Hot plate module and hot plate plastic welding machine comprising same

Abstract

The utility model relates to the technical field of plastic welding machine manufacturing, in particular to a hot plate module and a hot plate plastic welding machine comprising the same. For the hot plate module, the sliding table is loaded by the heavy frame, and is assisted by the synergistic effect of the guiding function part and the power part, so that the sliding table can perform reciprocating translational motion. The power part comprises a motor base, a motor, an external meshing gear transmission mechanism, a left gear and rack meshing transmission mechanism and a right gear and rack meshing transmission mechanism. The rotating torque released in the working process of the motor is transmitted to the left gear rack meshing transmission mechanism and the right gear rack meshing transmission mechanism through the external meshing gear transmission mechanism and is divided into two equal parts. Thus, on one hand, the sliding table has excellent stability in the running process, and then it is ensured that the welding face of the plastic workpiece is stably heated; and on the other hand, the power part has the design advantages of being high in transmission efficiency, accurate in transmission ratio and the like, and therefore the displacement speed and the stop stroke of the sliding table can be accurately controlled.

Description

Technical Field

[0001] This utility model relates to the field of plastic welding machine manufacturing technology, and in particular to a hot plate module and a hot plate plastic welding machine including the same. Background Technology

[0002] With the rapid development of modern industry, plastic welding technology is increasingly widely used in automotive parts manufacturing, electronic device packaging, and medical device production. Hot plate welding, with its ease of operation and wide applicability, has become a key technology in plastic welding processes. The performance of the hot plate module, as the core component of hot plate welding equipment, directly determines the welding quality and production efficiency.

[0003] Currently, most hot plate modules on the market have several shortcomings, especially in terms of power drive. Most employ a single-drive structure, commonly using a motor combined with a belt or chain to drive a sliding table for translational movement. The sliding table carries the hot plate, which consists of an upper and lower electric heating element. However, in practical applications, the following problems exist: 1) The smooth operation of the sliding table is difficult to guarantee, inevitably leading to deviations in the contact position between the hot plate and the welding surface of the plastic workpiece. This results in uneven heating of the welding surface, ultimately affecting welding accuracy and quality; 2) During power transmission, belt drives are prone to elastic slippage and chain drives suffer from polygonal effects, leading to unstable movement. This makes it difficult to precisely control the sliding table's speed and stopping stroke, failing to meet the accuracy requirements of different plastic materials and welding processes, thus inevitably affecting the stability of welding quality. Therefore, technical personnel urgently need to solve these problems. Utility Model Content

[0004] Therefore, in view of the above-mentioned existing problems and defects, the research and development team of this utility model collected relevant information, conducted multiple evaluations and considerations, and carried out continuous experiments and modifications by the research and development team members, which ultimately led to the emergence of this hot plate module.

[0005] To solve the aforementioned technical problems, this utility model relates to a hot plate module, which, with its function, melts the welding surface of a plastic workpiece due to heating. The hot plate module includes a support frame, a sliding table, an upper electric heating device, a lower electric heating device, a guide function unit, and a power unit. Both the upper and lower electric heating devices use the sliding table as their mounting base and are positioned opposite each other. The sliding table is supported by the support frame and, with the cooperation of the guide function unit and the power unit, performs reciprocating translational motion. The power unit includes a motor base, a motor, an external gear transmission mechanism, a left-side rack and pinion transmission mechanism, and a right-side rack and pinion transmission mechanism. The motor base is placed and fixed on the sliding table and positioned behind the upper electric heating device. The rotational torque released during the motor's operation is transmitted to the left-side and right-side rack and pinion transmission mechanisms via the external gear transmission mechanism, and is divided equally. The sliding table is displaced by the combined driving force from the left-mounted gear and rack meshing transmission mechanism and the right-mounted gear and rack meshing transmission mechanism.

[0006] As a further improvement to the technical solution disclosed in this utility model, the external gear transmission mechanism includes a primary driving gear, a primary driven gear, a transmission shaft, a left-side bearing housing, and a right-side bearing housing. The transmission shaft is used to synchronously drive the left-side gear rack and pinion transmission mechanism and the right-side gear rack and pinion transmission mechanism. Both the left-side and right-side bearing housings use a sliding table as their assembly base, and they cooperate to support the transmission shaft. The primary driving gear is directly driven by a motor. The primary driven gear is mounted on the transmission shaft.

[0007] As a further improvement to the technical solution disclosed in this utility model, the left-mounted gear and rack meshing transmission mechanism includes a left-mounted secondary driving gear and a left-mounted rack. The right-mounted gear and rack meshing transmission mechanism includes a right-mounted secondary driving gear and a right-mounted rack. Both the left-mounted and right-mounted secondary driving gears are mounted on a transmission shaft as their base. The left-mounted and right-mounted racks are both placed and fixed on a support frame and are symmetrically arranged on the left and right sides of the sliding table.

[0008] As a further improvement to the technical solution disclosed in this utility model, the external meshing gear transmission mechanism includes a center bearing housing. The left bearing housing, the right bearing housing, and the center bearing housing cooperate to support the transmission shaft. The center bearing housing is mounted on a motor mount.

[0009] As a further improvement to the technical solution disclosed in this utility model, the guiding function unit is composed of a left-side slide rail slider assembly and a right-side slide rail slider assembly. The left-side slide rail slider assembly includes a left-side slide rail and a left-side slider. The right-side slide rail slider assembly includes a right-side slide rail and a right-side slider. Both the left-side and right-side slide rails rest on a support frame and are fixed in a detachable manner. Both the left-side and right-side sliders are detachably fixed to the bottom wall of the sliding table; there are multiple of both types, and they are arranged linearly along the length of the sliding table.

[0010] As a further improvement to the technical solution disclosed in this utility model, the upper electric heating device and the lower electric heating device have the same design structure and installation method. The upper electric heating device includes an upper heat insulation plate, an upper support unit, and an upper plate-shaped electric heater. The upper heat insulation plate rests on a sliding platform and is fixed as a whole in a detachable manner. The upper plate-shaped electric heater is supported by the upper support unit and is positioned at a predetermined distance from the upper heat insulation plate. The upper support unit consists of multiple upper support columns arranged in a rectangular array to support the upper plate-shaped electric heater.

[0011] As a further improvement to the technical solution disclosed in this utility model, the upper-mounted electric heating device also includes an upper-mounted heat-conducting anti-stick plate. The upper-mounted heat-conducting anti-stick plate and the upper-mounted plate-shaped electric heater are assembled as one unit.

[0012] As a further improvement to the technical solution disclosed in this utility model, the upper electric heating device also includes a left limiting member and a right limiting member. Both the left and right limiting members are placed and fixed to the top wall of the upper plate-shaped electric heater, working together to limit the degree of freedom of movement of the upper heat-conducting anti-stick plate. Through milling, the left and right sides of the upper heat-conducting anti-stick plate are respectively formed with stepped longitudinal cross-sections for a left-side male insertion groove and a right-side male insertion groove. The left limiting member is formed with a left-side female insertion groove that matches the left-side male insertion groove. The right limiting member is formed with a right-side female insertion groove that matches the right-side male insertion groove.

[0013] A hot plate plastic welding machine includes the aforementioned hot plate module.

[0014] In practical applications, the hot plate module disclosed in this utility model can achieve at least the following beneficial technical effects, specifically:

[0015] 1) The rotational torque is transmitted in two equal parts to the left gear rack meshing transmission mechanism and the right gear rack meshing transmission mechanism through the external meshing gear transmission mechanism. The sliding table is simultaneously subjected to two unidirectional and equal drag forces, which helps to ensure that the sliding table has excellent stability in the process of performing reciprocating translational motion, and ensures that the upper electric heating device and the lower electric heating device are accurately aligned with the welding surface of the plastic workpiece, thereby ensuring the welding accuracy and quality.

[0016] 2) Whether it is an external meshing gear transmission mechanism, or a left-mounted gear rack meshing transmission mechanism and a right-mounted gear rack meshing transmission mechanism, they all have the characteristics of high transmission efficiency and accurate transmission ratio, which facilitates precise control of the displacement speed and stopping stroke of the sliding table, ensuring the stability and consistency of welding quality.

[0017] 3) Thanks to the setting of the guide function, the lateral displacement and deflection of the sliding table during the movement can be effectively limited, ensuring that it always maintains a stable trajectory during reciprocating motion. This allows both the upper and lower electric heating devices to be accurately aligned with the welding surface of the plastic workpiece, avoiding the occurrence of welding position deviation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional schematic diagram of the hot plate plastic welding machine disclosed in this utility model.

[0020] Figure 2 This is also a three-dimensional schematic diagram of the hot plate plastic welding machine disclosed in this utility model (with the double protective doors hidden).

[0021] Figure 3 yes Figure 2 The front view.

[0022] Figure 4 This is a schematic diagram showing the relative positions of the hot plate module after assembly in the hot plate plastic welding machine disclosed in this utility model.

[0023] Figure 5 This is a three-dimensional schematic diagram of the hot plate module in the hot plate plastic welding machine disclosed in this utility model.

[0024] Figure 6 yes Figure 5 The front view.

[0025] Figure 7 This is a three-dimensional schematic diagram of the power unit of the hot plate plastic welding machine disclosed in this utility model (the sliding table and the guide function unit are shown in the form of double-dotted lines).

[0026] Figure 8 This is a three-dimensional schematic diagram of the power unit of the hot plate plastic welding machine disclosed in this utility model from another perspective (the sliding table and the guide function unit are shown in the form of double-dotted lines).

[0027] Figure 9 This is a three-dimensional schematic diagram of the upper electric heating device in the hot plate plastic welding machine disclosed in this utility model.

[0028] Figure 10 yes Figure 9 Top view.

[0029] Figure 11 yes Figure 10 AA sectional view.

[0030] 1-Frame; 2-Hot plate module; 21-Supporting frame; 22-Sliding stage; 23-Upper electric heating device; 231-Upper heat insulation plate; 232-Upper support unit; 2321-Support column; 233-Upper plate-shaped electric heater; 234-Upper heat-conducting anti-stick plate; 2341-Left male slot; 2342-Right male slot; 235-Left limiting component; 2351-Left female slot; 236-Right limiting component; 2361-Right female slot; 24-Lower electric heating device; 25-Guide function unit; 251-Left slide rail slider assembly; 2511-Left slide rail; 2512-Left slider; 252-Right slide rail slider assembly; 2521-Right-positioned slide rail; 2522-Right-positioned slider; 26-Power unit; 261-Motor base; 262-Motor; 263-External meshing gear transmission mechanism; 2631-First-stage driving gear; 2632-First-stage driven gear; 2633-Transmission shaft; 2634-Left-positioned bearing housing; 2635-Right-positioned bearing housing; 2636-Middle-positioned bearing housing; 264-Left-positioned gear and rack meshing transmission mechanism; 2641-Left-positioned second-stage driving gear; 2642-Left-positioned rack; 265-Right-positioned gear and rack meshing transmission mechanism; 2651-Right-positioned second-stage driving gear; 2652-Right-positioned rack; 3-Upper clamp; 4-Lower clamp; 5-Double-opening protective door. Detailed Implementation

[0031] In the description of this utility model, it should be understood that the terms "left", "right", "front", "back", "up", "down", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] The present invention will be further described in detail below with reference to specific embodiments. Figure 1 , Figure 2 , Figure 3 , Figure 4The diagram shows the structure of the hot plate plastic welding machine disclosed in this utility model. It mainly consists of a frame 1, a hot plate module 2, an upper clamp 3, a lower clamp 4, a double-leaf protective door 5, and a control system. The frame 1, as the basic framework of the hot plate plastic welding machine, is generally made of high-strength steel, providing stable support for all components. The hot plate module 2 is used to melt the welding surface of the plastic workpiece through heat input. The upper clamp 3 and lower clamp 4 perform opposite / reverse displacement movements under driving force to approach / move away from the hot plate module 2. The upper clamp 3 and lower clamp 4 need to be customized according to the product and are used to fix the plastic workpiece to be welded. The double-leaf protective door 5 effectively isolates high-temperature components and moving mechanisms during the welding process, preventing burns and injuries from mechanical parts to the operator, while also facilitating the placement and removal of workpieces before and after welding. The control system uses a programmable logic controller (PLC) as its core, combined with a touch screen, sensors, etc., to achieve automated control and adjustment of parameters such as temperature, pressure, and time during the welding process.

[0033] As the core component of the hot plate welding equipment, the performance of the hot plate module 2 directly determines the welding quality and production efficiency. For example... Figure 5 , Figure 6 As shown in the diagram, the hot plate module 2 mainly consists of a support frame 21, a sliding platform 22, an upper electric heating device 23, a lower electric heating device 24, a guide function unit 25, and a power unit 26. The upper electric heating device 23 and the lower electric heating device 24 are both mounted on the sliding platform 22 and are positioned opposite each other. The sliding platform 22 is supported by the support frame 21 and, with the assistance of the guide function unit 25 and the power unit 26, performs reciprocating translational motion.

[0034] like Figure 7 As shown, the power unit 26 includes a motor mount 261, a motor 262, an external gear transmission mechanism 263, a left-side rack and pinion transmission mechanism 264, and a right-side rack and pinion transmission mechanism 265. The motor mount 261 is placed and fixed on the sliding stage 22 and is positioned behind the upper-mounted electric heating device 23. The rotational torque released by the motor 262 during its operation is transmitted to the left-side rack and pinion transmission mechanism 264 and the right-side rack and pinion transmission mechanism 265 via the external gear transmission mechanism 263, and is divided into two equal parts. The sliding stage 22 is displaced by the combined driving force from the left-side rack and pinion transmission mechanism 264 and the right-side rack and pinion transmission mechanism 265.

[0035] like Figure 8As shown, the external gear transmission mechanism 263 includes a primary driving gear 2631, a primary driven gear 2632, a transmission shaft 2633, a left bearing housing 2634, and a right bearing housing 2635. The transmission shaft 2633 synchronously drives the left and right gear rack transmission mechanisms 264 and 265. Both the left and right bearing housings 2634 and 2635 are mounted on a sliding table 22, and they cooperate to support the transmission shaft 2633. The primary driving gear 2631 is directly driven by a motor 262. The primary driven gear 2632 is mounted on the transmission shaft 2633.

[0036] Similarly, Figure 8 As shown, the left-mounted gear and rack meshing transmission mechanism 264 includes a left-mounted secondary drive gear 2641 and a left-mounted rack 2642. The right-mounted gear and rack meshing transmission mechanism 265 includes a right-mounted secondary drive gear 2651 and a right-mounted rack 2652. Both the left-mounted secondary drive gear 2641 and the right-mounted secondary drive gear 2651 are mounted on a transmission shaft 2633. The left-mounted rack 2642 and the right-mounted rack 2652 are both placed and fixed on the support frame 21 and are symmetrically arranged on the left and right sides of the sliding table 22.

[0037] When the motor 262 starts, the primary drive gear 2631 rotates due to the torque, and transmits the torque to the drive shaft 2633 via the primary driven gear 2632. During the rotation of the drive shaft 2633, the left-mounted secondary drive gear 2641 and the right-mounted secondary drive gear 2651 mounted on it also rotate. Under the meshing transmission of the gears and racks, the left rack 2642 and the right rack 2652 generate a horizontal driving force. Furthermore, the left-mounted rack and pinion meshing transmission mechanism 264 and the right-mounted rack and pinion meshing transmission mechanism 265 are symmetrically arranged, and the power is transmitted synchronously through the drive shaft 2633. Therefore, the driving forces generated on the left and right sides of the sliding table 22 are equal in magnitude and coordinated in direction, thus enabling the sliding table 22 to smoothly perform reciprocating translational motion.

[0038] In practical applications, the hot plate module disclosed in this utility model has achieved the following beneficial technical effects, specifically:

[0039] 1) The rotational torque is transmitted in two equal parts to the left gear and rack meshing transmission mechanism 264 and the right gear and rack meshing transmission mechanism 265 through the external meshing gear transmission mechanism 263. The sliding table 22 is simultaneously subjected to two unidirectional and equal drag forces, which helps to ensure that the sliding table 22 has excellent stability in the process of performing reciprocating translational motion, and ensures that the upper electric heating device 23 and the lower electric heating device 24 are accurately aligned with the welding surface of the plastic workpiece, thereby ensuring the welding accuracy and quality.

[0040] 2) Whether it is the external meshing gear transmission mechanism 263, or the left gear rack meshing transmission mechanism 264 and the right gear rack meshing transmission mechanism 265, they all have the characteristics of high transmission efficiency and accurate transmission ratio, which facilitates precise control of the displacement speed and stopping stroke of the sliding table 22, and ensures the stability and consistency of welding quality.

[0041] Similarly, Figure 8 As shown, the external gear transmission mechanism 263 includes a center bearing housing 2636. The left bearing housing 2634, right bearing housing 2635, and center bearing housing 2636 work together to support the transmission shaft 2633. The center bearing housing 2636 is mounted on the motor housing 261. Thus, thanks to the addition of the center bearing housing 2636, the support span of the transmission shaft 2633 is effectively shortened. This allows it to receive a more uniform support force during rotation, reducing deflection and deformation caused by its own weight and torque transmission, and preventing poor meshing due to bending or vibration of the transmission shaft 2633, thereby ensuring the smoothness and accuracy of power transmission in the power unit 26.

[0042] like Figure 5 , Figure 6 As shown, the guide function unit 25 is composed of a left slide rail slider assembly 251 and a right slide rail slider assembly 252. The left slide rail slider assembly 251 includes a left slide rail 2511 and a left slider 2512. The right slide rail slider assembly 252 includes a right slide rail 2521 and a right slider 2522. Both the left slide rail 2511 and the right slide rail 2521 rest on the support frame 21 and are fixed in a detachable manner. Both the left slider 2512 and the right slider 2522 are detachably fixed to the bottom wall of the sliding table 22. There are multiple of both, and they are arranged linearly along the length of the sliding table 22. By adopting the above technical solution, the lateral displacement and deflection of the sliding table 22 during the movement are effectively limited, ensuring that it always maintains a stable trajectory during reciprocating motion. This allows both the upper electric heating device 23 and the lower electric heating device 24 to be accurately aligned with the welding surface of the plastic workpiece, avoiding the occurrence of welding position deviation.

[0043] As shown in Figure 6, the upper electric heating device 23 and the lower electric heating device 24 have the same design structure and installation method.

[0044] To save space, this explanation will only focus on the upper-mounted electric heating device 23 as an example. Figures 9-11As shown, the upper-mounted electric heating device 23 mainly consists of an upper-mounted heat insulation plate 231, an upper-mounted support unit 232, and an upper-mounted plate-shaped electric heater 233. The upper-mounted heat insulation plate 231, used to block the heat conduction path, rests on the sliding stage 22 and is detachably fixed as a single unit. The upper-mounted plate-shaped electric heater 233 is supported by the upper-mounted support unit 232 and is positioned at a predetermined distance from the upper-mounted heat insulation plate 231. The upper-mounted support unit 232 consists of multiple upper-mounted support columns 2321 arranged in a rectangular array to support the upper-mounted plate-shaped electric heater 233. The upper-mounted plate-shaped electric heater 233 is the core heating component. When the power is turned on, current flows through the resistance wire (or other heating element) inside the upper-mounted plate-shaped electric heater 233, generating heat and rapidly heating the working surface of the upper-mounted plate-shaped electric heater 233. Since the upper plate-shaped electric heater 233 is opposite to the welding surface of the plastic workpiece, the high-temperature surface will transfer heat to the welding surface of the plastic workpiece through thermal radiation and thermal conduction. As heat is continuously transferred, the temperature of the welding surface of the plastic workpiece gradually rises until it reaches its melting point and begins to melt, preparing for subsequent welding operations.

[0045] It is known that during the heating of a plastic workpiece, molten plastic may come into direct contact with and adhere to the upper plate-shaped electric heater 233, making it difficult to remove. Furthermore, different parts of the upper plate-shaped electric heater 233 may experience temperature differences during operation. Therefore, as a further optimization of the above technical solution, similarly... Figures 9-11 As shown, the upper plate-shaped electric heater 233 is also equipped with an upper heat-conducting anti-stick plate 234. The upper heat-conducting anti-stick plate 234 is in close contact with the top wall of the upper plate-shaped electric heater 233. In this way, on the one hand, the upper heat-conducting anti-stick plate 234 acts as an intermediate isolation layer, separating the plastic workpiece from the upper plate-shaped electric heater 233 and preventing the upper plate-shaped electric heater 233 from being stuck to the molten plastic; on the other hand, the upper heat-conducting anti-stick plate 234 has good thermal conductivity. When it is in close contact with the upper plate-shaped electric heater 233, the upper heat-conducting anti-stick plate 234 can rapidly diffuse heat on its surface, making the temperature of the entire plate surface more uniform. This helps to ensure that all areas of the welding surface of the plastic workpiece are heated evenly, avoiding local overheating or underheating.

[0046] Finally, it should be noted that, as Figures 9-11As shown, the upper electric heating device 23 is also equipped with a left limiting member 235 and a right limiting member 236. Both the left limiting member 235 and the right limiting member 236 are placed and fixed to the top wall of the upper plate-shaped electric heater 233, working together to limit the degree of freedom of movement of the upper heat-conducting anti-stick plate 234. After milling, the left and right sides of the upper heat-conducting anti-stick plate 234 are respectively formed with stepped longitudinal cross-sections: a left-side male slot 2341 and a right-side male slot 2342. The left limiting member 235 is formed with a left-side female slot 2351 that matches the left-side male slot 2341. The right limiting member 236 is formed with a right-side female slot 2361 that matches the right-side male slot 2342. Thus, on the one hand, during installation, the upper heat-conducting anti-stick plate 234 can be simply inserted by aligning it with both the left and right mating slots 2351 and 2361. When cleaning, replacement, or other maintenance operations are required, the upper heat-conducting anti-stick plate 234 can be easily removed from the left and right limiting members 235 and 236, making the operation extremely simple and requiring no additional tools. On the other hand, when an external force attempts to displace the upper heat-conducting anti-stick plate 234, the left and right mating slots 2341 and 2351, as well as the right and right mating slots 2342 and 2361, interlock, preventing further movement and ensuring that the upper heat-conducting anti-stick plate 234 always maintains the correct relative position, allowing it to stably perform its heat-conducting and anti-sticking functions.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hot plate module, wherein the welding surface of a plastic workpiece melts due to heating; the hot plate module includes a support frame, a sliding stage, an upper electric heating device, a lower electric heating device, a guiding function part, and a power part; the upper electric heating device and the lower electric heating device are both mounted on the sliding stage as a mounting base and are positioned opposite each other; the sliding stage is supported by the support frame and, with the assistance of the guiding function part and the power part, performs a reciprocating translational motion, characterized in that... The power unit includes a motor base, a motor, an external gear transmission mechanism, a left-mounted gear and rack transmission mechanism, and a right-mounted gear and rack transmission mechanism. The motor base is placed and fixed on the sliding platform and is positioned behind the upper-mounted electric heating device. The rotational torque released by the motor during its operation is transmitted to the left-mounted gear and rack transmission mechanism and the right-mounted gear and rack transmission mechanism via the external gear transmission mechanism, and the transmission mechanism is divided into two equal parts. The sliding platform is displaced due to the combined driving force from the left-mounted gear and rack transmission mechanism and the right-mounted gear and rack transmission mechanism.

2. The hot plate module according to claim 1, characterized in that, The external meshing gear transmission mechanism includes a primary driving gear, a primary driven gear, a transmission shaft, a left-side bearing housing, and a right-side bearing housing. The transmission shaft is used to synchronously drive the left-side gear rack meshing transmission mechanism and the right-side gear rack meshing transmission mechanism. Both the left-side bearing housing and the right-side bearing housing use the sliding table as their assembly base, and they cooperate to support the transmission shaft. The primary driving gear is directly driven by the motor, while the primary driven gear is mounted on the transmission shaft.

3. The hot plate module according to claim 2, characterized in that, The left-mounted gear and rack meshing transmission mechanism includes a left-mounted secondary drive gear and a left-mounted rack; the right-mounted gear and rack meshing transmission mechanism includes a right-mounted secondary drive gear and a right-mounted rack; both the left-mounted secondary drive gear and the right-mounted secondary drive gear are mounted on the transmission shaft as the base; and both the left-mounted rack and the right-mounted rack are placed and fixed on the support frame and are symmetrically arranged on the left and right sides of the sliding table.

4. The hot plate module according to any one of claims 2-3, characterized in that, The external meshing gear transmission mechanism includes a center bearing housing; the left bearing housing, the right bearing housing, and the center bearing housing cooperate to support the transmission shaft; and the center bearing housing is mounted on the motor base.

5. The hot plate module according to claim 1, characterized in that, The guiding function unit is composed of a left-side slide rail slider assembly and a right-side slide rail slider assembly; the left-side slide rail slider assembly includes a left-side slide rail and a left-side slider; the right-side slide rail slider assembly includes a right-side slide rail and a right-side slider; both the left-side slide rail and the right-side slide rail rest on the support frame and are fixed in a detachable manner; both the left-side slider and the right-side slider are fixed to the bottom wall of the sliding platform in a detachable manner, and there are multiple of both, which are arranged linearly along the length of the sliding platform.

6. The hot plate module according to claim 1, characterized in that, The upper electric heating device and the lower electric heating device have the same design structure and installation method; the upper electric heating device includes an upper heat insulation plate, an upper support unit and an upper plate-shaped electric heater; the upper heat insulation plate is placed on the sliding platform and is fixed as a whole in a detachable manner; the upper plate-shaped electric heater is supported by the upper support unit and is set away from the upper heat insulation plate at a predetermined distance; The upper support unit consists of multiple upper support columns arranged in a rectangular array to support the upper plate-shaped electric heater.

7. The hot plate module according to claim 6, characterized in that, The upper-mounted electric heating device also includes an upper-mounted heat-conducting and anti-stick plate; the upper-mounted heat-conducting and anti-stick plate is assembled with the upper-mounted plate-shaped electric heater as a whole.

8. The hot plate module according to claim 7, characterized in that, The upper electric heating device also includes a left limiting member and a right limiting member; the left limiting member and the right limiting member are both placed and fixed on the top wall of the upper plate-shaped electric heater, and work together to limit the degree of freedom of movement of the upper heat-conducting and anti-stick plate; after milling, the left and right sides of the upper heat-conducting and anti-stick plate are respectively formed with stepped longitudinal cross-sections of left and right interlocking male slots; The left limiting member is formed with a left interlocking female groove that matches the left interlocking male groove; the right limiting member is formed with a right interlocking female groove that matches the right interlocking male groove.

9. A hot plate plastic welding machine, characterized in that, Includes the hot plate module as described in any one of claims 1-8.

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