Heat sealing device for plastic packaging bag production

Abstract

The utility model relates to the technical field of plastic packaging bag production, and discloses a heat sealing device for plastic packaging bag production, which comprises a cooling mechanism, a driving mechanism and a limiting mechanism. The heat sealing module is pushed downwards through a piston rod, the heat sealing module drives a connecting rod, the connecting rod drives a rubber limiting block, the rubber limiting block drives a cooling plate and a T-shaped sliding block to move downwards along a T-shaped sliding groove, meanwhile, the rubber limiting block drives a cooling shell, the cooling shell drives a driving motor, and the driving motor drives a motor rotating rod; a motor rotating rod drives fan blades, a cooling shell drives a rotating rod, and the rotating rod drives fan blades II, so that the output end of a driving motor rotates the motor rotating rod, the motor rotating rod rotates the fan blades, the motor rotating rod is engaged with a rack, the rack is engaged with the rotating rod, and the rotating rod rotates the fan blades II; and the plastic packaging bag subjected to heat sealing is limited through the rubber limiting block, and then the plastic packaging bag subjected to heat sealing is cooled through the fan blade and the second fan blade.

Description

TECHNICAL FIELD

[0001] The utility model relates to plastic packaging bag production technical field especially relates to a plastic packaging bag production is with heat sealing device. BACKGROUND

[0002] The production process of plastic packaging bags usually involves heat sealing process, and the heat sealing device is one of the key equipment in this process. The heat sealing device is used to fuse two or more layers of plastic film material together by heating and pressing, thereby completing the sealing, jointing and other parts of the bag.

[0003] Plastic packaging bags need to be heat sealed during production. The heat sealer generates a certain temperature to seal the plastic packaging bags. Since the plastic packaging bag is thin, the sealing part will be soft and deformed after heat sealing. If the sealing part cannot be cooled quickly and effectively after heat sealing, the plastic packaging bag may be deformed or even damaged, which will seriously affect the production quality of the plastic packaging bag. SUMMARY

[0004] To solve the above technical problems, the utility model provides a plastic packaging bag production heat sealing device.

[0005] The utility model discloses the following technical scheme is realized: a plastic packaging bag production heat sealing device, including cooling mechanism, drive mechanism and limiting mechanism, drive mechanism is located in the inside of cooling mechanism, limiting mechanism is located in the outside of cooling mechanism.

[0006] The cooling mechanism includes a support plate, the top of the support plate is fixedly connected with a heat sealing device, the inner wall of the heat sealing device is slidably connected with a piston rod, the bottom of the piston rod is fixedly connected with a heat sealing module, the top of the support plate is fixedly connected with a support plate two, a T-shaped sliding groove is formed in the surface of the support plate two, a T-shaped sliding block is slidably connected with the inner wall of the T-shaped sliding groove, a rubber limiting block is fixedly connected with the end of the T-shaped sliding block away from the T-shaped sliding groove, a cooling plate is fixedly connected with the end of the T-shaped sliding block away from the T-shaped sliding groove, the outer wall of the cooling plate is fixedly connected with the inner wall of the rubber limiting block, a cooling shell is fixedly connected with the top of the inner wall of the cooling shell, a drive motor is fixedly connected with the output end of the drive motor, a motor rotating rod is fixedly connected with the surface of the end of the motor rotating rod away from the drive motor, a fan blade is fixedly connected with the surface of the motor rotating rod, a rack is meshed with the surface of the motor rotating rod, a rotating rod is meshed with the end of the rack away from the motor rotating rod, the top of the rotating rod is rotatably connected with the top of the inner wall of the cooling shell, a fan blade two is fixedly connected with the surface of the rotating rod, a connecting rod is fixedly connected with the end of the rubber limiting block close to the heat sealing device, and the connecting rod is fixedly connected with the surface of the heat sealing module away from the rubber limiting block.

[0007] As a further improvement of the above scheme, the piston rod is provided with four, four said piston rod with heat sealing device center symmetry setting, the T-shaped sliding groove is provided with four, four said T-shaped sliding groove with cooling shell center symmetry setting, the connecting rod is provided with two, two said connecting rod with cooling shell center symmetry setting.

[0008] Through the above technical scheme, the heat sealing module drives the connecting rod, the connecting rod drives the rubber limiting block, the rubber limiting block drives the cooling plate and the T-shaped sliding block to move downward along the T-shaped sliding groove, and at the same time, the rubber limiting block drives the cooling shell, the cooling shell drives the driving motor, the driving motor drives the motor rotating rod, the motor rotating rod drives the fan blade, and at the same time, the cooling shell drives the rotating rod, the rotating rod drives the second fan blade.

[0009] As a further improvement of the above scheme, the driving mechanism includes a motor support seat, the top of the motor support seat is fixedly connected with a motor, the output end of the motor is fixedly connected with a motor rotating rod two, the surface of the motor rotating rod two is engagedly connected with a rack two, the end of the motor rotating rod two away from the motor is fixedly connected with a rotating shaft, and the outer wall of the rotating shaft is rotatably connected with the inner wall of the support plate.

[0010] As a further improvement of the above scheme, the surface of the rotating shaft is provided with a limiting groove, the inner wall of the limiting groove is in contact with a collecting winding rod, the surface of the support plate is provided with a placing groove, the end of the collecting winding rod away from the limiting groove is rotatably connected with the surface of the placing groove, the end of the motor rotating rod two away from the motor rotating rod two is engagedly connected with a limiting gear, the back surface of the limiting gear is fixedly connected with a transmission rod, the outer wall of the transmission rod is rotatably connected with the inner wall of the support plate, the surface of the transmission rod is drivingly connected with a conveyor belt, the surface of the limiting gear is engagedly connected with a rack three, and the inner wall of the end of the conveyor belt away from the transmission rod is drivingly connected with a transmission rod two.

[0011] As a further improvement of the above scheme, the end of the rack three away from the limiting gear is engagedly connected with a limiting gear three, the back surface of the limiting gear three is fixedly connected with the front surface of the transmission rod two, the surface of the limiting gear two is engagedly connected with a rack four, the end of the rack four away from the limiting gear two is engagedly connected with a limiting gear three, and the back surface of the limiting gear three is fixedly connected with a transmission rod three.

[0012] By the above technical scheme, the motor is operated, the motor output end rotates the motor rotating rod two, the motor rotating rod two rotates the rotating shaft, the rotating shaft rotates the collecting rod, the raw materials and the waste materials after production are transported and collected, at the same time, the collecting rod pulls the raw materials on the raw material roller one to move to the hot sealing device through the guide rod, at the same time, the collecting rod pulls the raw materials on the raw material roller two to move to the hot sealing device, at the same time, the motor rotating rod two rotates the rack two, and the rack two rotates the limit gear.

[0013] As a further improvement of the above scheme, the hot sealing limiting block is provided with four, the four hot sealing limiting blocks are symmetrically arranged with the hot sealing module as the center, and the slider is provided with four, the four sliders are symmetrically arranged with the hot sealing module as the center.

[0014] By the above technical scheme, when the hot sealing module moves downward, the hot sealing limiting block is driven by the hot sealing module, the slider inside the sliding groove is driven by the hot sealing limiting block to move downward, when the rubber limiting head at the bottom of the slider contacts the plastic of the raw material roller two and the raw material roller one, the rubber limiting head generates downward thrust and upward reaction force under the condition of the spring.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] The utility model discloses a hot sealing device for plastic packaging bag, which comprises a hot sealing module, a piston rod, a connecting rod, a rubber limiting block, a cooling plate, a T-shaped sliding groove, a T-shaped slider, a cooling shell, a driving motor, a motor rotating rod, a fan blade, a rotating rod, a fan blade two, a rack two, a limit gear and a raw material roller.

[0017] The utility model discloses a hot sealing device for plastic packaging bag, which comprises a hot sealing module, a piston rod, a connecting rod, a rubber limiting block, a cooling plate, a T-shaped sliding groove, a T-shaped slider, a cooling shell, a driving motor, a motor rotating rod, a fan blade, a rotating rod, a fan blade two, a rack two, a limit gear and a raw material roller. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole structure schematic view of the utility model;

[0019] Figure 2 It is the cooling mechanism structure schematic view of the utility model;

[0020] Figure 3 It is the cooling shell section structure schematic view of the utility model;

[0021] Figure 4 It is the cooling plate structure schematic view of the utility model;

[0022] Figure 5 It is the driving mechanism structure schematic view of the utility model;

[0023] Figure 6 It is the driving mechanism section structure schematic view of the utility model;

[0024] Figure 7 It is the utility model Figure 6 A portion enlarged structure schematic view in the middle of the utility model;

[0025] Figure 8 It is the rack four structure schematic view of the utility model;

[0026] Figure 9 It is the limiting mechanism structure schematic view of the utility model;

[0027] Figure 10 It is the utility model Figure 9 B portion enlarged structure schematic view in the middle of the utility model.

[0028] Main symbol explanation:

[0029] 1, cooling mechanism, 101, support plate, 102, heat sealing device, 103, piston rod, 104, heat sealing module, 105, support plate two, 106, T-shaped chute, 107, T-shaped slider, 108, rubber limiting block, 109, cooling plate, 110, cooling shell, 111, drive motor, 112, motor rotating rod, 113, fan blade, 114, rack, 115, rotating rod, 116, fan blade two, 117, connecting rod, 2, drive mechanism, 201, motor support seat, 202, motor, 203, motor rotating rod two, 204, rack two, 205, rotating shaft, 206, limiting groove, 207, collection winding rod, 208, placing groove, 209, limiting gear, 210, transmission rod, 211, conveying belt, 212, rack three, 213, limiting gear two, 214, transmission rod two, 215, limiting gear three, 216, transmission rod three, 217, transmission rod four, 218, raw material roller one, 219, raw material roller two, 220, guide rod, 221, rack four, 222, conveying belt two, 3, limiting mechanism, 301, heat sealing limiting block, 302, chute, 303, slider, 304, rubber limiting head, 305, spring. DETAILED DESCRIPTION

[0030] In the following, the utility model will be further described in combination with the drawings and specific embodiments, it is explained that, under the premise of not conflicting, the following description of each embodiment or each technical feature between can be combined to form new embodiments.

[0031] Embodiments:

[0032] Please combine Figures 1-10 The heat sealing device for plastic packaging bag production of the embodiment comprises a cooling mechanism 1, a drive mechanism 2 and a limiting mechanism 3, the drive mechanism 2 is located in the inside of the cooling mechanism 1, and the limiting mechanism 3 is located outside the cooling mechanism 1.

[0033] The cooling mechanism 1 comprises a support plate 101, the top of the support plate 101 is fixedly connected with a heat sealing device 102, the inner wall of the heat sealing device 102 is slidably connected with a piston rod 103, the bottom of the piston rod 103 is fixedly connected with a heat sealing module 104, the top of the support plate 101 is fixedly connected with a support plate two 105, a T-shaped sliding groove 106 is formed in the surface of the support plate two 105, a T-shaped sliding block 107 is slidably connected with the inner wall of the T-shaped sliding groove 106, a rubber limiting block 108 is fixedly connected with the end, away from the T-shaped sliding groove 106, of the T-shaped sliding block 107, a cooling plate 109 is fixedly connected with the end, away from the T-shaped sliding groove 106, of the T-shaped sliding block 107, the outer wall of the cooling plate 109 is fixedly connected with the inner wall of the rubber limiting block 108, the top of the rubber limiting block 108 is fixedly connected with a cooling shell 110, the inner wall top of the cooling shell 110 is fixedly connected with a driving motor 111, the output end of the driving motor 111 is fixedly connected with a motor rotating rod 112, the surface of the end, away from the driving motor 111, of the motor rotating rod 112 is fixedly connected with a fan blade 113, the surface of the motor rotating rod 112 is meshedly connected with a rack 114, the end, away from the motor rotating rod 112, of the rack 114 is meshedly connected with a rotating rod 115, the top of the rotating rod 115 is rotatably connected with the inner wall top of the cooling shell 110, the surface of the rotating rod 115 is fixedly connected with a fan blade two 116, the end, close to the heat sealing device 102, of the rubber limiting block 108 is fixedly connected with a connecting rod 117, and the end, away from the rubber limiting block 108, of the connecting rod 117 is fixedly connected with the surface of the heat sealing module 104.

[0034] The piston rod 103 is provided with four, the four piston rods 103 are centrally symmetrically arranged with the heat sealing device 102, the T-shaped sliding groove 106 is provided with four, the four T-shaped sliding grooves 106 are centrally symmetrically arranged with the cooling shell 110, the connecting rod 117 is provided with two, and the two connecting rods 117 are centrally symmetrically arranged with the cooling shell 110.

[0035] The driving mechanism 2 comprises a motor support seat 201, the top of the motor support seat 201 is fixedly connected with a motor 202, the output end of the motor 202 is fixedly connected with a motor rotating rod two 203, the surface of the motor rotating rod two 203 is meshedly connected with a rack two 204, the end, away from the motor 202, of the motor rotating rod two 203 is fixedly connected with a rotating shaft 205, and the outer wall of the rotating shaft 205 is rotatably connected with the inner wall of the support plate 101.

[0036] The surface of the rotating shaft 205 is provided with a limiting groove 206, and the inner wall of the limiting groove 206 is in contact with a collection winding rod 207. The surface of the supporting plate 101 is provided with a placing groove 208, and one end of the collection winding rod 207 away from the limiting groove 206 is rotatably connected to the surface of the placing groove 208. The end of the motor rotating rod two 203 away from the motor rotating rod two 203 is meshedly connected with a limiting gear 209. The back surface of the limiting gear 209 is fixedly connected with a transmission rod 210. The outer wall of the transmission rod 210 is rotatably connected with the inner wall of the supporting plate 101. The surface of the transmission rod 210 is drivingly connected with a conveying belt 211. The surface of the limiting gear 209 is meshedly connected with a rack three 212. The inner wall of one end of the conveying belt 211 away from the transmission rod 210 is drivingly connected with a transmission rod two 214. The outer wall of the transmission rod two 214 is rotatably connected with the inner wall of the supporting plate 101.

[0037] The end of the rack three 212 away from the limiting gear 209 is meshedly connected with a limiting gear three 215. The back surface of the limiting gear three 215 is fixedly connected to the front surface of the transmission rod two 214. The surface of the limiting gear two 213 is meshedly connected with a rack four 221. The end of the rack four 221 away from the limiting gear two 213 is meshedly connected with the limiting gear three 215. The back surface of the limiting gear three 215 is fixedly connected with a transmission rod three 216. The surface of the transmission rod three 216 is drivingly connected with a conveying belt two 222. The inner wall of one end of the conveying belt two 222 away from the transmission rod three 216 is drivingly connected with a transmission rod four 217. The outer wall of the transmission rod three 216 is rotatably connected with the inner wall of the supporting plate 101. The outer wall of the transmission rod four 217 is rotatably connected with the inner wall of the supporting plate 101. The right top of the supporting plate 101 is rotatably connected with a raw material roller one 218. The right top of the supporting plate 101 is rotatably connected with a raw material roller two 219. The right top of the supporting plate 101 is fixedly connected with a guide rod 220.

[0038] The limiting mechanism 3 comprises a heat sealing limiting block 301, the surface of which is fixedly connected to the surface of the heat sealing module 104. The bottom of the heat sealing limiting block 301 is provided with a sliding groove 302. The inner wall of the sliding groove 302 is slidingly connected with a sliding block 303. The bottom of the sliding block 303 is fixedly connected with a rubber limiting head 304. The top of the sliding block 303 is fixedly connected with a spring 305. The top of the spring 305 is fixedly connected to the top of the inner wall of the sliding groove 302.

[0039] The heat sealing limiting block 301 is provided with four heat sealing limiting blocks 301, which are symmetrically arranged around the heat sealing module 104. The sliding block 303 is provided with four sliding blocks 303, which are symmetrically arranged around the heat sealing module 104.

[0040] The implementation principle of the heat sealing device for plastic packaging bag production in the embodiment of the application is as follows: the motor 202 is operated, the motor 202 outputs end rotates the motor rotating rod two 203, the motor rotating rod two 203 rotates the rotating shaft 205, the rotating shaft 205 rotates the collection winding rod 207, the raw materials and the waste materials after production are transported and collected, at the same time, the collection winding rod 207 pulls the raw materials on the raw material roller one 218 to move to the heat sealing device 102 through the guide rod 220, at the same time, the collection winding rod 207 pulls the raw materials on the raw material roller two 219 to move to the heat sealing device 102, at the same time, the motor rotating rod two 203 rotates the rack two 204, the rack two 204 rotates the limit gear 209, the limit gear 209 rotates the transmission rod 210, the transmission rod 210 rotates the conveying belt 211, the conveying belt 211 rotates the transmission rod two 214, at the same time, the transmission rod two 214 rotates the rack four 221, the conveying belt 211 rotates the limit gear three 215, the limit gear three 215 rotates the transmission rod three 216, the transmission rod three 216 rotates the conveying belt two 222, the conveying belt two 222 rotates the transmission rod four 217, so that the raw materials and the finished products are transported to the collection winding rod 207 along the bottom of the heat sealing device 102 and the rubber limiting block 108, when the heat sealing device 102 seals the plastic packaging bag, the heat sealing device 102 moves the piston rod 103 downward, the piston rod 103 pushes the heat sealing module 104 downward, the heat sealing module 104 drives the connecting rod 117, the connecting rod 117 drives the rubber limiting block 108, the rubber limiting block 108 drives the cooling plate 109 and the T-shaped sliding block 107 to move downward along the T-shaped sliding groove 106, at the same time, the rubber limiting block 108 drives the cooling shell 110, the cooling shell 110 drives the driving motor 111, the driving motor 111 drives the motor rotating rod 112, the motor rotating rod 112 drives the fan blade 113, at the same time, the cooling shell 110 drives the rotating rod 115, the rotating rod 115 drives the fan blade two 116, so that the driving motor 111 outputs end rotates the motor rotating rod 112, the motor rotating rod 112 rotates the fan blade 113, at the same time, the motor rotating rod 112 engages the rack 114, the rack 114 engages the rotating rod 115, the rotating rod 115 rotates the fan blade two 116, so that the rubber limiting block 108 limits the plastic packaging bag after heat sealing, and then the fan blade 113 and the fan blade two 116 cool the plastic packaging bag after heat sealing, thereby solving the problem of fast and effective cooling of the sealing part of the plastic packaging bag after heat sealing treatment, improving the production quality after heat sealing and the work efficiency of subsequent work, when the heat sealing module 104 moves downward, the heat sealing module 104 drives the heat sealing limiting block 301, the heat sealing limiting block 301 drives the sliding block 303 inside the sliding groove 302 to move downward, when the rubber limiting head 304 at the bottom of the sliding block 303 contacts the plastic of the raw material roller two 219 and the raw material roller one 218, the rubber limiting head 304 generates downward thrust and upward reaction force under the action of the spring 305, thereby limiting the plastic packaging bag to be sealed,Prevent the plastic packaging bag from deviating during heat sealing in the heat sealing module 104, and affect the production quality.

[0041] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A heat sealing device for plastic packaging bag production, characterized in that, Including cooling mechanism (1), drive mechanism (2) and limiting mechanism (3), drive mechanism (2) is located inside cooling mechanism (1), limiting mechanism (3) is located outside cooling mechanism (1); The cooling mechanism (1) includes a support plate (101), the top of the support plate (101) is fixedly connected with a heat sealing device (102), the inner wall of the heat sealing device (102) is slidably connected with a piston rod (103), the bottom of the piston rod (103) is fixedly connected with a heat sealing module (104), the top of the support plate (101) is fixedly connected with a support plate two (105), a T-shaped sliding groove (106) is formed in the surface of the support plate two (105), a T-shaped sliding block (107) is slidably connected with the inner wall of the T-shaped sliding groove (106), a rubber limiting block (108) is fixedly connected with the end of the T-shaped sliding block (107) away from the T-shaped sliding groove (106), a cooling plate (109) is fixedly connected with the end of the T-shaped sliding block (107) away from the T-shaped sliding groove (106), the outer wall of the cooling plate (109) is fixedly connected with the inner wall of the rubber limiting block (108), a cooling shell (110) is fixedly connected with the top of the rubber limiting block (108), a drive motor (111) is fixedly connected with the inner wall top of the cooling shell (110), a motor rotating rod (112) is fixedly connected with the output end of the drive motor (111), a fan blade (113) is fixedly connected with the surface of the end of the motor rotating rod (112) away from the drive motor (111), a rack (114) is meshedly connected with the surface of the motor rotating rod (112), a rotating rod (115) is meshedly connected with the end of the rack (114) away from the motor rotating rod (112), the rotating rod (115) is rotatably connected with the inner wall top of the cooling shell (110), a fan blade two (116) is fixedly connected with the surface of the rotating rod (115), a connecting rod (117) is fixedly connected with the end of the rubber limiting block (108) close to the heat sealing device (102), the connecting rod (117) is fixedly connected with the surface of the heat sealing module (104) away from the rubber limiting block (108).

2. The heat sealing device for plastic packaging bag production according to claim 1, characterized in that: The piston rod (103) is provided with four, the four piston rods (103) are symmetrically arranged with the center of the heat sealing device (102), the T-shaped sliding groove (106) is provided with four, the four T-shaped sliding grooves (106) are symmetrically arranged with the center of the cooling shell (110), the connecting rod (117) is provided with two, the two connecting rods (117) are symmetrically arranged with the center of the cooling shell (110).

3. The heat sealing device for plastic packaging bag production according to claim 1, characterized in that: The driving mechanism (2) includes motor support seat (201), the top of motor support seat (201) is fixedly connected with motor (202), the output end of motor (202) is fixedly connected with motor rotating rod two (203), motor rotating rod two (203) surface meshing is connected with rack two (204), the end of motor rotating rod two (203) away from motor (202) is fixedly connected with rotating shaft (205), the outer wall of rotating shaft (205) is rotatably connected in the inner wall of support plate (101).

4. The heat sealing device for plastic packaging bag production according to claim 3, characterized in that: The surface of rotating shaft (205) is provided with a limiting groove (206), the inner wall of limiting groove (206) is in contact with a collection winding rod (207), the surface of support plate (101) is provided with a placing groove (208), one end of collection winding rod (207) away from limiting groove (206) is rotatably connected on the surface of placing groove (208), the end of motor rotating rod two (203) away from motor rotating rod two (203) is meshed with a limiting gear (209), the back of limiting gear (209) is fixedly connected with a transmission rod (210), the outer wall of transmission rod (210) is rotatably connected in the inner wall of support plate (101), the surface of transmission rod (210) is drivingly connected with a conveyor belt (211), the surface of limiting gear (209) is meshed with a rack three (212), the inner wall of one end of conveyor belt (211) away from transmission rod (210) is drivingly connected with a transmission rod two (214), the outer wall of transmission rod two (214) is rotatably connected in the inner wall of support plate (101).

5. The heat sealing device for plastic packaging bag production according to claim 4, characterized in that: The end of rack three (212) away from limiting gear (209) is meshed with a limiting gear three (215), the back of limiting gear three (215) is fixedly connected to the front of transmission rod two (214), the surface of limiting gear two (213) is meshed with a rack four (221), the end of rack four (221) away from limiting gear two (213) is meshed with a limiting gear three (215), the back of limiting gear three (215) is fixedly connected with a transmission rod three (216), the surface of transmission rod three (216) is drivingly connected with a conveyor belt two (222), the inner wall of one end of conveyor belt two (222) away from transmission rod three (216) is drivingly connected with a transmission rod four (217), the outer wall of transmission rod three (216) is rotatably connected in the inner wall of support plate (101), the outer wall of transmission rod four (217) is rotatably connected in the inner wall of support plate (101), the right top of support plate (101) is rotatably connected with raw material roller one (218), the right top of support plate (101) is rotatably connected with raw material roller two (219), the right top of support plate (101) is fixedly connected with a guide rod (220).

6. The heat sealing device for plastic packaging bag production according to claim 1, characterized in that: The limiting mechanism (3) includes a heat sealing limiting block (301), the surface of which is fixedly connected to the surface of the heat sealing module (104), a sliding groove (302) is opened in the bottom of the heat sealing limiting block (301), a sliding block (303) is slidably connected to the inner wall of the sliding groove (302), a rubber limiting head (304) is fixedly connected to the bottom of the sliding block (303), a spring (305) is fixedly connected to the top of the sliding block (303), and the top of the spring (305) is fixedly connected to the top of the inner wall of the sliding groove (302).

7. The heat sealing device for plastic packaging bag production according to claim 6, characterized in that: The heat sealing limiting block (301) is provided with four heat sealing limiting blocks (301), which are symmetrically arranged around the heat sealing module (104), and the sliding block (303) is provided with four sliding blocks (303), which are symmetrically arranged around the heat sealing module (104).

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