A multi-hole plate punching device for forging production and processing

Abstract

The utility model discloses a kind of multi-hole plate punching device for forging production and processing, comprising: base, first moving plate, second moving plate, lifting plate and punching mechanism;The upper end of base is horizontally provided with first moving plate movable along its width direction, the upper end of first moving plate is horizontally provided with second moving plate movable along the length direction of base, the upper of base is horizontally and liftably provided with lifting plate, which can be abutted on second moving plate, punching mechanism is provided on lifting plate, and punching mechanism comprises: punch seat and drill bit;The upper end of lifting plate is spaced and horizontally provided with two punch seats with adjustable spacing, and drill bit is vertically and rotatably provided on both, the multi-hole plate punching device for forging production and processing can accurately punch any position of plate, and multiple holes can be punched in plate at one time, improve punching efficiency and precision, also improve its flexibility and reliability of use.

Description

Technical Field

[0001] This utility model relates to the field of forging drilling technology, specifically to a perforated plate drilling device for forging production and processing. Background Technology

[0002] Forgings are workpieces or blanks obtained by forging and deforming metal billets. During the forging process, some forgings require one or more through holes.

[0003] A search revealed Chinese patent application number "CN202320010590.0", which discloses a forging production drilling device, including a base. A fixing component is installed on the upper surface of the base, and positioning seats are installed on both sides of the outer wall of the fixing component. A stop bar is installed on the inner side wall of the positioning seat. An electrical distribution box is installed at the edge of the upper surface of the base, and a bracket is passed through the top of the base. A support arm is installed at the top of the bracket, and a rotating shaft is installed at the top of the support arm. A rotary motor is installed at the bottom of one end of the support arm, and a drive motor is installed at the bottom of the other end of the support arm.

[0004] In the process of implementing this utility model, the inventors discovered the following problems with the existing technology: During use, the existing drilling device cannot automatically adjust the drilling position of the board to be processed. The board needs to be manually adjusted so that the opening device can open different positions of the board. Moreover, it can only drill one hole at a time, which reduces drilling efficiency and flexibility.

[0005] Therefore, the present invention urgently needs to solve the problem of providing a multi-hole plate drilling device for forging production and processing that can accurately drill at any position of the plate during use, and can drill multiple holes in the plate at one time, thereby improving drilling efficiency and accuracy, as well as its flexibility and reliability. Utility Model Content

[0006] To address the aforementioned technical problems, the purpose of this utility model is to overcome the limitations of existing technologies that cannot automatically adjust the drilling position of the sheet metal to be processed, requiring manual adjustment of the sheet metal to enable the opening device to open different positions of the sheet metal. Furthermore, these technologies can only drill one hole at a time, thus reducing drilling efficiency and flexibility. This invention provides a multi-hole plate drilling device for forging production and processing that can accurately drill at any position of the sheet metal during use, and can drill multiple holes at once, improving drilling efficiency and accuracy, as well as enhancing its flexibility and reliability.

[0007] To achieve the above objectives, this utility model provides a perforated plate drilling device for forging production and processing, the device comprising: a base, a first moving plate, a second moving plate, a lifting plate, and a drilling mechanism; The upper end of the base is horizontally provided with a first movable plate that can move along its width direction. Above the first movable plate is a second movable plate that can move along the length direction of the base. The second movable plate is provided with a clamp for holding the sheet material. Above the base is a horizontally mounted, liftable plate that can abut against the second movable plate. The lifting plate is provided with a drilling mechanism, which includes a drilling base and a drill bit. The upper end of the lifting plate is provided with two L-shaped drilling blocks with adjustable spacing, and each block is provided with a drill bit vertically and rotatably. The lifting plate is provided with a vertical through-hole for the two drill bits to pass through.

[0008] Preferably, the drilling mechanism further includes: a worm gear and a worm; wherein, Each drill bit has a worm gear fixedly mounted coaxially at its upper end, and each drilling block next to the worm gear has a worm that is horizontally and rotatably connected to the worm gear. One of the worms has a drive shaft fixedly mounted coaxially at its end, and at least one key is fixedly mounted horizontally on the drive shaft. The end portion of the other worm is recessed inward to form a drive cavity that matches the drive shaft, and the drive cavity is also recessed inward to form a keyway that cooperates with the key.

[0009] Preferably, the first moving plate is horizontally and movably disposed at the upper end of the base via a first moving mechanism, the first moving mechanism comprising: a moving base, a moving lead screw, and a moving slider; wherein, The upper end of the base is provided with two open-facing movable seats at intervals and fixed horizontally. Each movable seat is provided with a movable screw that is horizontally and rotatably installed inside. Each movable screw is provided with a movable slider whose top part extends out of the opening of the movable seat. The bottom of the first movable plate is horizontally fixed on the two movable sliders.

[0010] Preferably, the device further includes a power mechanism capable of synchronously driving the two movable lead screws to rotate, the power mechanism comprising: a power motor, a power sprocket, and a power chain; wherein, The same end of each of the two movable lead screws extends from the side wall of the two movable seats and is coaxially fixed with two power sprockets. The two power sprockets are connected together by a power chain. The end of any one of the movable lead screws is coaxially connected to a power motor that is horizontally fixed on the movable seat through a coupling.

[0011] Preferably, the second moving plate is horizontally and movably mounted on the first moving plate via a second moving mechanism, the second moving mechanism comprising: a toothed plate, a rotating shaft, and a gear; wherein, Two toothed plates are fixedly and horizontally at the bottom of the second moving plate. The first moving plate has a hollow structure, and a row of rotating shafts perpendicular to the two toothed plates are rotatably arranged horizontally and at equal intervals along its length. Two windows are opened on the first moving plate located directly below the two toothed plates. Two gears are coaxially and fixedly arranged at intervals on each rotating shaft, which can partially protrude from the two windows and mesh with the two toothed plates.

[0012] Preferably, the clamp includes: a first electric telescopic rod and a clamping plate; wherein, At least two electric telescopic rods are fixedly installed horizontally and at intervals on the upper end of the second movable plate, and two clamping plates close to each other are fixedly installed horizontally on the telescopic ends of the two rods. The upper part of the second movable plate is recessed inward to form an avoidance groove.

[0013] Preferably, an inverted L-shaped support is vertically fixed at the upper end of the base located next to the second movable plate, and a second electric telescopic rod is vertically fixed through the top of the support. A gantry frame is horizontally fixed on the lifting plate located above the drilling mechanism, and the telescopic end of the second electric telescopic rod is fixed on the gantry frame.

[0014] Preferably, guide rods are vertically fixed at the four corners of the upper end of the lifting plate, and guide holes are vertically opened on the support base for all the guide rods to pass through.

[0015] Preferably, the device further includes a spacing adjustment mechanism for adjusting the distance between the two punching blocks, the spacing adjustment mechanism comprising: an adjusting screw composed of two screws with opposite thread directions, an adjusting slider, and an adjusting motor; wherein, An adjusting screw is horizontally and rotatably installed inside the lifting plate. Its end is coaxially connected to an adjusting motor that is horizontally fixed inside the lifting plate via a coupling. Two adjusting sliders that are close to or far apart from each other are threadedly fixed on the adjusting screw. The upper end of the lifting plate is provided with a guide groove for the two adjusting sliders to pass through. The tops of the two adjusting sliders pass through the guide groove and are respectively fixed on the two punched seats.

[0016] According to the above technical solution, the beneficial effects of the perforated plate drilling device for forging production and processing provided by this utility model in use are as follows: (1) When in use, the board to be processed is placed horizontally on the second moving plate and clamped and fixed by the clamp. Then, according to the requirements, the distance between the two drilling blocks is adjusted by moving the two drilling blocks, thereby adjusting the distance between the two drill bits of the drilling mechanism. After the adjustment is completed, the drilling position of the board on the second moving plate is adjusted by moving the first moving plate and the second moving plate respectively. Thus, the drilling mechanism is driven to descend vertically by driving the lifting mechanism to accurately drill the board, thereby improving the drilling effect and drilling accuracy.

[0017] (2) By moving the first moving plate and the second moving plate respectively, the plate to be processed fixed on the second moving plate by the clamp can be moved, and the drilling mechanism can be used to drill holes at any position on the plate to be processed, which improves its flexibility. In addition, since the spacing between the multiple drill bits of the drilling mechanism is adjustable, the hole spacing of the plate can be adjusted to meet the different hole spacing requirements of customers.

[0018] This invention can precisely drill at any position on a board material and can drill multiple holes in one go, improving drilling efficiency and accuracy, as well as its flexibility and reliability.

[0019] Other features and advantages of this utility model will be described in detail in the following detailed description section; and all parts not covered in this utility model are the same as or can be implemented using existing technology. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a perforated plate punching device for forging production and processing provided in a preferred embodiment of this utility model; Figure 2 This is a front view of the structure of a perforated plate punching device for forging production and processing provided in a preferred embodiment of this utility model; Figure 3 This is an assembly diagram of the punching mechanism of the perforated plate punching device for forging production and processing provided in a preferred embodiment of the present invention. Figure 4 yes Figure 3 Top view of the structure in the AA direction.

[0021] Explanation of reference numerals in the attached figures 1. Base; 2. First moving plate; 3. Second moving plate; 4. Lifting plate; 5. Drilling mechanism; 501. Drilling seat; 502. Drill bit; 503. Worm gear; 504. Worm; 6. Support base; 7. First moving mechanism; 8. Second moving mechanism; 801. Gear plate; 802. Rotating shaft; 803. Gear; 9. Fixture; 901. First electric telescopic rod; 902. Clamping plate; 10. Second electric telescopic rod; 11. Guide rod; 12. Drive shaft; 13. Key; 14. Gantry frame; 15. Guide groove; 16. Strip hole; 17. Spacing adjustment mechanism. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] like Figure 1-4 As shown, the present invention provides a perforated plate punching device for forging production and processing, the device comprising: a base 1, a first moving plate 2, a second moving plate 3, a lifting plate 4, and a punching mechanism 5; A first movable plate 2, movable along its width, is horizontally arranged at the upper end of the base 1. A second movable plate 3, movable along the length of the base 1, is horizontally arranged above the first movable plate 2. A clamp 9 for holding the material is provided on the second movable plate 3. A lifting plate 4, capable of abutting against the second movable plate 3, is horizontally and vertically arranged above the base 1. A drilling mechanism 5 is provided on the lifting plate 4, which includes a drilling base 501 and a drill bit 502. The upper end of the lifting plate 4 is provided with two L-shaped punching bases 501 with adjustable spacing, and each of them is provided with a drill bit 502 vertically and rotatably. The lifting plate 4 is provided with a vertical through-hole 16 for the two drill bits 502 to pass through.

[0024] In the above scheme, the board to be processed is placed horizontally on the second moving plate 3 and clamped and fixed by the clamp 9. Then, according to the requirements, the distance between the two drilling bases 501 is adjusted by moving them, thereby adjusting the distance between the two drill bits 502 of the drilling mechanism 5. After adjustment, the drilling position of the board on the second moving plate 3 is adjusted by moving the first moving plate 2 and the second moving plate 3 respectively. Thus, the drilling mechanism 5 is driven to descend vertically by driving the lifting 4 to accurately drill holes in the board, thereby improving the drilling effect and drilling accuracy.

[0025] Furthermore, by moving the first moving plate 2 and the second moving plate 3 respectively, the material to be processed, which is fixed on the second moving plate 3 by the clamp 9, can be moved. This allows the drilling mechanism 5 to perform drilling operations at any position on the material to be processed, improving its flexibility. In addition, since the spacing between the multiple drill bits 502 of the drilling mechanism 5 is adjustable, the hole spacing for processing the material can be adjusted to meet the different hole spacing requirements of customers.

[0026] In a preferred embodiment of this utility model, the drilling mechanism 5 further includes: a worm gear 503 and a worm 504; wherein, Each drill bit 502 has a worm gear 503 coaxially fixed at its upper end, and each drilling base 501 located next to the worm gear 503 has a worm 504 horizontally and rotatably connected to the worm gear 503. One of the worm 504 has a drive shaft 12 coaxially fixed at its end, and at least one key 13 is horizontally fixed on the drive shaft 12. The end portion of the other worm 504 is recessed inward to form a transmission cavity adapted to the drive shaft 12, and the transmission cavity portion is recessed inward to form a keyway that cooperates with the key 13.

[0027] In the above scheme, a drive motor is horizontally fixed on any one of the punching bases 501, and the output shaft of the drive motor is coaxially connected to the worm gear 504 on the punching base 501 through a coupling.

[0028] In use, after driving the two drilling blocks 501 to move closer or further apart to adjust the distance between the two drill bits 502, the transmission shaft 12 and key 13 on one of the worm gears 605 cooperate with the transmission cavity and keyway inside the other worm gear 504. By simply starting the drive motor, the two worm gears 604 can be driven to rotate synchronously. During the synchronous rotation of the two worm gears 504, the two worm wheels 503 meshing with each other can drive the two drill bits 502 to rotate synchronously, so that the drilling mechanism 5 can drill multiple holes in the plate at once, improving drilling efficiency.

[0029] In a preferred embodiment of this utility model, the first moving plate 2 is horizontally and movably disposed on the upper end of the base 1 via a first moving mechanism 7, the first moving mechanism 7 comprising: a moving base, a moving lead screw, and a moving slider; wherein, The upper end of the base 1 is provided with two open-facing movable seats at intervals and fixed horizontally. Each movable seat is provided with a movable screw that is horizontal and rotatable inside. Each movable screw is provided with a movable slider whose top part extends out of the opening of the movable seat. The bottom of the first movable plate 2 is horizontally fixed on the two movable sliders.

[0030] In the above scheme, during use, the two moving lead screws are driven synchronously so that the two moving sliders on them can move synchronously along their respective axes, thereby driving the first moving plate 2 to move along the width direction of the base 1.

[0031] In a preferred embodiment of this utility model, the device further includes a power mechanism capable of synchronously driving two movable lead screws to rotate synchronously. The power mechanism includes: a power motor, a power sprocket, and a power chain; wherein, The same end of each of the two movable lead screws extends from the side wall of the two movable seats and is coaxially fixed with two power sprockets. The two power sprockets are connected together by a power chain. The end of any one of the movable lead screws is coaxially connected to a power motor that is horizontally fixed on the movable seat through a coupling.

[0032] In the above scheme, when in use, by starting the power motor, the two moving screws can be driven to rotate synchronously under the transmission action of the chain and sprocket, thereby driving the two moving sliders to move synchronously along their respective axes, thereby driving the first moving plate 2 to move along the width direction of the base 1.

[0033] In a preferred embodiment of this utility model, the second moving plate 3 is horizontally and movably mounted on the first moving plate 2 via a second moving mechanism 8. The second moving mechanism 8 includes: a toothed plate 801, a rotating shaft 802, and a gear 803; wherein, Two toothed plates 801 are fixedly and horizontally at the bottom of the second movable plate 3. The first movable plate 2 has a hollow structure, and a row of rotating shafts 802 perpendicular to the two toothed plates 801 are rotatably arranged horizontally and at equal intervals along its length. Two windows are opened on the first movable plate 2 located directly below the two toothed plates 801. Two gears 803 are coaxially and fixedly arranged at intervals on each rotating shaft 802, which can partially protrude from the two windows and mesh with the two toothed plates 801.

[0034] In the above scheme, the end of one of the rotating shafts 802 located in the middle of the first moving plate 2 extends from the side wall of the first moving plate 2 and is coaxially connected to the moving motor that is horizontally fixed on the first moving plate 2 via a coupling.

[0035] In use, the moving motor is activated to drive the rotating shaft 802, which is coaxially connected to it, to rotate. This causes the two gears 803 on the shaft to drive the two meshing toothed plates 801 to move the second moving plate 3 along the length of the base 1, moving the plate to be processed that is fixed on it by the clamp 9. The moving plate and the multiple gears 802 together provide support.

[0036] In a preferred embodiment of this utility model, the clamp 9 includes: a first electric telescopic rod 901 and a clamping plate 902; wherein, At least two electric telescopic rods 901 are fixedly and horizontally at a distance from each other on the upper end of the second movable plate 3, and two clamping plates 902 are fixedly and horizontally at their telescopic ends respectively. The upper part of the second movable plate 3 is recessed inward to form an avoidance groove.

[0037] In the above scheme, during use, the two electric telescopic rods 902 are driven to move the two clamping plates 902 closer or further apart to clamp or release the plates.

[0038] In addition, the avoidance groove is used to avoid the two drill bits 502 of the drilling mechanism 5, so that the two drill bits 502 will not pierce the plate after piercing the plate and thus avoid hitting the second moving plate 3.

[0039] In a preferred embodiment of this utility model, an inverted L-shaped support seat 6 is vertically fixed at the upper end of the base 1 located next to the second moving plate 3. A second electric telescopic rod 10 is vertically fixed through the top of the support seat 6. A gantry frame 14 is horizontally fixed on the lifting plate 4 located above the drilling mechanism 5. The telescopic end of the second electric telescopic rod 10 is fixed on the gantry frame 14.

[0040] In the above scheme, during use, the second electric telescopic rod 10 drives the gantry frame 14 to move the lifting plate 4 horizontally up and down in the vertical direction.

[0041] In addition, both the first electric telescopic rod 901 and the second electric telescopic rod 10 are pneumatic cylinders or servo electric cylinders.

[0042] In a preferred embodiment of this utility model, guide rods 11 are vertically fixed at the four corners of the upper end of the lifting plate 4, and guide holes for all the guide rods 11 to pass through are vertically through the support base 6.

[0043] In the above scheme, the multiple guide rods 11 and the multiple guide holes on the support base 6 are used to play a guiding role, thereby ensuring that the lifting plate 4 can move smoothly and reliably in a straight line in the vertical direction under the drive of the second electric telescopic rod 10.

[0044] In a preferred embodiment of this utility model, the device further includes a spacing adjustment mechanism 17 for adjusting the distance between the two punching bases 501. The spacing adjustment mechanism 17 includes: an adjusting screw composed of two screws with opposite thread directions, an adjusting slider, and an adjusting motor; wherein, An adjusting screw is horizontally and rotatably installed inside the lifting plate 4. Its end is coaxially connected to an adjusting motor that is horizontally fixed inside the lifting plate 4 via a coupling. Two adjusting sliders that are close to or far apart from each other are threadedly fixed on the adjusting screw. The upper end of the lifting plate 4 is provided with a guide groove 15 for the two adjusting sliders to pass through. The tops of the two adjusting sliders pass through the guide groove 15 and are respectively fixed on the two punching bases 501.

[0045] In the above scheme, during use, the adjusting motor is started to drive the adjusting screw to rotate, thereby driving the two adjusting sliders to move the two drilling blocks 501 closer or further apart along their axis to adjust the distance between the two drill bits 502.

[0046] In summary, the multi-hole plate drilling device for forging production and processing provided by this utility model overcomes the problems of existing technology, which cannot automatically adjust the drilling position of the plate to be processed, requires manual adjustment of the plate so that the opening device can open different positions of the plate, and can only drill one hole at a time, thus reducing drilling efficiency and flexibility.

[0047] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0049] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A perforated plate drilling device for forging production and processing, characterized in that, The device includes: a base (1), a first movable plate (2), a second movable plate (3), a lifting plate (4), and a punching mechanism (5); The upper end of the base (1) is horizontally provided with a first movable plate (2) that can move along its width direction. The upper end of the first movable plate (2) is horizontally provided with a second movable plate (3) that can move along the length direction of the base (1). The second movable plate (3) is provided with a clamp (9) for clamping the plate. The upper part of the base (1) is horizontally and vertically provided with a lifting plate (4) that can abut against the second movable plate (3). The lifting plate (4) is provided with a drilling mechanism (5). The drilling mechanism (5) includes: a drilling seat (501) and a drill bit (502); wherein, The upper end of the lifting plate (4) is provided with two L-shaped punching blocks (501) with adjustable spacing, and each of them is provided with a drill bit (502) vertically and rotatably. The lifting plate (4) is provided with a strip hole (16) through which the two drill bits (502) pass.

2. The perforated plate drilling device for forging production and processing according to claim 1, characterized in that, The drilling mechanism (5) further includes: a worm gear (503) and a worm (504); wherein, Each drill bit (502) has a worm gear (503) fixedly mounted on its upper end on an axle. Each drilling block (501) located next to the worm gear (503) has a worm (504) that meshes with the worm gear (503) horizontally and rotatably mounted on it. One of the worms (504) has a drive shaft (12) fixedly mounted on its end on an axle. At least one key (13) is fixedly mounted on the drive shaft (12) horizontally. The end portion of the other worm (504) is recessed inward to form a drive cavity that matches the drive shaft (12). The drive cavity portion is also recessed inward to form a keyway that works with the key (13).

3. The perforated plate drilling device for forging production and processing according to claim 1, characterized in that, The first movable plate (2) is horizontally and movably disposed on the upper end of the base (1) via a first movable mechanism (7), the first movable mechanism (7) comprising: a movable seat, a movable lead screw, and a movable slider; wherein, The upper end of the base (1) is provided with two open-facing movable seats at intervals and fixed horizontally. Each movable seat is provided with a movable screw that is horizontal and rotatable inside. Each movable screw is provided with a movable slider whose top part extends out of the opening of the movable seat. The bottom of the first movable plate (2) is fixed horizontally on the two movable sliders.

4. The perforated plate drilling device for forging production and processing according to claim 3, characterized in that, The device also includes a power mechanism capable of synchronously driving two movable lead screws to rotate, the power mechanism comprising: a power motor, a power sprocket, and a power chain; wherein, The same end of each of the two movable lead screws extends from the side wall of the two movable seats and is coaxially fixed with two power sprockets. The two power sprockets are connected together by a power chain. The end of any one of the movable lead screws is coaxially connected to a power motor that is horizontally fixed on the movable seat through a coupling.

5. The perforated plate drilling device for forging production and processing according to claim 1, characterized in that, The second moving plate (3) is horizontally and movably mounted on the first moving plate (2) via a second moving mechanism (8). The second moving mechanism (8) includes: a toothed plate (801), a rotating shaft (802), and a gear (803); wherein, Two toothed plates (801) are fixedly and horizontally at the bottom of the second movable plate (3). The first movable plate (2) has a hollow structure, and a row of rotating shafts (802) perpendicular to the two toothed plates (801) are rotatably arranged horizontally and at equal intervals along its length. Two windows are opened on the first movable plate (2) located directly below the two toothed plates (801). Two gears (803) are coaxially and fixedly arranged on each rotating shaft (802), which can partially protrude from the two windows and mesh with the two toothed plates (801).

6. The perforated plate drilling device for forging production and processing according to claim 1, characterized in that, The clamp (9) includes: a first electric telescopic rod (901) and a clamping plate (902); wherein, At least two electric telescopic rods (901) are fixedly and horizontally at the upper end of the second moving plate (3), and two clamping plates (902) are fixedly and horizontally at the telescopic ends of the two rods respectively. The upper part of the second moving plate (3) is recessed inward to form an avoidance groove.

7. The perforated plate drilling device for forging production and processing according to claim 1, characterized in that, A support seat (6) in the shape of an inverted L is vertically fixed at the upper end of the base (1) located next to the second moving plate (3). A second electric telescopic rod (10) is vertically fixed through the top of the support seat (6). A gantry frame (14) is horizontally fixed on the lifting plate (4) located above the drilling mechanism (5). The telescopic end of the second electric telescopic rod (10) is fixed on the gantry frame (14).

8. The perforated plate drilling device for forging production and processing according to claim 7, characterized in that, Guide rods (11) are vertically fixed at the four corners of the upper end of the lifting plate (4), and guide holes are vertically opened on the support base (6) for all the guide rods (11) to pass through.

9. The perforated plate drilling device for forging production and processing according to claim 1, characterized in that, The device also includes a spacing adjustment mechanism (17) for adjusting the distance between the two punching blocks (501), the spacing adjustment mechanism (17) comprising: an adjusting screw composed of two screws with opposite thread directions, an adjusting slider, and an adjusting motor; wherein, An adjusting screw is horizontally and rotatably installed inside the lifting plate (4). Its end is coaxially connected to an adjusting motor that is horizontally fixed inside the lifting plate (4) via a coupling. Two adjusting sliders that are close to or far apart from each other are threadedly fixed on the adjusting screw. A guide groove (15) is opened at the upper end of the lifting plate (4) for the two adjusting sliders to pass through. The tops of the two adjusting sliders pass through the guide groove (15) and are respectively fixed on the two punching seats (501).

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