Hot plate plastic welding machine and mold changing method thereof

Abstract

The invention relates to the technical field of hot plate plastic welding machine manufacturing, in particular to a hot plate plastic welding machine and a mold changing method thereof. As for the hot plate plastic welding machine, a mold changing auxiliary part is additionally arranged on the hot plate plastic welding machine. The die replacement auxiliary part is composed of an upper die replacement auxiliary sub-part and a lower die replacement auxiliary sub-part. Under the action of the upper die replacement auxiliary sub-part, the upper clamping module is directionally combined / separated relative to the thermal module; and under the action of the lower die replacement auxiliary sub-part, the lower clamping module is directionally combined / separated relative to the thermal module. In this way, on one hand, micron-level positioning precision in the die changing process can be achieved easily; and on the other hand, on the premise that the die change alignment precision of the upper clamping module, the hot module and the lower clamping module is guaranteed, the die change time and the downtime caused by die change are greatly shortened, and meanwhile the welding yield is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of hot plate plastic welding machine manufacturing, and particularly to a hot plate plastic welding machine and a die-changing method thereof. Background Art

[0002] In the field of plastic welding, hot plate plastic welding machines are widely used in industries such as automotive parts manufacturing and household appliance production due to their efficient and reliable welding performance. A hot plate plastic welding machine generally includes basic structures such as a frame, a hot module, an upper clamping module, a lower clamping module, and a driving platform. During actual operation, the hot module, the upper clamping module, and the lower clamping module change their orientations due to the traction force of the supporting driving platform, so as to realize the welding operation of plastic parts. The existing hot plate plastic welding machines have some obvious deficiencies in actual applications, specifically manifested as follows: 1) During the die-changing process, the combination / detachment of the upper clamping module, the lower clamping module and the hot module mainly rely on manual operation or simple mechanical positioning, so the die-changing process is cumbersome and time-consuming, resulting in an increase in equipment downtime and low production efficiency; 2) Due to the lack of effective die-changing guiding measures, it is difficult to ensure the accurate alignment of the upper clamping module, the lower clamping module and the hot module during the die-changing process. As a result, the alignment deviation of the two plastic parts to be welded is bound to exceed the reasonable value, and finally the welding defect rate remains high, increasing the production cost and scrap rate of products; 3) With the continuous increase in the market's diverse demand for plastic products, enterprises need to frequently change molds to adapt to the production of different products. The defects of traditional hot plate plastic welding machines in die-changing efficiency and accuracy have become important factors restricting the production flexibility of enterprises and the improvement of product quality. Therefore, there is an urgent need for a technical solution for a hot plate plastic welding machine that can achieve rapid die-changing and ensure the alignment accuracy after die-changing. Summary of the Invention

[0003] Therefore, in view of the above existing problems and defects, the designers of the present invention collected relevant materials, evaluated and considered them from multiple aspects, and through continuous experiments and modifications by technical personnel with many years of R & D experience in this industry, finally led to the emergence of this hot plate plastic welding machine.

[0004] The present invention relates to a hot plate plastic welder, which includes a frame, a hot module, an upper clamping module, a lower clamping module, a first driving platform, a second driving platform and a third driving platform. The first driving platform, the second driving platform and the third driving platform are respectively used to carry the hot module, the upper clamping module and the lower clamping module in a one-to-one correspondence, and all three use the frame as the installation and fixing basis. After the hot module is translated to the working position under the traction force from the first driving platform, the upper clamping module and the lower clamping module occupying the working position perform displacement movements towards the hot module respectively under the traction forces from the second driving platform and the third driving platform. Furthermore, the hot plate plastic welder further includes a die-changing auxiliary part. The die-changing auxiliary part is composed of an upper die-changing auxiliary sub-part and a lower die-changing auxiliary sub-part. Under the action of the upper die-changing auxiliary sub-part, the upper clamping module can be directionally combined with / detached from the hot module; under the action of the lower die-changing auxiliary sub-part, the lower clamping module can be directionally combined with / detached from the hot module.

[0005] As a further improvement of the technical solution disclosed by the present invention, the upper die-changing auxiliary sub-part includes an upper first centering guide sleeve, an upper second centering guide sleeve and an upper centering guide post. The upper first centering guide sleeve and the upper second centering guide sleeve are respectively based on the upper clamping module and the hot module as the installation basis in a one-to-one correspondence. The lower die-changing auxiliary sub-part includes a lower first centering guide sleeve, a lower second centering guide sleeve and a lower centering guide post. The lower first centering guide sleeve and the lower second centering guide sleeve are respectively based on the lower clamping module and the hot module as the installation basis in a one-to-one correspondence. And after the upper clamping module, the lower clamping module and the hot module are pre-assembled and combined, with the synergistic action of the upper centering guide post and the lower centering guide post, the upper first centering guide sleeve can be coaxial with the upper second centering guide sleeve, the lower first centering guide sleeve can be coaxial with the lower second centering guide sleeve, and the upper centering guide post can be coaxial with the lower centering guide post, and the upper clamping module and the lower clamping module are kept in the aligned state.

[0006] As a further improvement of the technical solution disclosed by the present invention, the number of the upper first centering guide sleeve, the upper second centering guide sleeve, the upper centering guide post, the lower first centering guide sleeve, the lower second centering guide sleeve and the lower centering guide post is the same, all being N, and N≥2.

[0007] As a further improvement of the technical solution disclosed in the present invention, the hot plate plastic welder further includes a plastic part alignment assisting part. The plastic part alignment assisting part includes a guide pin and a guide sleeve. The guide pin takes the upper clamping module as the installation base, and the guide sleeve adapted to the guide pin takes the lower clamping module as the installation base. After the plastic parts to be pre-welded are heated, during the process of the upper clamping module moving towards the lower clamping module, the guide pin gradually penetrates into the guide sleeve, and during this process, the alignment accuracy of the two plastic parts to be pre-welded is synchronously corrected.

[0008] Furthermore, the present invention also discloses a die-changing method for a hot plate plastic welder, which is realized by means of the above-mentioned hot plate plastic welder; The die-changing method for a hot plate plastic welder includes the following steps: S1. The upper clamping module, the hot module, and the lower clamping module are pre-assembled into one body and placed in front of the hot plate plastic welder; S2. The first driving platform performs a forward translation movement to receive the hot module and locks the hot module and the first driving platform into one body; S3. The first driving platform performs a backward translation movement until the upper clamping module, the hot module, and the lower clamping module occupy the working position; S4. The second driving platform performs a descending movement until it contacts the upper clamping module and locks the upper clamping module and the second driving platform into one body. At the same time, the third driving platform performs an ascending movement until it contacts the lower clamping module and locks the lower clamping module and the third driving platform into one body; S5. The second driving platform performs an ascending movement. The upper clamping module is separated from the hot module due to the traction force from the second driving platform. During this process, the upper first centering guide sleeve gradually moves away from the upper second centering guide sleeve until the upper centering guide post loses its centering and guiding function. At the same time, the third driving platform performs a descending movement. The lower clamping module is separated from the hot module due to the traction force from the third driving platform. During this process, the lower first centering guide sleeve gradually moves away from the lower second centering guide sleeve until the lower centering guide post loses its centering and guiding function.

[0009] As a further improvement of the technical solution disclosed in the present invention, in step S4, the displacement speed of the second driving platform is V1, and the displacement speed of the third driving platform is V2. In step S5, the displacement speed of the second driving platform is V3, and the displacement speed of the third driving platform is V4. Then V1 < V3 ≤ 0.8 m / min, V2 < V4 ≤ 0.8 m / min.

[0010] Regarding the hot plate plastic welder, in practical applications, it can achieve at least the following beneficial technical effects: specifically, 1) After the upper clamping module, the lower clamping module and the heating module are pre-assembled and combined, the upper centering guide post and the lower centering guide post cooperate with each other to ensure good coaxiality among the upper first centering guide sleeve, the upper second centering guide sleeve, the lower first centering guide sleeve and the lower second centering guide sleeve, and at the same time ensure that the upper clamping module and the lower clamping module are in exact alignment, thus facilitating the realization of micron-level positioning accuracy during the mold change process; 2) In actual production, on the premise that the alignment accuracy of each module is ensured after the mold change, both the mold change time and the downtime caused by the mold change are significantly reduced, and at the same time, the welding yield rate is ensured, and both the production efficiency and the product quality are significantly improved; 3) The heating module, the upper clamping module and the lower clamping module are respectively carried by the first driving platform, the second driving platform and the third driving platform. Thanks to the independent driving design framework, when the mold change instruction is issued, the upper clamping module, the lower clamping module and the heating module all have extremely fast response speeds, which is conducive to shortening the positioning time of each module, and thus laying a good foundation for rapid mold change.

[0011] Regarding the theme of the mold change method of the hot plate plastic welder, it can at least achieve the following beneficial technical effects in practical applications, specifically: 1) Adopting modular pre-installation, after the pre-installation is completed, the upper clamping module, the heating module and the lower clamping module are integrally placed in front of the hot plate plastic welder, and through the forward and backward translation of the first driving platform, the module combination is quickly positioned to the working position, greatly reducing the installation and debugging time of multiple components separately, being applicable to the scenario of frequent mold change, effectively reducing the downtime duration, and improving the mold change efficiency; 2) During the mold change process, the first driving platform, the second driving platform, the third driving platform and the mold change auxiliary part cooperate closely to ensure good alignment accuracy among the upper clamping module, the heating module and the lower clamping module, and thus avoid the occurrence of the phenomenon that the welding quality is affected due to misalignment; 3) The pre-installation and automatic traction design of the upper clamping module, the heating module and the lower clamping module help to reduce manual intervention, reduce the risk of operation errors, and improve stability and safety. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0013] Figure 1It is a three-dimensional schematic diagram of the hot plate plastic welder disclosed in the present invention (with the split protective door hidden).

[0014] Figure 2 It is Figure 1 the front view of.

[0015] Figure 3 It is also a three-dimensional schematic diagram of the hot plate plastic welder disclosed in the present invention (with the frame, split protective door, upper clamping module and second driving platform hidden).

[0016] Figure 4 It is a schematic diagram of the state after the upper clamping module and the second driving platform in the hot plate plastic welder disclosed in the present invention are docked.

[0017] Figure 5 It is a three-dimensional schematic diagram of the first driving platform in the hot plate plastic welder disclosed in the present invention.

[0018] Figure 6 It is a three-dimensional schematic diagram of the second driving platform in the hot plate plastic welder disclosed in the present invention.

[0019] Figure 7 It is a three-dimensional schematic diagram of the third driving platform in the hot plate plastic welder disclosed in the present invention.

[0020] Figure 8 It is a three-dimensional schematic diagram of the heating module in the hot plate plastic welder disclosed in the present invention.

[0021] Figure 9 It is a three-dimensional schematic diagram of the upper clamping module in the hot plate plastic welder disclosed in the present invention.

[0022] Figure 10 It is a three-dimensional schematic diagram of the lower clamping module in the hot plate plastic welder disclosed in the present invention.

[0023] Figure 11 It is a schematic diagram of the state after the upper clamping module, the lower clamping module and the heating module in the hot plate plastic welder disclosed in the present invention are pre-assembled and combined.

[0024] Figure 12 It is Figure 11 the front view of.

[0025] Figure 13 It is a schematic diagram of the state after the upper clamping module and the lower clamping module in the hot plate plastic welder disclosed in the present invention are docked (the plastic parts to be welded have been heated).

[0026] Figure 14 It is Figure 13 the partial enlarged view I of.

[0027] 1 - Frame; 2 - Thermal module; 21 - Upper heating plate; 22 - Lower heating plate; 3 - Upper clamping module; 4 - Lower clamping module; 5 - First driving platform; 6 - Second driving platform; 7 - Third driving platform; 8 - Die change auxiliary part; 81 - Upper die change auxiliary sub - part; 811 - Upper first centering guide sleeve; 812 - Upper second centering guide sleeve; 813 - Upper centering guide post; 82 - Lower die change auxiliary sub - part; 821 - Lower first centering guide sleeve; 822 - Lower second centering guide sleeve; 823 - Lower centering guide post; 9 - Plastic part alignment auxiliary part; 91 - Guide pin; 92 - Alignment sleeve. Detailed implementation mode

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "front", "rear", "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0029] The following combines specific embodiments to further elaborate on the content of the present invention. As Figures 1 to 4 shown in the figure, the hot - plate plastic welder mainly consists of a frame 1, a thermal module 2, an upper clamping module 3, a lower clamping module 4, a first driving platform 5, a second driving platform 6, and a third driving platform 7, etc. Figures 5 to 10 Stereo diagrams of the first driving platform 5, the second driving platform 6, the third driving platform 7, the thermal module 2, the upper clamping module 3, and the lower clamping module 4 are respectively shown. The first driving platform 5, the second driving platform 6, and the third driving platform 7 are respectively used to carry the thermal module 2, the upper clamping module 3, and the lower clamping module 4 in a one - to - one correspondence, and all three use the frame 1 as the installation and fixing foundation. Both the upper clamping module 3 and the lower clamping module 4 are used to position and clamp the plastic parts to be welded, and the thermal module 2 serves as the heat source for the plastic parts to be welded to be heated and melted. After the thermal module 2 is translated to the working position under the traction of the first driving platform 5, the upper clamping module 3 and the lower clamping module 4 occupying the working position move towards the thermal module 2 under the traction of the second driving platform 6 and the third driving platform 7 respectively until both plastic parts to be welded are in contact with the thermal module 2, and their welding edges are melted due to continuous heat input.

[0030] Considering both improving the die - change efficiency and the positioning accuracy after die - change, as a further optimization of the above - mentioned technical solution, as Figure 8 、 Figure 11 、 Figure 12As shown, the hot plate plastic welding machine is also provided with a die change auxiliary part 8. The die change auxiliary part 8 is composed of an upper die change auxiliary sub-part 81 and a lower die change auxiliary sub-part 82. Under the action of the upper die change auxiliary sub-part 81, the upper clamping module 3 can be directionally combined with / detached from the hot module 2; under the action of the lower die change auxiliary sub-part 82, the lower clamping module 4 can be directionally combined with / detached from the hot module 2. In this way, after the actual die change is completed, on the premise that the alignment accuracy of the hot module 2, the upper clamping module 3 and the lower clamping module 4 is guaranteed, both the die change time and the downtime caused by die change are greatly reduced, while ensuring the welding qualification rate, and the production efficiency and product quality are significantly improved.

[0031] Here, it should also be noted that the hot module 2, the upper clamping module 3, and the lower clamping module 4 are respectively carried by the first driving platform 5, the second driving platform 6, and the third driving platform 7. Thanks to the independent driving design framework, when the die change instruction is issued, the upper clamping module 3, the lower clamping module 4, and the hot module 2 all have extremely fast response speeds, which is conducive to shortening their respective positioning times, and thus laying a good foundation for rapid die change.

[0032] As a further refinement of the above technical solution, as Figure 11 、 Figure 12 shown, the upper die change auxiliary sub-part 81 includes an upper first centering guide sleeve 811, an upper second centering guide sleeve 812, and an upper centering guide post 813. The upper first centering guide sleeve 811 and the upper second centering guide sleeve 812 are respectively based on the upper clamping module 3 and the hot module 2 as the installation bases. The lower die change auxiliary sub-part 82 includes a lower first centering guide sleeve 821, a lower second centering guide sleeve 822, and a lower centering guide post 823. The lower first centering guide sleeve 821 and the lower second centering guide sleeve 822 are respectively based on the lower clamping module 4 and the hot module 2 as the installation bases. The numbers of the upper first centering guide sleeve 811, the upper second centering guide sleeve 812, the upper centering guide post 813, the lower first centering guide sleeve 821, the lower second centering guide sleeve 822, and the lower centering guide post 823 are the same, all being N, and N≥2. In actual operation, after the upper clamping module 3, the lower clamping module 4 and the hot module 2 are pre-assembled and combined, the upper centering guide post 813 and the lower centering guide post 823 act together to ensure good coaxiality between the upper first centering guide sleeve 811, the upper second centering guide sleeve 812, the lower first centering guide sleeve 821 and the lower second centering guide sleeve 822, and at the same time ensure that the upper clamping module 3 and the lower clamping module 4 are kept in correct alignment, so as to facilitate the realization of micron-level positioning accuracy during the die change process.

[0033] As Figure 2 、 Figure 9 、Figure 10 , Figure 13 , Figure 14 As shown in Figure 10 , Figure 13 , and Figure 14 , the hot plate plastic welder is also equipped with a plastic part alignment auxiliary part 9. The plastic part alignment auxiliary part 9 includes a guide pin 91 and a guide sleeve 92. The guide pin 91 takes the upper clamping module 3 as the installation basis, and the guide sleeve 92 adapted to the guide pin 91 takes the lower clamping module 4 as the installation basis. After the plastic parts to be pre-welded are heated, during the process of the upper clamping module 3 moving towards the lower clamping module 4, the guide pin 91 gradually penetrates into the guide sleeve 92, and during this process, the alignment accuracy of the two plastic parts to be pre-welded is corrected synchronously.

[0034] Here, it should also be noted that in actual production, if it is necessary to improve or upgrade the welding process, for example, to add more alignment control points, based on the existing structure of the plastic part alignment auxiliary part 9, it can be easily expanded and improved. For example, without changing the overall equipment structure, by increasing the number of guide pins 91 and guide sleeves 92 and optimizing their layout, etc., to improve the alignment accuracy and welding quality of the two plastic parts to be pre-welded.

[0035] Furthermore, the present invention also discloses a die-changing method for a hot plate plastic welder, which is realized by means of the above-mentioned hot plate plastic welder; The die-changing method for the hot plate plastic welder includes the following steps: S1. The upper clamping module 3, the heating module 2, and the lower clamping module 4 are pre-assembled into one body and placed in front of the hot plate plastic welder; S2. The first driving platform 5 performs a forward translation movement to receive the heating module 2 and locks the heating module 2 and the first driving platform 5 into one body; S3. The first driving platform 5 performs a backward translation movement until the upper clamping module 3, the heating module 2, and the lower clamping module 4 occupy the working position; S4. The second driving platform 6 performs a descending movement until it contacts the upper clamping module 3 and locks the upper clamping module 3 and the second driving platform 6 into one body. At the same time, the third driving platform 7 performs an ascending movement until it contacts the lower clamping module 4 and locks the lower clamping module 4 and the third driving platform 7 into one body; S5. The second driving platform 6 performs a rising movement. Due to the traction force from the second driving platform 6, the upper clamping module 3 is separated from the thermal module 2. During this process, the upper first centering guide sleeve 811 gradually moves away from the upper second centering guide sleeve 812 until the upper centering guide post 813 loses its centering and guiding function. At the same time, the third driving platform 7 performs a descending movement. Due to the traction force from the third driving platform 7, the lower clamping module 4 is separated from the thermal module 2. During this process, the lower first centering guide sleeve 821 gradually moves away from the lower second centering guide sleeve 822 until the lower centering guide post 823 loses its centering and guiding function.

[0036] In practical applications, on the one hand, modular pre-installation is adopted. After pre-installation, the upper clamping module 3, the thermal module 2, and the lower clamping module 4 are integrally placed in front of the hot plate plastic welder. And through the forward and backward translation of the first driving platform 5, the module combination can be quickly positioned to the working position, greatly reducing the installation and debugging time of multiple components separately. It is suitable for scenarios with frequent mold changes, effectively reducing the downtime and improving the mold change efficiency. On the other hand, during the mold change process, the first driving platform 5, the second driving platform 6, and the third driving platform 7 cooperate closely with the mold change auxiliary part 8 to ensure good alignment accuracy between the upper clamping module 3, the thermal module 2, and the lower clamping module 4, thereby avoiding the occurrence of phenomena that affect the welding quality due to misalignment.

[0037] Considering ensuring the smoothness of mold change, as a further optimization of the above technical solution, in step S4, the displacement speed of the second driving platform 6 is V1, and the displacement speed of the third driving platform 7 is V2. In step S5, the displacement speed of the second driving platform 6 is V3, and the displacement speed of the third driving platform 7 is V4. Then V1 < V3 ≤ 0.8 m / min, V2 < V4 ≤ 0.8 m / min. In step S4, the second driving platform 6 and the third driving platform 7 can touch and lock the upper clamping module 3 and the lower clamping module 4 respectively at a very low speed, which helps to avoid the impact force caused by too high a speed. On the premise of ensuring smoothness and safety, the displacement speeds of the second driving platform 6 and the third driving platform 7 in step S5 are increased relative to step S4. Appropriately increasing the speed can reduce the time spent in the separation process of the upper clamping module 3 and the lower clamping module 4 from the thermal module 2, thereby improving the efficiency of the entire mold change process. And limiting the speed within a certain range can not only achieve rapid separation but also avoid negative impacts caused by too high a speed, which helps to perform the mold change operation more efficiently during the production process.

[0038] The foregoing description of the disclosed embodiments enables those skilled in the art to implement 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 can be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended 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 plastic welder, comprising a machine frame, a hot module, an upper clamping module, a lower clamping module, a first driving platform, a second driving platform and a third driving platform; the first driving platform, the second driving platform and the third driving platform are respectively used to carry the hot module, the upper clamping module and the lower clamping module in a one-to-one correspondence, and all three take the machine frame as the installation and fixing foundation; after the hot module is translated to the working position under the traction force from the first driving platform, the upper clamping module and the lower clamping module occupying the working position perform displacement movements towards the hot module respectively under the traction forces from the second driving platform and the third driving platform, characterized in that, It also includes a mold changing auxiliary part; the mold changing auxiliary part is composed of an upper replacement mold auxiliary sub-part and a lower replacement mold auxiliary sub-part; under the action of the upper replacement mold auxiliary sub-part, the upper clamping module can be directionally coupled / detached relative to the thermal module; under the action of the lower replacement mold auxiliary sub-part, the lower clamping module can be directionally coupled / detached relative to the thermal module.

2. The hot plate plastic welder according to claim 1, characterized in that, The upper displacement mold auxiliary sub-section includes an upper first centering guide sleeve, an upper second centering guide sleeve and an upper centering guide column; the upper first centering guide sleeve and the upper second centering guide sleeve are respectively and one-to-one corresponding to the upper clamping module and the thermal module as the installation base; the lower displacement mold auxiliary sub-section includes a lower first centering guide sleeve, a lower second centering guide sleeve and a lower centering guide column; the lower first centering guide sleeve and the lower second centering guide sleeve are respectively and one-to-one corresponding to the lower clamping module, the thermal module as the installation base The thermal module is the installation base; and after the upper clamping module, the lower clamping module and the thermal module are pre-assembled and combined, with the help of the coordinated action of the upper centering guide column and the lower centering guide column, the upper first centering guide sleeve relative to the upper second centering guide sleeve, the lower first centering guide sleeve relative to the lower second centering guide sleeve, and the upper centering guide column relative to the lower centering guide column are all kept coaxial, and the upper clamping module and the lower clamping module are kept in a aligned state.

3. The hot plate plastic welder according to claim 2, wherein The number of the upper first centering guide sleeve, the upper second centering guide sleeve, the upper centering guide column, the lower first centering guide sleeve, the lower second centering guide sleeve and the lower centering guide column is consistent, all of which are N, and N≥2.

4. The hot plate plastic welder according to any one of claims 1-3, characterized in that, It also includes a plastic part alignment auxiliary part; the plastic part alignment auxiliary part includes a guide pin and a guide sleeve; the guide pin uses the upper clamping module as an installation base, and the guide sleeve matched with the guide pin uses the lower clamping module as an installation base; After the pre-welded plastic parts are heated, in the process of the upper clamping module performing displacement movement toward the lower clamping module, the guide pin gradually penetrates into the guide sleeve, and in this process, the alignment accuracy of the two pre-welded plastic parts is synchronously corrected.

5. A method for changing molds of a hot plate plastic welder, characterized in that, This is achieved by means of a hot plate plastic welding machine as described in any one of claims 2 to 4; The hot plate plastic welding machine mold changing method comprises the following steps: S1, the upper clamping module, the heating module, and the lower clamping module are pre-assembled as a whole and placed right in front of the hot plate plastic welding machine; S2, the first driving platform performs a forward translation movement to receive the thermal module, and locks the thermal module and the first driving platform into one; S3, the first driving platform performs a backward translation movement until the upper clamping module, the thermal module, and the lower clamping module occupy the working position; S4. The second driving platform performs a descending motion until it comes into contact with the upper clamping module, and locks the upper clamping module and the second driving platform together. At the same time, the third driving platform performs an ascending motion until it comes into contact with the lower clamping module, and locks the lower clamping module and the third driving platform together; S5. The second driving platform performs an ascending motion. The upper clamping module is separated from the thermal module due to the traction force from the second driving platform. During this process, the upper first centering guide sleeve gradually moves away from the upper second centering guide sleeve until the upper centering guide post loses its centering and guiding function. At the same time, the third driving platform performs a descending motion. The lower clamping module is separated from the thermal module due to the traction force from the third driving platform. During this process, the lower first centering guide sleeve gradually moves away from the lower second centering guide sleeve until the lower centering guide post loses its centering and guiding function.

6. The mold change method of the hot plate plastic welder according to claim 5, characterized in that In step S4, the displacement speed of the second driving platform is V1, and the displacement speed of the third driving platform is V2. In step S5, the displacement speed of the second driving platform is V3, and the displacement speed of the third driving platform is V4. Then V1 < V3 ≤ 0.8 m / min, V2 < V4 ≤ 0.8 m / min.

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