Miniature rivet continuous riveting apparatus

Abstract

The application provides a micro rivet continuous riveting equipment, which comprises a support plate, a first support frame and a second support frame are arranged on the support plate, a vibration disc is arranged above the first support frame, a guide groove is connected to an output end of the vibration disc, an adjusting mechanism is connected to a tail end of the guide groove, a feeding plate is arranged above the second support frame, a mounting plate is arranged on the feeding plate, a sliding module is arranged on the mounting plate, an adsorption plate is arranged on a sliding block of the sliding module, an adsorption tube is arranged on the adsorption plate, a pushing mechanism is arranged in the adsorption tube, a positioning mechanism is arranged on an adsorption end of the adsorption tube, a riveting mechanism and a detection mechanism are sequentially arranged at a subsequent working station of an adsorption mechanism of the feeding plate, and at least one set of positioning mechanisms are arranged on the second support frame, so that the problems in the prior art, such as the rivet being easy to be skewed, unable to be grabbed, the soft suction head being poor in accuracy and the rivets being adhered, are solved.

Description

Technical Field

[0001] This invention relates to a silver dot riveting device, and more particularly to a micro rivet continuous riveting device. Background Technology

[0002] To improve conductivity, terminals typically require silver dots to be riveted to their connection points. Traditionally, there are two riveting methods: manual riveting, which suffers from low efficiency, poor quality, and high labor intensity; and automated riveting, where a suction mechanism picks up the rivet and then rivets the silver dot. However, when using miniature round-head rivets, both methods often result in problems such as rivet misalignment during placement, difficulty in gripping, and inaccurate accuracy and rivet adhesion with existing soft suction heads. Therefore, a continuous miniature rivet riveting device is urgently needed to solve these problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a micro-rivet continuous riveting device, comprising a support plate on which a first support frame and a second support frame are mounted. A vibratory feeder is mounted above the first support frame, and a guide groove is connected to the output end of the vibratory feeder. An adjustment mechanism is connected to the end of the guide groove. A feeding plate is mounted above the second support frame, and an mounting plate is mounted on the feeding plate. An adsorption sliding module is mounted on the mounting plate, and an adsorption mechanism is mounted on the slider of the adsorption sliding module. The adsorption mechanism can be moved above the adjustment mechanism via the adsorption sliding module. The adsorption mechanism includes an adsorption plate mounted on the slider of the adsorption sliding module, an adsorption cylinder mounted on the adsorption plate, an adsorption tube mounted on the transmission end of the adsorption cylinder, and an adsorption end of the adsorption tube pointing towards the feeding plate. A pushing mechanism is mounted inside the adsorption tube, and a positioning mechanism is mounted on the adsorption end of the adsorption tube. A riveting mechanism, a detection mechanism, and a substrate feeding mechanism are sequentially mounted on the subsequent workstations of the adsorption mechanism on the feeding plate. At least one set of positioning mechanisms is mounted on the second support frame.

[0004] Preferably, the adjustment mechanism includes an adjustment cylinder mounted on the first support frame, an adjustment block connected to the transmission end of the adjustment cylinder, the adjustment block being slidably connected to the first support frame via a slide rail mechanism, and an adsorption hole being provided above the adjustment block.

[0005] Preferably, the alignment mechanism includes a contour block connected to the lower end of the adsorption tube, the contour block being connected to the adsorption tube, a plurality of rotating shafts being provided on the inner wall of the contour block, an alignment torsion spring being sleeved on the rotating shaft, and a push plate being connected to the alignment torsion spring.

[0006] Preferably, the pushing mechanism includes a sliding sleeve disposed on the inner wall of the adsorption tube. The sliding sleeve is fixed inside the adsorption tube by a connecting rod. A pushing block is slidably connected inside the sliding sleeve. A one-way hole is disposed inside the pushing block. A return spring is disposed at the top of the one-way hole. A cap-shaped block is disposed at the other end of the return spring. The cap-shaped block is slidably connected inside the one-way hole. A blocking block is disposed on the inner side of the bottom end of the pushing block. A connecting film is disposed at the bottom end of the sliding sleeve. The other end of the connecting film is connected to the inner wall of the contour block.

[0007] Preferably, the cap-shaped block includes a bottom ring that is slidably connected to the cap-shaped block, a connecting sleeve is provided below the bottom ring, a circular cover plate is provided below the connecting sleeve, an air inlet is provided on the connecting sleeve, and a guide slope is provided on the outer edge of the circular cover plate, the guide slope can be pressed onto the blocking block.

[0008] Preferably, the riveting mechanism includes a push cylinder disposed above the feed plate, a riveting plate connected to the drive end of the push cylinder, a riveting post connected to the riveting plate, a rivet groove provided at the bottom end of the riveting post, and a lifting mechanism disposed below the riveting mechanism.

[0009] Preferably, the lifting mechanism includes a lifting cylinder mounted on the second support frame, the transmission end of the lifting cylinder pointing towards the riveting post, a reciprocating block mounted above the lifting cylinder, a riveting post mounted on the upper end of the reciprocating block, and at least one set of riveting springs mounted around the riveting post, with both ends of the riveting springs connected to the feed plate and the reciprocating block respectively.

[0010] Preferably, the detection mechanism includes a detection plate disposed on the feed plate, a detection cylinder disposed on the detection plate, a detection block connected to the transmission end of the detection cylinder, a first detection protrusion and a second detection protrusion disposed on the detection block, a detection needle passing through the first detection protrusion and the second detection protrusion, a detection ring disposed on the outer edge of the detection needle, a detection spring sleeved on the detection needle, and the two ends of the detection spring being respectively connected to the detection ring and the first detection protrusion.

[0011] Preferably, the positioning mechanism includes a positioning plate disposed above the feed plate, a positioning cylinder disposed on the positioning plate, a positioning column connected to the transmission end of the positioning cylinder, and the positioning column pointing towards the feed plate.

[0012] Preferably, the substrate feeding mechanism includes a feeding sliding module disposed on the second support frame, a feeding plate connected to the slider of the feeding sliding module, a connecting plate disposed on the feeding plate, a feeding cylinder disposed on the connecting plate, the driving end of the feeding cylinder pointing to the feeding plate, and a pressing block connected to the driving end of the feeding cylinder.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This invention improves upon the traditional adsorption mechanism by eliminating the soft suction head of the existing adsorption mechanism and using a high-precision contour block as the adsorption suction head, thus overcoming the problems of difficulty in gripping rivets and insufficient gripping accuracy.

[0015] 2. This invention sets a feeding method so that the round-headed screw is fed with the round head facing upwards, preventing the rivet from tilting due to the round head facing downwards during the feeding process. At the same time, it sets an adjustment mechanism and uses high-precision equipment such as a track to ensure that the error is controlled to less than 3 microns on one side during the adsorption process, which is a significant improvement compared to the traditional error of about 10 microns on one side.

[0016] 3. This invention effectively improves the accuracy of rivet suction by designing and improving the adsorption mechanism. The positioning mechanism fixes the position of the screw after suction, and the push mechanism prevents the rivet from sticking to the contour block after suction, thus improving processing efficiency and preventing phenomena such as mis-suction and gaps. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the adjustment mechanism of the present invention;

[0020] Figure 3 This is a schematic diagram of the riveting mechanism of the present invention;

[0021] Figure 4 This is a schematic diagram of the testing mechanism of the present invention;

[0022] Figure 5 This is a schematic diagram of the substrate feeding mechanism of the present invention;

[0023] Figure 6 This is a schematic diagram of the positioning mechanism of the present invention;

[0024] Figure 7 This is a schematic diagram of the adsorption end of the adsorption head of the present invention during adsorption;

[0025] Figure 8 This is a schematic diagram of the adsorption head pushing out the rivet at the adsorption end of the present invention;

[0026] Figure 9 This is a schematic diagram of the push mechanism of the present invention;

[0027] Figure 10 This is a schematic diagram of the cap-shaped block of the present invention;

[0028] Figure 11 This is a schematic diagram of the orthogonal mechanism of the present invention;

[0029] Among them, 1. Support plate; 101. First support frame; 102. Second support frame; 103. Vibrating plate; 104. Guide groove; 105. Feed plate; 106. Mounting plate; 107. Adsorption sliding module; 108. Adsorption plate; 109. Adsorption cylinder; 110. Adsorption tube; 2. Adjustment mechanism; 201. Adjustment cylinder; 202. Adjustment block; 203. Slide rail mechanism; 204. Adsorption hole; 3. Pushing mechanism; 301. Sliding sleeve; 302. Pushing block; 303. One-way hole; 304. Return spring; 305. Blocking block; 306. Connecting film; 307. Connecting rod; 4. Positioning mechanism; 401. Contouring block; 402. Rotating shaft; 403. Positioning torsion spring; 404. Pushing plate; 5. Riveting mechanism; 501. Pushing cylinder; 502. Riveting plate; 503. 504. Riveting post; 505. Rivet groove; 506. Lifting mechanism; 507. Lifting cylinder; 508. Reciprocating block; 509. Riveting spring; 6. Detection mechanism; 601. Detection plate; 602. Detection cylinder; 603. Detection block; 604. First detection protrusion; 605. Second detection protrusion; 606. Detection needle; 607. Detection ring; 608. Detection spring; 7. Base plate feeding mechanism; 701. Feeding sliding module; 702. Feeding plate; 703. Connecting plate; 704. Feeding cylinder; 705. Pressing block; 8. Positioning mechanism; 801. Positioning plate; 802. Positioning cylinder; 803. Positioning post; 9. Hat-shaped block; 901. Bottom ring; 902. Connecting sleeve; 903. Circular cover plate; 904. Air inlet; 905. Guide slope. Detailed Implementation

[0030] Miniature rivet riveting refers to riveting miniature rivets onto a substrate, which has positioning holes and riveting holes. To address the shortcomings of existing technologies, this invention proposes a continuous miniature rivet riveting device, as described in the reference [reference missing]. Figure 1 , Figure 7 as well as Figure 8 The system includes a support plate 1 on which a first support frame 101 and a second support frame 102 are provided. A vibrating plate 103 is provided above the first support frame 101. The output end of the vibrating plate 103 is connected to a guide groove 104. A feeding plate 105 is provided above the second support frame 102. An mounting plate 106 is provided on the feeding plate 105. An adsorption sliding module 107 is provided on the mounting plate 106. An adsorption mechanism is provided on the slider of the adsorption sliding module 107. The adsorption mechanism can be moved above the adjustment mechanism 2 through the adsorption sliding module 107.

[0031] refer to Figure 2 The adsorption mechanism includes an adsorption plate 108 mounted on the slider of the adsorption sliding module 107. An adsorption cylinder 109 is mounted on the adsorption plate 108. An adsorption tube 110 is mounted on the transmission end of the adsorption cylinder 109. The adsorption tube 110 is connected to an external air pump. The adsorption end of the adsorption tube 110 points towards the feed plate 105. The vibrating plate 103 starts working first, moving the miniature round-headed rivets placed on it and feeding them into the guide groove 104 with their round heads facing upwards. The lower part of the round-headed rivet is located in the guide groove 104, and the top round head is located above the guide groove 104. By continuously feeding new rivets, the front rivets are pushed towards the adjustment mechanism 2. After the adsorption mechanism moves above the adjustment mechanism 2 via the adsorption sliding module 107, the adsorption cylinder 109 presses down the adsorption tube 110. At the same time, the external air pump starts working to adsorb the rivets and adsorb them at the bottom end of the adsorption tube 110.

[0032] refer to Figure 2 The guide groove 104 is connected to an adjustment mechanism 2 at its end. The adjustment mechanism 2 includes an adjustment cylinder 201 mounted on the first support frame 101. An adjustment block 202 is connected to the transmission end of the adjustment cylinder 201. The adjustment block 202 is slidably connected to the first support frame 101 via a slide rail mechanism 203. An adsorption hole 204 is provided above the adjustment block 202. The adjustment operation pushes the adjustment block 202 connected to its transmission end to reciprocate. Since the adjustment block 202 is slidably connected by a slide rail, its positional accuracy is high during movement. After the bottom of the rivet enters the adsorption hole 204, the adjustment block 202 moves it to one side, ensuring that the positional accuracy is high enough to cooperate with the adsorption mechanism to adsorb the rivet.

[0033] refer to Figure 11 The adsorption tube 110 is provided with a positioning mechanism 4 at its adsorption end. The positioning mechanism 4 includes a contour block 401 connected to the lower end of the adsorption tube 110. The contour block 401 is connected to the adsorption tube 110. Several rotating shafts 402 are provided on the inner wall of the contour block 401. Positioning torsion springs 403 are sleeved on the rotating shafts 402. A push plate 404 is connected to the positioning torsion springs 403. After the rivet enters the contour block 401, as the directional block is pressed down and the rivet is adsorbed, the rivet causes the push plate 404 to rotate. After rotation, the positioning torsion spring 403 resets and pushes the push plate 404 to reset, thereby applying a pushing force to the rivet from multiple directions, completing the fixing and positioning of the rivet, and locking the rivet in the contour groove to prevent the rivet from falling out.

[0034] refer to Figure 9The adsorption tube 110 is provided with a pushing mechanism 3, which includes a sliding sleeve 301 disposed on the inner wall of the adsorption tube 110. The sliding sleeve 301 is fixed inside the adsorption tube 110 by a connecting rod. A pushing block 302 is slidably connected inside the sliding sleeve 301. The device has a one-way hole 303 inside, a return spring 304 at the top of the one-way hole 303, and a cap-shaped block 9 at the other end of the return spring 304. The cap-shaped block 9 is slidably connected inside the one-way hole 303. A blocking block 305 is provided on the inner side of the bottom end of the pushing block 302. A connecting film 306 is provided at the bottom end of the sliding sleeve 301. The other end of the connecting film 306 is connected to the inner wall of the contour block 401. After the adsorption mechanism completes adsorption and moves to the position on the substrate, the external air pump connected to the adsorption tube 110 starts to exhaust gas, pushing the pushing block 302 downward and blowing the connecting film 306. After the connecting film 306 bulges, the rivets on it are pushed out of the contour groove.

[0035] refer to Figure 10 The cap-shaped block 9 includes a bottom ring 901 slidably connected to the cap-shaped block 9. A connecting sleeve 902 is provided below the bottom ring 901, and a circular cover plate 903 is provided below the connecting sleeve 902. An air inlet 904 is provided on the connecting sleeve 902, and a guide slope 905 is provided on the outer edge of the circular cover plate 903. The guide slope 905 can be pressed against the blocking block 305. When the external air pump performs adsorption, the external air pushes the cap-shaped block 9 upward due to air pressure, and the return spring 304 is compressed. Air flows in between the guide slope 905 and the blocking block 305, and is then drawn into an external air pump through the air inlet 904 to adsorb the rivet. After adsorption, the return spring 304 resets, pushing the cap-shaped block 9 to reset. The blocking block 305 and the guide slope 905 close. When the air pump blows air, the air pressure presses on the cap-shaped block 9, closing the blocking block 305 and the guide slope 905, preventing the gas from escaping. Then, during adsorption, the pushing block 302 is adsorbed and reset, allowing for the next adsorption and transport.

[0036] refer to Figure 3The feeding plate 105 is provided with a riveting mechanism 5. The riveting mechanism 5 includes a pushing cylinder 501 disposed above the feeding plate 105. The driving end of the pushing cylinder 501 is connected to a riveting plate 502. A riveting post 503 is connected to the riveting plate 502. A rivet groove 504 is provided at the bottom end of the riveting post 503. After the rivet is transported to the bottom of the riveting post 503 by the feeding mechanism, it is positioned by the positioning mechanism 8. After positioning, the rivet groove 504 at the bottom end of the riveting post 503 is above the rivet. Then the lifting mechanism 505 lifts the rivet to deform it and complete the riveting.

[0037] The second support frame 102 is provided with a lifting mechanism 505, which includes a lifting cylinder 506 mounted on the second support frame 102. The transmission end of the lifting cylinder 506 points towards the riveting post 503. A reciprocating block 507 is mounted above the lifting cylinder 506. A riveting post 508 is mounted on the upper end of the reciprocating block 507. At least one set of riveting springs 509 are mounted around the riveting post 508. The two ends of the riveting springs 509 are respectively connected to the feed plate. On 105 and the reciprocating block 507, the lifting cylinder 506 operates, pushing the reciprocating block 507 upward, which in turn pushes the riveting post 508 on it upward. At the same time, the riveting spring 509 is compressed and impacts the rivet, cooperating with the rivet groove 504 to deform the rivet, thereby fixing the rivet in place. After the riveting work of the rivet is completed, the lifting cylinder 506 resets, and then the riveting spring 509 rebounds, driving the reciprocating block 507 back to its original position.

[0038] refer to Figure 4 The feed plate 105 is provided with a detection mechanism 6, which includes a detection plate 601 on the feed plate 105, a detection cylinder 602 on the detection plate 601, a detection block 603 connected to the transmission end of the detection cylinder 602, a first detection protrusion 604 and a second detection protrusion 605 on the detection block 603, a detection needle 606 passing through the first detection protrusion and the second detection protrusion 605, and a detection circle on the outer edge of the detection needle 606. The detection needle 606 is fitted with a detection spring 608. The two ends of the detection spring 608 are respectively connected to the detection ring 607 and the first detection protrusion 604. After the riveted rivet moves to the detection mechanism 6, the detection cylinder 602 starts to press down, and then the detection needle 606 presses on the rivet, and then the detection spring 608 is compressed. At the same time, the tip of the detection needle 606 passes through the first detection protrusion 604. The distance of the needle passing through the first detection protrusion 604 is used to determine whether the riveting is qualified.

[0039] refer to Figure 6The feed plate 105 is provided with at least one set of positioning mechanisms 8. The positioning mechanism 8 includes a positioning plate 801 disposed above the feed plate 105. The positioning plate 801 is provided with a positioning cylinder 802. The transmission end of the positioning cylinder 802 is connected to a positioning post 803. The positioning post 803 points towards the feed plate 105. When the positioning cylinder 802 starts to work, it pushes the positioning cylinder 802 down, thereby moving the positioning post 803 into the positioning hole of the substrate to complete the positioning.

[0040] refer to Figure 5 The second support frame 102 is provided with a substrate feeding mechanism 7. The substrate feeding mechanism 7 includes a feeding sliding module 701 provided on the second support frame 102. A feeding plate 702 is connected to the slider of the feeding sliding module 701. A connecting plate 703 is provided on the feeding plate 702. A feeding cylinder 704 is provided on the connecting plate 703. The transmission end of the feeding cylinder 704 points to the feeding plate 702. A pressing block 705 is connected to the transmission end of the feeding cylinder 704. The feeding cylinder 704 starts working first. The pressing block 705 presses on the substrate, clamping the substrate between the pressing block 705 and the feeding plate 702. Then the feeding sliding module starts working, driving the feeding plate 702 on it to move, and at the same time dragging the clamped substrate to perform stepping motion to complete the feeding work of the substrate.

Claims

1. A continuous riveting device for miniature rivets, characterized in that, The system includes a support plate (1), on which a first support frame (101) and a second support frame (102) are mounted. A vibratory feeder (103) is mounted above the first support frame (101), and the output end of the vibratory feeder (103) is connected to a guide groove (104). An adjustment mechanism (2) is connected to the end of the guide groove (104). A feeding plate (105) is mounted above the second support frame (102), and a mounting plate (106) is mounted on the feeding plate (105). An adsorption sliding module (107) is mounted on the mounting plate (106), and an adsorption mechanism is mounted on the slider of the adsorption sliding module (107). The adsorption mechanism can be moved to the adjustment mechanism via the adsorption sliding module (107). Above the mechanism (2), the adsorption mechanism includes an adsorption plate (108) disposed on the slider of the adsorption sliding module (107), an adsorption cylinder (109) disposed on the adsorption plate (108), an adsorption tube (110) disposed at the transmission end of the adsorption cylinder (109), the adsorption end of the adsorption tube (110) pointing towards the feed plate (105), a pushing mechanism (3) disposed inside the adsorption tube (110), a positioning mechanism (4) disposed at the adsorption end of the adsorption tube (110), a riveting mechanism (5), a detection mechanism (6) and a substrate feeding mechanism (7) are sequentially disposed on the subsequent work station of the adsorption mechanism on the feed plate (105), and at least one set of positioning mechanisms (8) is disposed on the second support frame (102).

2. The micro rivet continuous riveting device according to claim 1, characterized in that, The adjustment mechanism (2) includes an adjustment cylinder (201) disposed on the first support frame (101). The transmission end of the adjustment cylinder (201) is connected to an adjustment block (202). The adjustment block (202) is slidably connected to the first support frame (101) through a slide rail mechanism (203). An adsorption hole (204) is provided above the adjustment block (202).

3. The micro rivet continuous riveting device according to claim 2, characterized in that, The alignment mechanism (4) includes a contour block (401) connected to the lower end of the adsorption tube (110). The contour block (401) is connected to the adsorption tube (110). A plurality of rotating shafts (402) are provided on the inner wall of the contour block (401). An alignment torsion spring (403) is sleeved on the rotating shaft (402). A push plate (404) is connected to the alignment torsion spring (403).

4. The micro rivet continuous riveting device according to claim 3, characterized in that, The pushing mechanism (3) includes a sliding sleeve (301) disposed on the inner wall of the adsorption tube (110). The sliding sleeve (301) is fixed in the adsorption tube (110) by a connecting rod (307). A pushing block (302) is slidably connected in the sliding sleeve (301). A one-way hole (303) is disposed in the pushing block (302). A reset spring (304) is disposed at the top of the one-way hole (303). A cap-shaped block (9) is disposed at the other end of the reset spring (304). The cap-shaped block (9) is slidably connected in the one-way hole (303). A blocking block (305) is disposed on the inner side of the bottom end of the pushing block (302). A connecting film (306) is disposed at the bottom end of the sliding sleeve (301). The other end of the connecting film (306) is connected to the inner wall of the contour block (401).

5. The micro rivet continuous riveting device according to claim 4, characterized in that, The cap-shaped block (9) includes a bottom ring (901) that is slidably connected to the one-way hole (303). A connecting sleeve (902) is provided below the bottom ring (901). A circular cover plate (903) is provided below the connecting sleeve (902). An air inlet (904) is provided on the connecting sleeve (902). A guide slope (905) is provided on the outer edge of the circular cover plate (903). The guide slope (905) can be pressed onto the blocking block (305).

6. The micro rivet continuous riveting device according to claim 1, characterized in that, The riveting mechanism (5) includes a push cylinder (501) disposed above the feed plate (105). The drive end of the push cylinder (501) is connected to a riveting plate (502). A riveting post (503) is connected to the riveting plate (502). A rivet groove (504) is provided at the lower end of the rivet post (503). A lifting mechanism (505) is provided below the rivet groove (504).

7. The micro rivet continuous riveting device according to claim 6, characterized in that, The lifting mechanism (505) includes a lifting cylinder (506) mounted on the second support frame (102). The transmission end of the lifting cylinder (506) points towards the riveting post (503). A reciprocating block (507) is mounted above the lifting cylinder (506). A riveting post (508) is mounted on the upper end of the reciprocating block (507). At least one set of riveting springs (509) is mounted around the riveting post (508). The two ends of the riveting springs (509) are respectively connected to the feed plate (105) and the reciprocating block (507).

8. The micro rivet continuous riveting device according to claim 1, characterized in that, The detection mechanism (6) includes a detection plate (601) disposed on the feed plate (105), a detection cylinder (602) disposed on the detection plate (601), a detection block (603) connected to the transmission end of the detection cylinder (602), a first detection protrusion (604) and a second detection protrusion (605) disposed on the detection block (603), a detection needle (606) passing through the first detection protrusion (604) and the second detection protrusion (605), a detection ring (607) disposed on the outer edge of the detection needle (606), a detection spring (608) sleeved on the detection needle (606), and the two ends of the detection spring (608) being respectively connected to the detection ring (607) and the first detection protrusion (604).

9. The micro rivet continuous riveting device according to claim 1, characterized in that, The positioning mechanism (8) includes a positioning plate (801) disposed above the feed plate (105), a positioning cylinder (802) disposed on the positioning plate (801), a positioning column (803) connected to the transmission end of the positioning cylinder (802), and the positioning column (803) pointing towards the feed plate (105).

10. The micro rivet continuous riveting device according to claim 1, characterized in that, The substrate feeding mechanism (7) includes a feeding sliding module (701) disposed on the second support frame (102). A feeding plate (702) is connected to the slider of the feeding sliding module (701). A connecting plate (703) is disposed on the feeding plate (702). A feeding cylinder (704) is disposed on the connecting plate (703). The transmission end of the feeding cylinder (704) points to the feeding plate (702). A pressing block (705) is connected to the transmission end of the feeding cylinder (704).

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