Curing and leveling device for composite bipolar plate

Abstract

The invention relates to the technical field of bipolar plate production, in particular to a curing and leveling device for a composite bipolar plate, which comprises a water bath heating pool and a pressing frame assembly, the pressing frame assembly is arranged in the water bath heating pool, and the pressing frame assembly divides the water bath heating pool into a first chamber and a second chamber; the pressing frame assembly comprises a plurality of pressing plates which are sequentially arranged in the transverse direction, each pressing plate comprises a heat conduction plate, the heat conduction plates are completely immersed in water at the preset temperature in the water bath heating pool, flat channels used for communicating the first cavities with the second cavities are formed in the heat conduction plates in the longitudinal direction in a penetrating mode, and the bipolar plates are clamped between every two adjacent heat conduction plates; the tops of the pressing plates extend out of the water bath heating pool and are connected with a transverse frame, and the transverse frame is driven by a driving component to drive the heat conduction plate to longitudinally reciprocate in the water bath heating pool. According to the invention, the quality of the bipolar plate is obviously improved, the overall production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of bipolar plate production technology, specifically to a curing and leveling device for composite material bipolar plates. Background Technology

[0002] Bipolar plates are mainly composed of flexible graphite plates and organic resin. The basic production process is to first immerse the flexible graphite plate in the organic resin and use a positive and negative pressure environment to expel the air inside the flexible graphite plate, so that the organic resin can fill the pores of the flexible graphite plate. Then, the flexible graphite plate filled with organic resin is placed in a water bath environment for curing and leveling, and finally the bipolar plate is obtained.

[0003] For example, Chinese invention patent application CN114789528A discloses a water bath curing molding equipment and method for flexible graphite electrodes. This application uses a driving mechanism to press a mounting groove with elastic space within a flattening fixture in a water bath curing tank, thus curing the flexible graphite electrode in a flattened state. However, in practical use, it still has the following shortcomings: Because flexible graphite plates filled with organic resin (hereinafter referred to as graphite plates) need to be pressed to maintain a flat state using a flattening fixture, in actual production operations, to improve production efficiency, multiple graphite plates are often pressed and flattened at once. After pressing, the entire plate needs to be placed in a water bath environment for heating and curing. However, this operation method has obvious drawbacks. Specifically, because multiple graphite plates are arranged in a stacked manner, during water bath heating, the graphite plate in the middle position is tightly wrapped by the surrounding graphite plates, and heat transfer is hindered layer by layer. This makes it difficult for heat to be evenly transferred to the middle graphite plate, resulting in uneven heating of different parts and seriously affecting the quality of the bipolar plate. Moreover, the efficiency of heat absorption in the middle graphite plate is extremely low, requiring a long time to reach the required curing temperature, which in turn leads to a significant decrease in the overall curing speed, reducing production efficiency and increasing production costs. Summary of the Invention

[0004] The purpose of this invention is to provide a curing and leveling device for composite material bipolar plates to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a curing and leveling device for composite material bipolar plates, comprising a water bath heating tank and a pressure frame assembly, wherein the pressure frame assembly is disposed inside the water bath heating tank and the distance between the pressure frame assembly and the inner wall of the water bath heating tank is 0.5-3mm, and the pressure frame assembly divides the water bath heating tank into a first chamber and a second chamber. The pressure frame assembly includes several pressure plates arranged sequentially in the transverse direction. Each pressure plate includes a heat-conducting plate, which is completely immersed in water at a predetermined temperature inside the water bath heating tank. A flat channel for connecting the first chamber and the second chamber is opened longitudinally inside the heat-conducting plate. The bipolar plate is clamped between two adjacent heat-conducting plates. Several pressure plates extend to the outside of the water bath heating pool and are connected to a crossbeam. The crossbeam is driven by a drive component, which drives the heat-conducting plate to move longitudinally back and forth inside the water bath heating pool, so that water at a predetermined temperature inside the water bath heating pool flows inside the flat channel.

[0006] Preferably, the pressure plate further includes a first heat-resistant plate and a second heat-resistant plate made of a material with low thermal conductivity. The first heat-resistant plate and the second heat-resistant plate are respectively fixed to the upper and lower ends of the heat-conducting plate, and the thickness of the first heat-resistant plate and the second heat-resistant plate is the same as that of the heat-conducting plate. The top of the first heat-resistant plate is connected to the crossbar.

[0007] Preferably, a water-blocking frame is provided between two adjacent pressure plates, and the heat-conducting plate is located inside the water-blocking frame. The water-blocking frame includes two flat sides and two vertical sides. Grooves are provided on both sides of the first heat-insulating plate and both sides of the second heat-insulating plate. The horizontal sides of the flat edge are respectively set inside the two grooves. The horizontal width of the vertical edge is not less than twice the wall thickness of the heat-conducting plate, and the two vertical edges are respectively attached to the two longitudinal end faces of the heat-conducting plate.

[0008] Preferably, water-dividing ridges are formed at the two ends where the two vertical sides are separated, to guide the water flow into the interior of the flat channel.

[0009] Preferably, a magnet is embedded in the interior of the flat edge, and an iron block is embedded in the inner surface of the groove corresponding to the position of the magnet.

[0010] Preferably, one end face of the magnet is flush with one side of the flat edge in the horizontal direction, and there is a distance between the other end face of the magnet and the other side of the flat edge in the horizontal direction.

[0011] Preferably, the interior of the flat channel is provided with several turbulence plates, which are fixedly connected to the heat-conducting plate, and there is an angle between the turbulence plates and the extension direction of the flat channel.

[0012] Preferably, the crossbar includes two mounting seats and two transversely arranged guide rods fixedly connected between the two mounting seats. A guide sleeve is fixed to the top of the pressure plate and is slidably connected to the guide rods.

[0013] Preferably, the crossbar also includes a fixing plate and a screw, wherein the fixing plate is fixedly connected to the guide rod, the screw has a transverse thread passing through one of the mounting seats, and turning the screw can press several pressure plates onto the fixing plate, and a handle is fixed to one end of the screw.

[0014] Preferably, the drive components include a lead screw pair and a servo motor, wherein the lead screw pair is longitudinally mounted on the outer side of the water bath heating tank, and the servo motor is coaxially and fixedly connected to the lead screw of the lead screw pair; A positioning frame is provided between the lead screw pair and the cross frame. The positioning frame includes a positioning socket and a positioning rod that are connected by a plug-in connection. The positioning socket is fixedly connected to the nut of the lead screw pair, and the positioning rod is fixedly connected to the cross frame. The bottom end of the positioning rod is lower than the bottom end of the pressure plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a driving component to drive a frame assembly composed of several pressure plates to reciprocate within a water bath heating tank. In conjunction with heat-conducting plates with flat channels on the pressure plates, water at a predetermined temperature in the first and second chambers can circulate and exchange through the flat channels during the frame assembly's movement. This prevents localized overheating or underheating of the water within the heating tank, ensuring a constant water temperature. Consequently, the bipolar plates sandwiched between adjacent heat-conducting plates are uniformly heated, allowing the organic resin on the bipolar plates to cure at a constant temperature. This improves the quality of the cured bipolar plates. Furthermore, since this invention uses only one bipolar plate sandwiched between each pair of adjacent heat-conducting plates, regardless of the number of bipolar plates sandwiched within the frame assembly, each bipolar plate can be synchronously heated with consistent temperature rise across all positions. This significantly improves the quality of the bipolar plates, increases overall production efficiency, and reduces production costs.

[0016] The present invention, through the setting of a water-blocking frame, in conjunction with the grooves opened on the first heat-blocking plate and the second heat-blocking plate, can achieve full coverage of the bipolar plate when the two adjacent heat-conducting plates are clamped together, thereby preventing water from washing away the edges of the bipolar plate and improving the quality of the edge position of the bipolar plate after curing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the water bath heating tank of the present invention; Figure 3 This is a left-side view of the structure of the pressure frame assembly of the present invention when it is located outside the water bath heating tank; Figure 4 This is a schematic diagram of the structure of the pressure frame assembly and the cross frame of the present invention; Figure 5 This is a schematic diagram of the structure of the crossbeam and positioning frame of the present invention; Figure 6This is a schematic diagram of the structure of the pressure plate of the present invention; Figure 7 This is a schematic diagram of the structure of the pressure plate and water-blocking frame of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the exploded structure; Figure 9 This is a schematic diagram of the left-side structure of the water-blocking frame of the present invention; Figure 10 This is a schematic diagram of the cross-sectional structure of the flat side of the present invention; Figure 11 This is a schematic diagram of the cross-sectional structure of the vertical side of the present invention; Figure 12 This is a schematic cross-sectional view of the first heat-resistant plate and its flat edge according to the present invention. Figure 13 This is a schematic diagram of the internal structure of the heat-conducting plate of the present invention.

[0018] In the diagram: 1. Water bath heating tank; 101. First chamber; 102. Second chamber; 2. Pressure plate; 201. Heat-conducting plate; 202. First heat-resistant plate; 203. Second heat-resistant plate; 204. Flat channel; 205. Baffle plate; 206. Groove; 207. Iron block; 3. Horizontal frame; 301. Mounting base; 302. Guide rod; 303. Fixing plate; 304. Screw; 305. Handle; 306. Guide sleeve; 4. Positioning frame; 401. Positioning socket; 402. Positioning insert; 5. Lead screw pair; 6. Servo motor; 7. Water blocking frame; 701. Flat edge; 702. Vertical edge; 703. Magnet block; 704. Water dividing ridge. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-13 The present invention provides a technical solution: A curing and leveling device for composite bipolar plates includes a water bath heating tank 1 and a pressure frame assembly. The water bath heating tank 1 contains an appropriate amount of water and is capable of heating the water to a predetermined temperature, which is sufficient to cure the organic solvent on the flexible graphite plate filled with organic resin placed inside it. The method of heating the water in the water bath heating tank 1 is not limited here; for example, it can be heated with heat transfer oil or electrically, which are existing technologies and will not be elaborated upon here.

[0021] The pressure frame assembly is disposed inside the water bath heating tank 1, and the distance between the pressure frame assembly and the inner wall of the water bath heating tank 1 is 0.5-3mm. In this technical solution, the width direction of the water bath heating tank 1 can be defined as the left-right direction, and the length direction of the water bath heating tank 1 can be defined as the front-back direction. Based on this, the distance between the left side of the pressure frame assembly and the left side of the inner wall of the water bath heating tank 1 is 0.5-3mm, the distance between the right side of the pressure frame assembly and the right side of the inner wall of the water bath heating tank 1 is 0.5-3mm, and the distance between the bottom surface of the pressure frame assembly and the inner bottom surface of the water bath heating tank 1 is 0.5-3mm. In this embodiment, the distance between the pressure frame assembly and the inner wall of the water bath heating tank 1 can be set to 1mm. The purpose of this setting is to reduce the water flow between the pressure frame assembly and the inner wall of the water bath heating tank 1, so that the water in the first chamber 101 and the second chamber 102 can circulate as much as possible through the flat channel 204.

[0022] The flat channel 204 is provided with a few turbulence plates 205. The turbulence plates 205 are fixedly connected to the heat conduction plate 201, and there is an angle between the turbulence plates 205 and the extension direction of the flat channel 204. The function of the turbulence plates 205 is to change the water flow direction inside the flat channel 204 and make the water flow tumble, so as to heat the bipolar plate more evenly.

[0023] The pressure frame assembly divides the water bath heating pool 1 into a first chamber 101 and a second chamber 102. The pressure frame assembly includes several pressure plates 2 arranged sequentially along the transverse direction, i.e., the pressure plates 2 are arranged sequentially from left to right. In this technical solution, the pressure plate 2 includes a heat-conducting plate 201, which can be made of copper. The heat-conducting plate 201 has high thermal conductivity and can quickly transfer the temperature of the water to the bipolar plates, causing the organic resin on the bipolar plates to solidify. The heat-conducting plate 201 is completely immersed in water at a predetermined temperature inside the water bath heating pool 1. A flat channel 204 is longitudinally opened inside the heat-conducting plate 201 to connect the first chamber 101 and the second chamber 102. The bipolar plates are clamped between two adjacent heat-conducting plates 201. Furthermore, the bipolar plates abut against the heat-conducting plate 201 at positions corresponding to the flat channel 204, thus allowing the temperature of the water flowing inside the flat channel 204 to be evenly transferred to the bipolar plates.

[0024] Several pressure plates 2 extend from their tops to the outside of the water bath heating tank 1 and are connected to a crossbeam 3. The crossbeam 3 is driven by a drive component, causing the heat-conducting plate 201 to reciprocate longitudinally inside the water bath heating tank 1, so that water at a predetermined temperature inside the water bath heating tank 1 flows inside the flat channel 204. This not only keeps the water inside the water bath heating tank 1 flowing, preventing local high or low temperatures and ensuring a consistent water temperature throughout the water bath heating tank 1, but also uses the water flowing inside the flat channel 204 to heat the organic resin on the bipolar plate, further improving the temperature uniformity of the organic resin during the curing process.

[0025] In the above scheme, a pressure frame assembly composed of several pressure plates 2 is driven by a driving component to reciprocate inside the water bath heating tank 1. In conjunction with the heat-conducting plate 201 with a flat channel 204 on the pressure plate 2, water at a predetermined temperature in the first chamber 101 and the second chamber 102 can circulate and exchange through the flat channel 204 during the movement of the pressure frame assembly. This prevents localized excessively high or low water temperatures within the water bath heating tank 1, ensuring a constant water temperature through the flat channel 204. Consequently, the bipolar plates sandwiched between adjacent heat-conducting plates 201 can be uniformly heated, allowing the organic resin on the bipolar plates to complete the curing process at a constant temperature, thus improving the quality of the cured bipolar plates. Furthermore, since this technical solution only sandwiches one bipolar plate between each pair of adjacent heat-conducting plates 201, regardless of the number of bipolar plates sandwiched within the pressure frame assembly, each bipolar plate can be synchronously heated, and the heating amplitude at each position on the bipolar plate remains consistent. This significantly improves the quality of the bipolar plates, increases overall production efficiency, and reduces production costs.

[0026] Furthermore, in this technical solution, the pressure plate 2 also includes a first heat-resistant plate 202 and a second heat-resistant plate 203 made of a material with low thermal conductivity. For example, the first heat-resistant plate 202 and the second heat-resistant plate 203 can be made of high-temperature resistant plastic material, which can reduce the loss of heat in the water. The first heat-resistant plate 202 and the second heat-resistant plate 203 are respectively fixed to the upper and lower ends of the heat-conducting plate 201, and the thickness of the first heat-resistant plate 202 and the second heat-resistant plate 203 is the same as that of the heat-conducting plate 201, reducing the gap between two adjacent first heat-resistant plates 202 or two adjacent second heat-resistant plates 203, thereby reducing the water flow rate in the gap; the top of the first heat-resistant plate 202 is connected to the crossbar 3.

[0027] A water-blocking frame 7 is provided between two adjacent pressure plates 2. In this scheme, the function of the water-blocking frame 7 is to prevent water flow from washing away the organic resin at the edges of the bipolar plate and to improve the quality of the edges of the bipolar plate after curing.

[0028] Specifically, the heat-conducting plate 201 is located inside the water-blocking frame 7, which includes two flat sides 701 and two vertical sides 702. The two flat sides 701 and the two vertical sides 702 work together to form a square-shaped water-blocking frame 7. In actual use, the bipolar plate is located inside the water-blocking frame 7. The water-blocking frame 7, together with the two heat-conducting plates 201, fully encloses the bipolar plate, preventing water from washing away the edges of the bipolar plate.

[0029] Grooves 206 are provided on both sides of the first heat-insulating plate 202 and both sides of the second heat-insulating plate 203. When the bipolar plate is clamped between two adjacent heat-conducting plates 201, the two lateral sides of the flat edge 701 are respectively set inside the two grooves 206. At this time, the flat edge 701 does not restrict the distance between the two adjacent heat-conducting plates 201, ensuring that the bipolar plate is pressed between the two adjacent heat-conducting plates 201. The lateral width of the vertical edge 702 is not less than twice the wall thickness of the heat-conducting plate 201, and the two vertical edges 702 are respectively attached to the two longitudinal end faces of the heat-conducting plate 201 to achieve the purpose of water blocking. In this embodiment, the lateral width of the vertical edge 702 is equal to twice the wall thickness of the heat-conducting plate 201.

[0030] In the above scheme, by setting the water-blocking frame 7, in conjunction with the grooves 206 opened on the first heat-blocking plate 202 and the second heat-blocking plate 203, when the bipolar plate is clamped by the two adjacent heat-conducting plates 201, the two adjacent heat-conducting plates 201, together with the water-blocking frame 7, can achieve full coverage of the bipolar plate, thereby preventing water from washing away the edges of the bipolar plate and improving the quality of the edge position of the bipolar plate after curing.

[0031] Furthermore, water-dividing ridges 704 are formed on the two ends of the two vertical sides 702 that are separated, which are used to guide the water flow into the interior of the flat channel 204, reduce the resistance of the entire pressure frame assembly to reciprocate within the water bath heating pool 1, and reduce energy consumption.

[0032] Furthermore, a magnet 703 is embedded inside the flat edge 701, and an iron block 207 is embedded on the inner surface of the groove 206 corresponding to the position of the magnet 703. After the flat edge 701 is inserted into the groove 206, a magnetic attraction is generated between the magnet 703 and the iron block 207, which allows the two heat-conducting plates 201 to clamp the bipolar plate located between them under the action of the magnetic attraction, thereby improving the flatness of the bipolar plate.

[0033] Furthermore, one end face of the magnet 703 is flush with one side of the flat edge 701 in the horizontal direction, and there is a distance between the other end face of the magnet 703 and the other side of the flat edge 701 in the horizontal direction. Thus, the distance between the magnet 703 and the two iron blocks 207 corresponding to it is different, which will result in different magnitudes of the magnetic attraction force between the magnet 703 and the two iron blocks 207 corresponding to it. Thus, after the water bath is completed, during the process of pulling and separating the two heat-conducting plates 201, the water-blocking frame 7 can be attracted to the iron block 207 that is close to it by its built-in magnet 703, and the resistance when separating the two heat-conducting plates 201 is small.

[0034] The cross frame 3 includes two mounting bases 301 and two horizontally arranged guide rods 302 fixedly connected between the two mounting bases 301. The top of the pressure plate 2 is fixed with a guide sleeve 306, which is slidably connected to the guide rods 302, so that the distance between two adjacent pressure plates 2 can be easily adjusted.

[0035] Furthermore, the crossbar 3 also includes a fixing plate 303 and a screw 304. The fixing plate 303 is fixedly connected to the guide rod 302. The screw 304 is threaded laterally through one of the mounting seats 301. By turning the screw 304, several pressure plates 2 can be pressed onto the fixing plate 303. One end of the screw 304 is fixed with a handle 305 for easy turning.

[0036] In this technical solution, the driving components include a lead screw pair 5 and a servo motor 6. The lead screw pair 5 is longitudinally installed on the outer side of the water bath heating tank 1, and the servo motor 6 is coaxially and fixedly connected to the lead screw of the lead screw pair 5. The servo motor 6 can be used to drive the lead screw of the lead screw pair 5 to rotate, thereby driving the nut of the lead screw pair 5 to move linearly, thus completing the driving of the pressure frame assembly.

[0037] Furthermore, a positioning frame 4 is provided between the lead screw assembly 5 and the cross frame 3. The positioning frame 4 includes a positioning socket 401 and a positioning rod 402 that are plugged in, so that the cross frame 3 is connected to the lead screw assembly 5 by plugging in. The positioning socket 401 is fixedly connected to the nut of the lead screw assembly 5, and the positioning rod 402 is fixedly connected to the cross frame 3. The bottom end of the positioning rod 402 is lower than the bottom end of the pressure plate 2. During the process of inserting the cross frame 3 into the lead screw assembly 5 from top to bottom, since the bottom end of the positioning rod 402 is lower than the bottom end of the pressure plate 2, the bottom end of the positioning rod 402 will first be inserted into the inside of the positioning socket 401, and then the bottom end of the pressure plate 2 will enter the inside of the water bath heating pool 1. This can prevent the bottom end of the pressure plate 2 from scratching the inner surface of the water bath heating pool 1.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A curing and leveling device for composite material bipolar plates, comprising a water bath heating tank and a pressing frame assembly, characterized in that, The pressure frame assembly is installed inside the water bath heating pool, and the distance between the pressure frame assembly and the inner wall of the water bath heating pool is 0.5-3mm. The pressure frame assembly divides the water bath heating pool into a first chamber and a second chamber. The pressure frame assembly includes several pressure plates arranged sequentially in the transverse direction. Each pressure plate includes a heat-conducting plate, which is completely immersed in water at a predetermined temperature inside the water bath heating tank. A flat channel for connecting the first chamber and the second chamber is opened longitudinally inside the heat-conducting plate. The bipolar plate is clamped between two adjacent heat-conducting plates. Several pressure plates extend to the outside of the water bath heating pool and are connected to a crossbeam. The crossbeam is driven by a drive component, which drives the heat-conducting plate to move longitudinally back and forth inside the water bath heating pool, so that water at a predetermined temperature inside the water bath heating pool flows inside the flat channel.

2. The curing and leveling device for a composite material bipolar plate according to claim 1, characterized in that, The pressure plate also includes a first heat-resistant plate and a second heat-resistant plate made of a material with low thermal conductivity. The first heat-resistant plate and the second heat-resistant plate are fixed at the upper and lower ends of the heat-conducting plate, respectively, and the thickness of the first heat-resistant plate and the second heat-resistant plate is the same as that of the heat-conducting plate. The top of the first heat-resistant plate is connected to the crossbar.

3. The curing and leveling device for a composite material bipolar plate according to claim 2, characterized in that, A water-blocking frame is provided between two adjacent pressure plates, and the heat-conducting plate is located inside the water-blocking frame. The water-blocking frame includes two flat sides and two vertical sides. Grooves are provided on both sides of the first heat-insulating plate and both sides of the second heat-insulating plate. The horizontal sides of the flat edge are respectively set inside the two grooves. The horizontal width of the vertical edge is not less than twice the wall thickness of the heat-conducting plate, and the two vertical edges are respectively attached to the two longitudinal end faces of the heat-conducting plate.

4. The curing and leveling device for a composite material bipolar plate according to claim 3, characterized in that, Water-dividing ridges are formed at the two ends where the two vertical sides are separated, which are used to guide the water flow into the interior of the flat channel.

5. The curing and leveling device for a composite material bipolar plate according to claim 3, characterized in that, A magnet is embedded inside the flat edge, and an iron block is embedded on the inner surface of the groove corresponding to the position of the magnet.

6. The curing and leveling device for a composite material bipolar plate according to claim 5, characterized in that, One end face of the magnet is flush with one of the horizontal sides of the flat edge, and there is a distance between the other end face of the magnet and the other horizontal side of the flat edge.

7. The curing and leveling device for a composite material bipolar plate according to claim 1, characterized in that, The flat channel is equipped with several turbulence plates inside. The turbulence plates are fixedly connected to the heat conduction plate, and there is an angle between the turbulence plates and the extension direction of the flat channel.

8. The curing and leveling device for a composite material bipolar plate according to claim 1, characterized in that, The crossbar includes two mounting bases and two transversely arranged guide rods fixedly connected between the two mounting bases. A guide sleeve is fixed to the top of the pressure plate and is slidably connected to the guide rods.

9. The curing and leveling device for a composite material bipolar plate according to claim 8, characterized in that, The crossbar also includes a fixing plate and a screw. The fixing plate is fixedly connected to the guide rod, and the screw has a transverse thread that passes through one of the mounting seats. Tightening the screw can press several pressure plates onto the fixing plate. One end of the screw is fixed with a handle.

10. The curing and leveling device for a composite material bipolar plate according to claim 1, characterized in that, The drive components include a lead screw pair and a servo motor. The lead screw pair is longitudinally mounted on the outer side of the water bath heating tank, and the servo motor is coaxially and fixedly connected to the lead screw of the lead screw pair. A positioning frame is provided between the lead screw pair and the cross frame. The positioning frame includes a positioning socket and a positioning rod that are connected by a plug-in connection. The positioning socket is fixedly connected to the nut of the lead screw pair, and the positioning rod is fixedly connected to the cross frame. The bottom end of the positioning rod is lower than the bottom end of the pressure plate.

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