Thermal forming mold for lunch box production
By designing a thermoforming mold containing a walking mechanism, the traditional mold system has solved the shortcomings in control accuracy and energy utilization, and efficient and accurate plastic sheet movement and automatic mold timing coordination are achieved, reducing production and maintenance costs.
Patent Information
- Application Number
- CN202510529104.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2025-05-30
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When the lateral movement of the plastic sheet and the vertical movement of the mold, the traditional thermoforming mold system is susceptible to control accuracy, resulting in misalignment of movement, increasing the probability of failure and difficulty of debugging. The multi-power mechanism operates for a long time at high load, resulting in energy waste and high maintenance costs.
A thermoforming mold including supporting, upper formwork, lower formwork, cylinder, walking mechanism and other components is designed. The walking mechanism realizes synchronous movement of plastic sheets and automatic timing coordination of molds through components such as rotating shafts, conveying wheels, sprockets, and power racks, ensuring high energy utilization and simple and reliable structure.
Through the automatic timing coordination of the mold and the walking mechanism, the possibility of finished product defects is reduced, maintenance and production costs are reduced, and the accuracy of plastic sheet conveying and the molding accuracy of lunch boxes is improved.
Smart Images
Figure CN120056427A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of lunch box production, and in particular relates to a thermoforming mould for lunch box production. Background Art
[0002] In the manufacturing field of plastic products such as disposable lunch boxes, thermoforming molds are key equipment for achieving efficient and precise production. However, traditional thermoforming mold systems usually consist of multiple independent power mechanisms that work together to achieve mold closing / opening actions and lateral conveying of plastic sheets. However, such designs have the following technical defects: 1. The lateral movement of the plastic sheet and the vertical movement of the mold need to be strictly coordinated in time, but the independent drive system is easily affected by the control accuracy and prone to movement dislocation.
[0003] 2. Increased failure probability and debugging difficulty. For example, in the lunch box production cycle, mold opening and closing, plastic feeding and other actions need to be triggered by different control systems, which can easily lead to finished product defects due to signal delays or parameter mismatches.
[0004] 3. Long-term high-load operation of multiple power mechanisms causes energy waste and increases the complexity of the mechanical structure and maintenance costs.
[0005] 4. It restricts the further improvement of production efficiency and energy utilization. Summary of the invention
[0006] The purpose of the present invention is to provide a thermoforming mold for lunch box production, so as to solve the problems mentioned in the background technology.
[0007] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows: A thermoforming mold for lunch box production, comprising a support, an upper mold plate and a lower mold plate are installed on the upper side of the support, a cylinder fixed to the support is vertically installed on the upper side of the upper mold plate of the support, the output end of the cylinder is drivingly connected to the upper mold plate, and a walking mechanism is symmetrically installed on the front and rear sides of the support; The walking mechanism includes rotating shafts that are spaced apart on the left and right and are rotatably connected to the support, and each of the rotating shafts is drivingly connected to a transmission wheel at the rear side, and a plurality of sprocket groups are installed on the front side of the support, and the sprocket groups are arranged on the left and right and staggered front and back, and the sprocket groups adjacent to the left and right are connected end to end in a driving manner, and the plurality of rotating shafts are respectively connected in a driving manner to the corresponding sprocket groups, and a plurality of pressing wheels that match the transmission wheels are rotatably installed on the upper side; A disc rotatably connected to the support is installed on the front side of the sprocket set. The disc is in transmission connection with one of the rotating shafts. A circular cavity is formed inside the disc. A ratchet is rotatably installed inside the circular cavity. A pawl hinged to the circular cavity is installed on the side of the ratchet. A spring piece is installed on the side of the pawl. Two ends of the spring piece are respectively fixedly connected to the middle of the pawl and the side of the circular cavity. A spur gear in transmission connection with the ratchet is rotatably installed on the front side of the disc. A power rack meshing with the spur gear is vertically installed on the side of the spur gear. The power rack is in transmission connection with the upper template.
[0008] A slide bar slidably connected to the power rack vertically is installed in the middle of the power rack. An abutting block abutting against the power rack is fixed to the bottom of the slide bar. A control rod fixed to the upper template is installed on the upper side of the slide bar. A support spring is sleeved outside the slide bar. Two ends of the support spring are respectively fixedly connected to the control rod and the power rack. A limit block is fixed to the left side of the power rack. A limit rod matching the limit block is fixed to the upper side of the support.
[0009] Elastic telescopic rods are symmetrically installed on the left and right sides of each disc. The elastic telescopic rods are fixedly connected to the support. Friction blocks matching the discs are installed on the left and right sides of the discs. Each friction block is in transmission connection with the output end of the elastic telescopic rod at the corresponding position.
[0010] A plurality of limit columns are vertically fixed to the upper side of the upper template and the lower side of the lower template. The limit columns are sleeved with sliding sleeves slidably connected to them. The sliding sleeves on the upper and lower sides are fixedly connected to the support. A synchronization component for controlling its position is installed on the side of the lower template.
[0011] The number of the synchronization components is two groups and they are symmetrically installed on the front and back sides of the support. The synchronization component includes a synchronization gear rotatably connected to the support. An upper rack and a lower rack are symmetrically installed on the side of the synchronization gear in a circumferential manner. The upper side of the upper rack is fixedly connected to the upper template. The lower side of the lower rack is fixedly connected to the lower template.
[0012] A plurality of limiting grooves are provided on the middle sides close to each other of the upper template and the lower template. A sliding groove penetrating up and down is provided in the middle of each limiting groove. A sliding rod is slidably installed up and down inside the sliding groove. A top block matching the limiting groove is fixed to the lower end of the upper sliding rod and the upper end of the lower sliding rod. A frustum is fixed to the top end of the upper sliding rod and the bottom end of the lower sliding rod. Support plates are fixed to the upper side of the upper template and the lower side of the lower template. A return spring is sleeved outside the sliding rod, and the upper and lower ends of the return spring are respectively in transmission connection with the support plate and the frustum. An air cylinder is installed on the lower side of the lower template. A piston matching the air cylinder is assembled inside the air cylinder. The piston is in transmission connection with the lower template. An exhaust pipe is installed at the bottom of the air cylinder and is connected to the air cylinder through a pipeline. An air inlet pipe is installed on the upper side of the exhaust pipe. A one-way valve is installed in the middle of the air inlet pipe. Air blowing holes penetrating through the upper template and the lower template respectively are provided on the side surfaces of the sliding rods, and a plurality of the air blowing holes are all connected to the exhaust pipe through pipelines.
[0013] A plurality of vertically arranged rods spaced left and right are installed on the front and rear sides of the support. A horizontally oriented cross plate is slidably connected to the upper sides of the vertically arranged rods. The front and rear pressing wheels are respectively rotatably connected to the front and rear cross plates. A pressing spring is sleeved outside the vertically arranged rods, and the upper and lower ends of the pressing spring are respectively fixedly connected to the top of the vertically arranged rod and the upper side of the cross plate.
[0014] Limiting hooks are fixed to the lower side of the upper rack and the upper side of the lower rack. The lower limiting hook abuts against the right side of the lower rack, and the upper limiting hook abuts against the left side of the upper rack.
[0015] A drive shaft penetrating through the front and rear is rotatably installed on the left side of the support. The two leftmost front and rear conveyor wheels are both in transmission connection with the drive shaft. Cranks are fixedly installed concentrically with the drive shaft at the front and rear.
[0016] A plurality of air permeation holes penetrating up and down are evenly provided inside the lower template.
[0017] The cooperation of the ratchet, pawl, spring piece, spur gear and power rack enables the walking mechanism to synchronously control the movement of the plastic sheet when the upper template and the lower template are opened, and the intermittent transmission of the plastic sheet stops moving during the thermoplastic operation of the mold. Such a setting makes full use of the energy of the cylinder, and at the same time realizes the automatic timing cooperation between the mold and the walking mechanism, reduces the possibility of finished product defects in the product, and at the same time makes the overall structure of the mold simple and reliable, reducing the maintenance cost and the production cost of the lunch box; the cooperation of the sliding power rack, support spring, abutting block, limit block and limit rod enables the conveying wheel to drive the plastic sheet to move only after the upper template and the lower template are separated by a certain distance, so as to prevent the plastic sheet from starting to move when the mold is not completely separated from the lunch box, thereby protecting the processed lunch box and improving the stability during the lunch box production process; the elastic telescopic rod makes the friction block always abut against the disc, so that while not affecting the power rack to drive the conveying wheel to work, it can also prevent the conveying wheel from accidentally rotating due to external force, thereby improving the conveying accuracy of the conveying wheel for the plastic sheet; the cooperation of the limit rod and the sliding sleeve is used to limit the lateral position of the upper template and the lower template, so that the upper template and the lower template are more accurately closed, thereby enhancing product consistency, ensuring the production quality of the lunch box, and improving the reliability of the mold; the symmetrically arranged synchronous components on the front and rear enable the upper template and the lower template to run synchronously and in opposite directions through the cooperation of the upper rack, lower rack and synchronous gear. This movement mode reduces the up and down displacement of the plastic sheet during the forming process, thereby improving the forming accuracy of the lunch box. At the same time, the cylinder drive combined with the synchronous gear rack mechanism ensures that the upper / lower templates move synchronously and quickly, shortening the forming cycle; the piston linked to the lower template enables the lower template to compress air through the air cylinder when moving downward and blow air into the lunch box through the exhaust pipe, so that the thermoplastic lunch box can be automatically demolded when the upper template and the lower template are opened outward, ensuring the continuous operation of the mold, reducing the dependence on manual labor, and at the same time reducing the risk of damage to the lunch box during demolding; the cooperation of the cross plate and the pressing spring enables the pressing wheel to always obtain a downward pressure, thereby increasing the friction between the plastic sheet and the conveying wheel, preventing relative displacement between them during movement, and further improving the movement accuracy of the plastic sheet during the mold operation. At the same time, the clamping force of the pressing wheel on the material can be automatically adjusted to adapt to the production of lunch boxes with different thicknesses or materials; the upper and lower distributed limit hooks can assist in stabilizing the upper rack and the lower rack, further improving the operation stability and reliability of the synchronous components; the setting of the transmission shaft and the cranks on both the front and rear sides enables the user to only rotate the crank to control the conveying wheel to drive the plastic sheet when installing the plastic sheet, thereby facilitating the installation of the plastic sheet and further improving the use convenience of the mold equipment; the vent holes can effectively prevent the gas generated by the heating of the plastic sheet from accumulating in the cavity of the inner concave surface of the mold during the thermoforming process of the lunch box, avoiding the formation of bubbles or cavities, thereby ensuring the surface quality of the formed product and the uniformity of the internal structure. Description of the Drawings
[0018] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings.
[0019] Figure 1 It is a schematic structural diagram of the present invention.
[0020] Figure 2 It is a schematic structural diagram of the present invention without the plastic sheet assembled.
[0021] Figure 3 is Figure 2 an enlarged schematic structural diagram of part A in
[0022] Figure 4 It is a schematic cross-sectional structural diagram of another angle of the present invention.
[0023] Figure 5 is Figure 4 an enlarged schematic structural diagram of part B in
[0024] Figure 6 It is a schematic cross-sectional structural diagram of the lower template and its air cylinder in the present invention.
[0025] Figure 7 is Figure 6 an enlarged schematic structural diagram of part C in
[0026] Figure 8 It is a schematic top structural diagram of the lower template in the present invention.
[0027] Figure 9 is Figure 8 an enlarged schematic structural diagram of part D in
[0028] Figure 10 It is a schematic bottom structural diagram of the upper template in the present invention.
[0029] Figure 11 is Figure 10 an enlarged schematic structural diagram of part E in
[0030] Support 1, upper template 2, lower template 3, air cylinder 4, rotating shaft 5, conveyor wheel 6, sprocket set 7, pressing wheel 8, disc 9, circular cavity 10, ratchet 11, pawl 12, spring piece 13, spur gear 14, power rack 15, slide bar 16, abutting block 17, control rod 18, support spring 19, limit block 20, limit rod 21, elastic telescopic rod 22, friction block 23, limit post 24, sliding sleeve 25, synchronous gear 26, upper rack 27, lower rack 28, limit groove 29, chute 30, slide bar 31, top block 32, frustum 33, support plate 34, return spring 35, air cylinder 36, piston 37, exhaust pipe 38, intake pipe 39, check valve 40, air blowing hole 41, vertical rod 42, horizontal plate 43, pressing spring 44, limit hook 45, transmission shaft 46, crank 47, air vent hole 48. DETAILED DESCRIPTION
[0031] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0032] like Figure 1-11 As shown, a thermoforming mold for lunch box production includes a support 1, an upper template 2 and a lower template 3 are installed on the upper side of the support 1, a cylinder 4 fixed to the support 1 is vertically installed on the upper side of the upper template 2 of the support 1, the output end of the cylinder 4 is transmission-connected to the upper template 2, and a walking mechanism is symmetrically installed on the front and rear sides of the support 1; The walking mechanism includes rotating shafts 5 which are spaced apart from each other and are rotatably connected to the support 1. A transmission wheel 6 is drivingly connected to the rear side of each rotating shaft 5. A plurality of sprocket groups 7 are installed on the front side of the support 1. The sprocket groups 7 are arranged on the left and right sides and staggered front and back. The sprocket groups 7 adjacent to each other on the left and right sides are connected end to end. The plurality of rotating shafts 5 are respectively connected to the corresponding sprocket groups 7. A pressing wheel 8 matching with the transmission wheels 6 is rotatably installed on the upper side. A disc 9 rotatably connected to the support 1 is installed on the front side of the sprocket group 7, and the disc 9 is transmission connected to one of the rotating shafts 5. A circular cavity 10 is opened on the inner side of the disc 9, and a ratchet 11 is rotatably installed on the inner side of the circular cavity 10. A pawl 12 hinged to the circular cavity 10 is installed on the side of the ratchet 11, and a spring sheet 13 is installed on the side of the pawl 12. The two ends of the spring sheet 13 are respectively fixedly connected to the middle part of the pawl 12 and the side of the circular cavity 10. A spur gear 14 transmission connected to the ratchet 11 is rotatably installed on the front side of the disc 9, and a power rack 15 meshing with the spur gear 14 is vertically installed on the side of the spur gear 14, and the power rack 15 is transmission connected to the upper template 2.
[0033] When the present invention is in use, the thermoplastic plastic sheet to be processed is introduced between the transmission wheel 6 and the pressing wheel 8 on the left side. Each sprocket wheel group 7 includes a combination of two left and right sprocket wheels and a chain. Multiple groups of sprocket wheel groups 7 are connected end to end to realize that each transmission wheel 6 can rotate synchronously. The cylinder 4 on the upper side is used to drive the upper template 2 to move up and down so as to realize the rapid mold closing / opening with the lower template 3 and process the plastic sheet. When the upper template 2 moves downward, the power rack 15 drives the spur gear 14 to rotate, and at this time, a relative displacement is generated between the ratchet 11 and the disc 9, so that the plastic sheet will not move. After the lunch box is thermoplasticized, the upper template 2 moves upward to separate from the lower template 3. At this time, the spur gear 14 rotates in the opposite direction under the action of the power rack 15. At this time, the transmission wheel 6 rotates at the same time under the cooperation of the ratchet 11, the pawl 12 and the spring sheet 13, realizing the automatic displacement of the plastic sheet.
[0034] The coordination of the ratchet 11, the pawl 12, the spring sheet 13, the spur gear 14 and the power rack 15 enables the traveling mechanism to synchronously control the movement of the plastic sheet when the upper mold plate 2 and the lower mold plate 3 are opened, and to stop the movement of the plastic sheet during the thermoplastic operation of the mold. This arrangement makes full use of the energy of the cylinder 4, while also realizing automatic timing coordination between the mold and the traveling mechanism, reducing the possibility of finished product defects, and making the overall structure of the mold simple and reliable, reducing maintenance costs and the production cost of lunch boxes.
[0035] A slide bar 16 is vertically installed in the middle of the power rack 15 and is slidably connected to it up and down. An abutment block 17 that abuts against the power rack 15 is fixed at the bottom of the slide bar 16. A control rod 18 fixed to the upper template 2 is installed on the upper side of the slide bar 16. A support spring 19 is sleeved on the outer side of the slide bar 16. The upper and lower ends of the support spring 19 are fixedly connected to the control rod 18 and the power rack 15 respectively. A limit block 20 is fixed on the left side of the power rack 15, and a limit rod 21 matching the limit block 20 is fixed on the upper side of the support 1.
[0036] When the upper template 2 moves downward and has not completely merged with the lower template 3, the limit block 20 facilitates the abutment of the limit rod 21. At this time, the power rack 15 cannot move. When the lunch box is thermoformed and the upper template 2 moves upward and separates from the lower template 3 for a distance, the limit block 20 facilitates the separation of the limit rod 21. At this time, the abutment block 17 abuts against the lower side of the power rack 15. At this time, the support spring 19 cooperates with the abutment block 17 to simultaneously control the power rack 15 to move upward. At this time, the transmission wheel 6 starts to rotate under the action of the disc 9.
[0037] The cooperation of the sliding power rack 15, the supporting spring 19, the abutment block 17, the limit block 20 and the limit rod 21 ensures that the conveying wheel 6 can drive the plastic sheet to move only after the upper template 2 and the lower template 3 are separated to a certain distance, thereby preventing the plastic sheet from moving when the mold is not completely separated from the lunch box, thereby protecting the processed lunch box and improving the stability of the lunch box production process.
[0038] Each disc 9 is symmetrically provided with elastic telescopic rods 22 on both sides, and the elastic telescopic rods 22 are fixedly connected to the support 1. The disc 9 is provided with matching friction blocks 23 on both sides, and each friction block 23 is transmission-connected to the output end of the elastic telescopic rod 22 at the corresponding position.
[0039] The elastic telescopic rod 22 makes the friction block 23 always contact with the disc 9, so as not to affect the driving of the transmission wheel by the power rack 15, and prevent the transmission wheel 6 from accidentally rotating due to external force, thereby improving the transmission accuracy of the transmission wheel 6 for the plastic sheet.
[0040] A plurality of limiting columns 24 are vertically fixed to the upper side of the upper template 2 and the lower side of the lower template 3. A sliding sleeve 25 is sleeved outside the limiting column 24 and is slidably connected thereto. The sliding sleeves 25 on the upper and lower sides are both fixedly connected to the support 1. A synchronous component for controlling its position is installed on the side surface of the lower template 3.
[0041] The cooperation between the limiting rod 21 and the sliding sleeve 25 is used to limit the lateral positions of the upper template 2 and the lower template 3, so that the upper template 2 and the lower template 3 are more accurately closed, thereby enhancing the product consistency, ensuring the production quality of the lunch box, and improving the reliability of the mold.
[0042] There are two groups of synchronous components and they are symmetrically installed on the front and rear sides of the support 1. The synchronous component includes a synchronous gear 26 rotatably connected to the support 1. Upper racks 27 and lower racks 28 are symmetrically installed on the side circumference of the synchronous gear 26. The upper side of the upper rack 27 is fixedly connected to the upper template 2, and the lower side of the lower rack 28 is fixedly connected to the lower template 3.
[0043] The front and rear symmetric synchronous components enable the upper template 2 and the lower template 3 to run synchronously and in opposite directions through the cooperation of the upper rack 27, the lower rack 28 and the synchronous gear 26. This movement mode reduces the up and down displacement of the plastic sheet during the forming process, thereby improving the forming accuracy of the lunch box. At the same time, the driving of the cylinder 4 combined with the rack mechanism of the synchronous gear 26 ensures that the upper / lower template 3 moves synchronously and quickly, shortening the forming cycle.
[0044] A plurality of limiting grooves 29 are respectively opened on the middle and adjacent sides of the upper template 2 and the lower template 3. A vertically penetrating chute 30 is opened in the middle of each limiting groove 29. A sliding rod 31 is slidably installed up and down inside the chute 30. A top block 32 matching the limiting groove 29 is fixed to the lower end of the upper sliding rod 31 and the upper end of the lower sliding rod 31. A frustum 33 is fixed to the top end of the upper sliding rod 31 and the bottom end of the lower sliding rod 31. Support plates 34 are fixed to the upper side of the upper template 2 and the lower side of the lower template 3. A return spring 35 is sleeved outside the sliding rod 31. The upper and lower ends of the return spring 35 are respectively in transmission connection with the support plate 34 and the frustum 33. An air cylinder 36 is installed on the lower side of the lower template 3. A piston 37 matching the air cylinder 36 is assembled inside the air cylinder 36. The piston 37 is in transmission connection with the lower template 3. An exhaust pipe 38 is installed at the bottom of the air cylinder 36 and is connected to the air cylinder 36 through a pipeline. An air inlet pipe 39 is installed on the upper side of the exhaust pipe 38. A one-way valve 40 is installed in the middle of the air inlet pipe 39. Air blowing holes 41 respectively penetrating through the upper template 2 and the lower template 3 are opened on the side surfaces of the sliding rods 31. A plurality of air blowing holes 41 are all connected to the exhaust pipe 38 through pipelines.
[0045] When the upper template 2 and the lower template 3 are simultaneously merged toward the middle to close the film, the return spring 35 makes the top block 32 located inside the limit groove 29 to form a complete whole with the mold. At this time, the piston 37 moves upward, and the one-way valve 40 allows air to enter the inside of the air cylinder 36 through the air inlet pipe 39. When the upper template 2 and the lower template 3 are separated outward at the same time, the piston 37 moves downward and blows the air inside the cylinder into the blowing hole 41 through the exhaust pipe 38 and lifts the top block 32 and finally blows it between the upper template 2 and the lower template 3, so that the formed lunch box is separated from between the molds.
[0046] The piston 37 linked to the lower template 3 enables the lower template 3 to blow air into the lunch box through the exhaust pipe 38 via the compressed air through the air cylinder 36 when it moves downward, so that the thermoplasticized lunch box can be automatically demoulded when the upper template 2 and the lower template 3 are opened outward, ensuring that the mold can continue to operate, reducing manual dependence, and at the same time reducing the risk of damage to the lunch box when demoulding.
[0047] A plurality of vertical rods 42 spaced apart on the left and right sides are installed on the front and rear sides of the support 1. A horizontal plate 43 facing left and right is slidably connected on the upper side of the vertical rod 42. The pressing wheels 8 on the front and rear sides are rotatably connected to the horizontal plates 43 on the front and rear sides respectively. A pressing spring 44 is sleeved on the outer side of the vertical rod 42. The upper and lower ends of the pressing spring 44 are fixedly connected to the top of the vertical rod 42 and the upper side of the horizontal plate 43 respectively.
[0048] The cooperation between the horizontal plate 43 and the pressing spring 44 enables the pressing wheel 8 to always obtain downward pressure, thereby increasing the friction between the plastic sheet and the conveying wheel 6, preventing it from relative displacement with the conveying wheel 6 when moving, and further improving the movement accuracy of the plastic sheet when the mold is working. At the same time, the clamping force of the pressing wheel 8 on the material can be automatically adjusted to adapt to the production of lunch boxes of different thicknesses or materials.
[0049] Limiting hooks 45 are fixed to the lower side of the upper rack 27 and the upper side of the lower rack 28 . The lower limiting hook 45 abuts against the right side of the lower rack 28 , and the upper limiting hook 45 abuts against the left side of the upper rack 27 .
[0050] The upper and lower limit hooks 45 can assist in stabilizing the upper rack 27 and the lower rack 28, further improving the operational stability and reliability of the synchronization assembly.
[0051] A transmission shaft 46 that runs through the front and rear is rotatably installed on the left side of the support 1. The two leftmost transmission wheels 6 on the front and rear are both connected to the transmission shaft 46. The transmission shaft 46 has a crank handle 47 that is concentrically fixed on the front and rear.
[0052] The arrangement of the transmission shaft 46 and the cranks 47 on the front and rear sides allows the user to control the transmission wheel 6 to transmit the plastic sheet only by turning the crank 47 during installation, thereby facilitating the installation of the plastic sheet and further improving the ease of use of the mold equipment.
[0053] A plurality of air vents 48 penetrating up and down are evenly arranged inside the lower template 3.
[0054] During the thermoforming process of the lunch box, the air vents 48 can effectively prevent the gas generated by the heating of the plastic sheet from accumulating in the cavity of the concave surface inside the mold, avoiding the formation of bubbles or voids, thereby ensuring the surface quality of the formed product and the uniformity of the internal structure.
[0055] The above embodiments merely exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.
Claims
1. A thermoforming mold for lunch box production, comprising a support, an upper mold plate and a lower mold plate are mounted on the upper side of the support, characterized in that: A cylinder fixed to the support is vertically installed on the upper side of the support upper template, the output end of the cylinder is transmission-connected to the upper template, and a walking mechanism is symmetrically installed on the front and rear sides of the support; The walking mechanism includes rotating shafts that are spaced apart on the left and right and are rotatably connected to the support, and each of the rotating shafts is drivingly connected to a transmission wheel at the rear side, and a plurality of sprocket groups are installed on the front side of the support, and the sprocket groups are arranged on the left and right and staggered front and back, and the sprocket groups adjacent to the left and right are connected end to end in a driving manner, and the plurality of rotating shafts are respectively connected in a driving manner to the corresponding sprocket groups, and a plurality of pressing wheels that match the transmission wheels are rotatably installed on the upper side; A disc rotatably connected to the support is installed on the front side of the sprocket group, and the disc is transmission connected to one of the rotating shafts. A circular cavity is opened on the inner side of the disc, and a ratchet is rotatably installed on the inner side of the circular cavity. A pawl hinged to the circular cavity is installed on the side of the ratchet, and a spring sheet is installed on the side of the pawl, and the two ends of the spring sheet are respectively fixedly connected to the middle part of the pawl and the side of the circular cavity; a spur gear transmission connected to the ratchet is rotatably installed on the front side of the disc, and a power rack meshing with the spur gear is vertically installed on the side of the spur gear, and the power rack is transmission connected to the upper template.
2. A thermoforming mold for lunch box production according to claim 1, characterized in that: A sliding bar is vertically installed in the middle of the power rack and is slidably connected to it up and down. An abutment block that abuts against the power rack is fixed to the bottom of the sliding bar. A control rod fixed to the upper template is installed on the upper side of the sliding bar. A supporting spring is sleeved on the outer side of the sliding bar. The upper and lower ends of the supporting spring are respectively fixedly connected to the control rod and the power rack. A limiting block is fixed on the left side of the power rack, and a limiting rod matching the limiting block is fixed on the upper side of the support.
3. A thermoforming mold for lunch box production according to claim 2, characterized in that: Each of the discs is symmetrically provided with elastic telescopic rods, which are fixedly connected to the support. Friction blocks matching the elastic telescopic rods are provided on both sides of the discs, and each friction block is transmission-connected to the output end of the elastic telescopic rod at the corresponding position.
4. A thermoforming mold for lunch box production according to claim 3, characterized in that: A plurality of limit columns are vertically fixed on the upper side of the upper template and the lower side of the lower template. A sliding sleeve is sleeved on the outer side of the limit column and is slidably connected to the limit column. The sliding sleeves on the upper and lower sides are fixedly connected to the support. A synchronization component for controlling the position of the lower template is installed on the side.
5. A thermoforming mold for lunch box production according to claim 4, characterized in that: There are two groups of synchronization components, which are symmetrically installed on the front and rear sides of the support. The synchronization components include a synchronization gear rotatably connected to the support. The upper rack and the lower rack are symmetrically installed on the side surface of the synchronization gear. The upper side of the upper rack is fixedly connected to the upper template, and the lower side of the lower rack is fixedly connected to the lower template.
6. A thermoforming mold for lunch box production according to claim 5, characterized in that: The upper template is provided with a plurality of limit grooves on one side close to the middle of the lower template, and a sliding groove penetrating up and down is provided in the middle of each limit groove, a sliding rod is installed on the inner side of the sliding groove for upward and downward sliding sliding, and a top block matching the limit groove is fixed on the lower end of the upper sliding rod and the upper end of the lower sliding rod, a round table is fixed on the top end of the upper sliding rod and the bottom end of the lower sliding rod, a support plate is fixed on the upper side of the upper template and the lower side of the lower template, a return spring is sleeved on the outer side of the sliding rod, and the return spring The upper and lower ends of the spring are respectively connected to the support plate and the round table in a transmission connection. An air cylinder is installed on the lower side of the lower template, and a piston matching it is assembled on the inner side of the air cylinder. The piston is connected to the lower template in a transmission connection. An exhaust pipe connected to its pipeline is installed at the bottom of the air cylinder, and an air intake pipe is installed on the upper side of the exhaust pipe. A one-way valve is installed in the middle of the air intake pipe. Blowing holes are opened on the sides of the sliding rod, which pass through the upper template and the lower template respectively, and a plurality of the blowing holes are connected to the exhaust pipe pipeline.
7. A thermoforming mold for lunch box production according to claim 6, characterized in that: A plurality of vertical rods spaced apart left and right are installed on the front and rear sides of the support, and a left-right oriented horizontal plate is slidably connected to the upper side of the vertical rod, and the pressing wheels on the front and rear sides are rotatably connected to the horizontal plates on the front and rear sides respectively, and a pressing spring is sleeved on the outer side of the vertical rod, and the upper and lower ends of the pressing spring are fixedly connected to the top of the vertical rod and the upper side of the horizontal plate respectively.
8. A thermoforming mold for lunch box production according to claim 7, characterized in that: The lower side of the upper rack and the upper side of the lower rack are both fixed with limiting hooks, the limiting hook on the lower side abuts against the right side of the lower rack, and the limiting hook on the upper side abuts against the left side of the upper rack.
9. A thermoforming mold for lunch box production according to claim 8, characterized in that: A transmission shaft that runs through the front and back is rotatably installed on the left side of the support, and the two leftmost transmission wheels on the front and back are both connected to the transmission shaft in transmission, and the transmission shaft has concentrically fixed cranks on the front and back.
10. A thermoforming mold for lunch box production according to claim 9, characterized in that: A plurality of vertically penetrating air holes are evenly arranged on the inner side of the lower template.