to the output shaft of the dual-axis motor (38). The inner top wall of the mounting bracket (1) is provided with a drive support bracket (2) and a drive component (4) that can be adjusted horizontally and backward. The mounting bracket (1) is provided with a support member (5) for placing a glass plate below the support frame (2).

2. The feeding device for processing display glass plates according to claim 1, characterized in that, The telescopic chamber (36) consists of a sleeve chamber and two connecting chambers. The sleeve chamber is fixedly installed below the connecting plate (33). The two connecting chambers are slidably connected inside the sleeve chamber, and the opening of the connecting chamber is located inside the sleeve chamber. There are three suction cups (39), and the three suction cups (39) are respectively connected to the bottom of the sleeve chamber and the connecting chamber.

3. The feeding device for processing display glass plates according to claim 2, characterized in that, A set of the protrusions (37) are fixedly connected to the side of the connecting chamber near the dual-axis motor (38). The protrusions (37) have a first threaded hole, which is adapted to the thread on the outside of the adjusting screw (310).

4. The feeding device for processing display glass plates according to claim 1, characterized in that, The driving component (4) includes a driving screw (42) rotatably connected to the inside of the mounting bracket (1) and having one end penetrating through the mounting bracket (1). A driving block (41) is threaded onto the driving screw (42). A servo motor (44) is fixedly mounted on one side of the mounting bracket (1), and the output shaft of the servo motor (44) is fixedly connected to one end of the driving screw (42) penetrating through the mounting bracket (1). A crossbar (43) penetrating through the driving block (41) is fixedly connected to the inside of the mounting bracket (1).

5. The feeding device for processing display glass plates according to claim 4, characterized in that, The drive block (41) has a second threaded hole, which is adapted to the thread on the outside of the drive screw (42). The drive component (4) also includes an electric push rod (45) installed on the back of the drive block (41). The output shaft of the electric push rod (45) is fixedly connected to a push plate (46) that passes through the drive block (41). The support frame (2) is fixedly connected to one end of the push plate (46) that passes through the drive block (41). The air pump (311) is installed below the drive block (41).

6. The feeding device for processing display glass plates according to claim 1, characterized in that, The support member (5) includes a support plate (51) fixedly connected to the inner side of the mounting frame (1) and located below the support frame (2). The support plate (51) is cross-shaped, and a groove (52) is provided on the upper surface of its front side. A top plate (53) is slidably connected in the groove (52). A set of stop bars (54) are fixedly installed on the upper surface of the rear side of the support plate (51) and in the groove (52). The set of stop bars (54) on the front side penetrates the top plate (53). The number of each set of stop bars (54) is four, and the four stop bars (54) are distributed in a cross shape. An electric telescopic rod (55) is fixedly installed on the lower surface of the front side of the support plate (51), and the output end of the electric telescopic rod (55) penetrates the support plate (51) and is fixedly connected to the top plate (53).

7. The feeding device for processing display glass plates according to claim 6, characterized in that, The support member (5) also includes a column (56) fixedly connected to the middle of the support plate (51) and located between two sets of baffles (54). A rotating motor (57) is fixedly installed on the inner side of the column (56). The output shaft of the rotating motor (57) is fixedly connected to a support base (58). A second cylinder (59) is fixedly installed on the back of the support base (58), and the output end of the second cylinder (59) passes through the support base (58). A push block (510) is fixedly connected to the output end of the second cylinder (59). A set of clamping blocks (512) is hinged to the front side of the support base (58). A hinge rod (511) with one end hinged to the front side of the push block (510) is hinged to the front side. A set of L-shaped support blocks (513) is fixedly connected to the bottom of each clamping block (512).

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