An injection molding device for producing a plastic part of an appliance base

Abstract

This invention discloses an injection molding device for producing plastic parts for home appliance bases, belonging to the field of injection mold technology. The device includes a lower fixed plate; both sides of the lower and upper fixed plates are equipped with lifting mechanisms for synchronously separating multi-layer injection mold templates. The lifting mechanisms contain a synchronization mechanism for simultaneously ejecting material from the multi-layer injection molds. By incorporating the lifting and synchronization mechanisms, this invention integrates multiple independent ejection mechanisms into a single drive system, achieving synchronized control of multi-layer ejection actions. Compared to traditional multi-layer mold multi-drive independent ejection schemes, this solution completely solves the defects of misaligned and asynchronous multi-layer ejection actions, effectively improving the overall stability of mold operation, reducing impact wear on mold components, minimizing downtime, ensuring continuous and stable production line operation, and extending the service life of the mold and supporting equipment.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, and specifically relates to an injection molding device for producing plastic parts for home appliance bases. Background Technology

[0002] In the home appliance manufacturing process, the molding quality and production efficiency of the plastic parts for appliance bases have a crucial impact on the overall quality and production capacity of the appliances. When producing these plastic parts, the injection molding machine uses injection molds. The mold system consists of a moving mold and a fixed mold. The mating surfaces of the moving and fixed molds are precision ground, resulting in extremely low surface roughness and ensuring a tight fit, effectively preventing material overflow. The mold has a complex network of cooling channels that circulate coolant to quickly and evenly cool and solidify the molded plastic parts, ensuring dimensional accuracy and structural stability. Furthermore, the mold's opening and closing actions are controlled by a servo drive mechanism. This mechanism precisely controls the opening and closing speed and position of the mold according to a preset program, ensuring extremely high repeatability and meeting the stringent dimensional accuracy requirements of the plastic parts for appliance bases.

[0003] In the injection molding process of home appliance base plastic parts, existing injection molding equipment often uses multi-layer injection molds to meet complex structures and molding requirements. However, in multi-layer injection molds, each layer needs to be equipped with an independent ejector assembly, and each ejector assembly uses an independent drive method, including independent hydraulic drive or independent servo drive. This independent drive mode results in the inability to completely eliminate mechanical transmission backlash, hydraulic system pressure response time difference, and servo system command response time difference. Consequently, there is a significant asynchrony in the ejection timing, ejection force, and ejection displacement of the plastic parts in each layer. During demolding, some base parts... Plastic parts are subjected to pushing forces in some areas, while the forces in other areas are delayed, resulting in localized stretching and a surge in internal stress. The thin walls and reinforcing ribs of the appliance base require extremely high stress balance. Uneven stress can easily lead to defects such as warping of the plastic parts, breakage of clips, and cracking of the base, directly causing a significant increase in the defect rate of appliance bases and additional rework and scrap costs. At the same time, the problem of plastic parts broken due to demolding failure requires frequent machine shutdowns to clean the broken plastic parts, which seriously interrupts the continuous injection molding cycle. This not only reduces production efficiency, but also causes fluctuations in production parameters due to machine shutdowns and restarts, further affecting the stability of product quality.

[0004] Therefore, there is an urgent need to provide an injection molding device for the production of plastic parts for home appliance bases to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an injection molding device for the production of plastic parts for home appliance bases.

[0006] The technical solution adopted to solve the above technical problems is: an injection molding device for producing plastic parts for home appliance bases, including a lower fixing plate, a positioning guide post fixed to the top of the lower fixing plate, and an upper fixing plate fixed to the top of the positioning guide post. An electric telescopic rod is fixed to the top of the upper fixed plate, and several female templates are slidably sleeved on the outside of the positioning guide post, and several male templates are slidably sleeved on the outside of the positioning guide post. The bottom end of the electric telescopic rod piston rod is fixedly connected to the top end of the female template, and the female template and male template are sealed and fitted together after being closed. The external part of the public template is provided with an ejection mechanism to realize synchronous control of multi-layer ejection action. Both sides of the lower fixed plate and the upper fixed plate are provided with a lifting mechanism to synchronously separate the multi-layer injection mold template. The internal part of the lifting mechanism is provided with a synchronous mechanism to simultaneously eject the multi-layer injection mold.

[0007] Through the above technical solution, this injection molding device achieves layered stacking of the female and male mold plates by using positioning guide pillars, enabling multiple sets of mold plates to be stacked and arranged in layers. Multiple appliance base plastic parts can be molded in a single injection, significantly increasing the output per unit time. At the same time, during the mold closing injection stage, the electric telescopic rod drives the female mold plate downward along the positioning guide pillars, so that the female mold plate and the male mold plate are tightly sealed and fitted, improving the sealing performance of the mold cavity, effectively preventing the leakage of molten plastic raw materials from the parting surface, and ensuring the stability of injection molding.

[0008] Furthermore, the top material mechanism includes a limiting slide fixed to the bottom end of the male template, a lifting top plate slidably installed on the outside of the limiting slide, and a lifting pin fixed at the top end of the lifting top plate, which extends through and into the interior of the male template.

[0009] Through the above technical solution, the limiting slide is fixed to the male template at the top and to the female template at the bottom, forming a stable support frame. This provides a reliable guide and limiting foundation for the sliding of the lifting top plate. When it is necessary to eject the molded product, the lifting top plate is driven to rise and fall smoothly along the limiting slide. The sliding motion of the lifting top plate is converted into the extension and retraction motion of the lifting ejector pin, so that the top of the lifting ejector pin extends precisely out of the molding cavity of the male template, applies ejection force to the molded product in the cavity, and successfully ejects the product to complete the demolding operation. After the ejection is completed, the lifting top plate is driven to slide in the opposite direction, causing the lifting ejector pin to retract into the male template, reserving space for the next molding operation.

[0010] Furthermore, a cylindrical spring is sleeved on the outside of the lifting pin, and the two ends of the cylindrical spring are respectively attached to the bottom end of the male template and the top end of the lifting plate. A drive slide plate is fixed on both sides of the lifting plate.

[0011] With the above technical solution, after injection molding is completed, the drive slide moves the lifting top plate upward, the lifting ejector pin extends into the male mold plate to eject the injection molded product, and after the product is ejected, the drive slide moves the lifting top plate downward. At the same time, the cylindrical spring pushes the lifting top plate to reset, causing the lifting ejector pin to retract into the male mold plate, waiting for the next injection molding and ejection operation.

[0012] Furthermore, the lifting mechanism includes two fixed plate guide rails fixed to one side of the lower fixed plate and the upper fixed plate, and two mounting sliders are slidably installed on the outside of each of the two fixed plate guide rails. Two double-sided guide rails are fixed to one side of each of the four mounting sliders.

[0013] Through the above technical solution, two double-sided guide rails slide on the fixed plate guide rail by installing sliders, providing power transmission for simultaneous material removal of multi-layer injection molds.

[0014] Furthermore, each of the several mother templates is fixed with a mounting rotating rod on one side, and a synchronous folding rod is rotatably mounted on the outside of each of the mounting rotating rods, with the starting position of each of the synchronous folding rods being a short synchronous rod.

[0015] With the above technical solution, when it is necessary to lift or lower the multi-layer template, one of the mother templates is driven to lift or lower. The mother template is equipped with a rotating rod that drives the synchronous folding rod to move accordingly. The synchronous folding rod folds or unfolds according to the lifting or lowering direction of the mother template. The movement of the synchronous folding rod transmits power to other mother templates, causing them to lift or lower synchronously, thereby realizing the linkage lifting and lowering of all mother templates and ensuring the consistency of the separation action of the multi-layer template.

[0016] Furthermore, a connecting rod is rotatably mounted between several of the synchronous folding rods, and a rotating rod slider is fixed at one end of the connecting rod. The outside of the rotating rod slider is slidably connected to the inside of the double-sided guide rail.

[0017] With the above technical solution, when the synchronous folding rod is folded and unfolded, the folding action of the synchronous folding rod drives the connecting rotating rod to move accordingly. The connecting rotating rod drives the rotating rod slider to slide in the double-sided guide rail, and at the same time, the double-sided guide rail moves adaptively with the action.

[0018] Furthermore, the synchronization mechanism includes a template guide rail fixed to one side of the template, and two template sliders are slidably mounted on the outside of the template guide rail. A guide rail slider is fixed to one side of each template slider, and a fixing rotating rod is fixed to the other side of each template slider.

[0019] With the above technical solution, when the male template is raised or lowered, the male template moves up and down along the template guide rail, and the template slider moves up and down along the guide rail slider and the fixed rotating rod.

[0020] Furthermore, the outer side of the guide rail slider is slidably connected to the inner side of the double-sided guide rail, and the outer side of the fixed rotating rod is adaptively slidably connected to the inner wall of the drive slide plate.

[0021] With the above technical solution, when the two double-sided guide rails clamp and move, the two double-sided guide rails drive the two guide rail sliders to move accordingly, and the two guide rail sliders drive the two fixed rotating rods to move accordingly. Due to the adaptive sliding cooperation between the fixed rotating rods and the drive slide plate, the drive slide plate drives the lifting top plate to rise and fall accordingly.

[0022] The beneficial effects of this invention are as follows: (1) This invention integrates multiple independent ejector mechanisms into a single drive system by providing a lifting mechanism and a synchronization mechanism. This unified drive enables synchronous control of multi-layer ejector actions. Compared with the traditional multi-layer mold multi-drive independent ejector scheme, this scheme can completely solve the defects of misalignment and asynchronous ejector actions, effectively improve the overall stability of mold operation, reduce impact wear of various mold components, reduce downtime failures, ensure continuous and stable operation of the production line, and extend the service life of mold and supporting equipment. At the same time, by eliminating multiple independent ejector drive units, the total number of mold components is greatly reduced, the overall mechanical structure of the mold is simplified, the difficulty of on-site assembly, debugging and subsequent maintenance is reduced, and the purchase, replacement and maintenance expenses of multiple independent ejector accessories are reduced. From the perspective of equipment operation and maintenance, this significantly reduces the long-term production and operation costs of enterprises.

[0023] (2) By providing an ejector mechanism and a synchronization mechanism, the present invention can simultaneously separate the female mold plate and the male mold plate of the multi-layer injection mold, avoid mold core collision and product tearing defects caused by the deviation of the mold plate opening and closing sequence, greatly shorten the production cycle, improve production efficiency, reduce manual intervention, reduce production costs, and can flexibly adjust the number of female mold plate and male mold plate according to the product thickness to meet the production needs of different specifications of products.

[0024] (3) By providing an ejector mechanism and a lifting mechanism, the present invention can simultaneously eject the plastic parts of the appliance base of the multi-layer injection mold, ensuring that the ejection force and ejection stroke of each layer of plastic parts are consistent, improving the demolding consistency of plastic parts, avoiding deformation and damage of products due to uneven ejection, significantly improving the product molding quality and reducing the scrap rate. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the production state of the multi-layer injection mold of the present invention; Figure 2 This is a structural diagram of the multi-layer injection mold in the material removal state according to the present invention; Figure 3 yes Figure 1 Exploded structure diagram; Figure 4 This is a schematic diagram of the female template and male template structure of the present invention; Figure 5 This is an exploded structural diagram of the top material mechanism of the present invention; Figure 6 This is a schematic diagram of the top-feeding mechanism of the present invention; Figure 7 This is a schematic diagram of the lifting mechanism structure of the present invention; Figure 8 This is a schematic diagram of the synchronization mechanism structure of the present invention.

[0026] Reference numerals: 1. Lower fixed plate; 2. Positioning guide post; 3. Upper fixed plate; 4. Electric telescopic rod; 5. Female template; 6. Male template; 7. Top material mechanism; 701. Limiting slide; 702. Lifting top plate; 703. Lifting pin; 704. Columnar spring; 705. Drive slide plate; 8. Lifting mechanism; 801. Fixed plate guide rail; 802. Mounting slider; 803. Double-sided guide rail; 804. Mounting rotating rod; 805. Synchronous folding rod; 806. Connecting rotating rod; 807. Rotating rod slider; 9. Synchronization mechanism; 901. Template guide rail; 902. Template slider; 903. Guide rail slider; 904. Fixed rotating rod. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] like Figures 1-8 As shown, this embodiment of an injection molding device for producing plastic parts for home appliance bases includes a lower fixed plate 1, a positioning guide post 2 fixed to the top of the lower fixed plate 1, and an upper fixed plate 3 fixed to the top of the positioning guide post 2. An electric telescopic rod 4 is fixed to the top of the upper fixed plate 3. A plurality of female templates 5 are slidably sleeved on the outside of the positioning guide post 2, and a plurality of male templates 6 are slidably sleeved on the outside of the positioning guide post 2. The bottom end of the piston rod of the electric telescopic rod 4 is fixedly connected to the top end of the female template 5. After the female templates 5 and male templates 6 are closed, they are sealed and fitted together. This injection molding device realizes the layered stacking of female templates 5 and male templates 6 through the positioning guide post 2, realizing the layered stacking arrangement of multiple sets of templates. Multiple plastic parts for home appliance bases can be molded in a single injection, which greatly increases the output per unit time. At the same time, during the mold closing injection stage, the electric telescopic rod 4 drives the female template 5 downward along the positioning guide post 2, so that the female template 5 and male template 6 are tightly sealed and fitted together, improving the sealing performance of the mold cavity, effectively preventing the leakage of molten plastic raw materials from the parting surface, and ensuring the stability of injection molding.

[0029] like Figures 4-6As shown, the external part of the male template 6 is equipped with an ejector mechanism 7 for synchronous control of multi-layer ejection actions. The ejector mechanism 7 includes a limiting slide 701 fixed to the bottom end of the male template 6. A lifting plate 702 is slidably installed on the external part of the limiting slide 701. A lifting pin 703 with one end penetrating and extending into the interior of the male template 6 is fixed to the top of the lifting plate 702. A cylindrical spring 704 is sleeved on the external part of the lifting pin 703. The two ends of the cylindrical spring 704 are respectively attached to the bottom end of the male template 6 and the top end of the lifting plate 702. Drive slide plates 705 are fixed on both sides of the lifting plate 702. The limiting slide 701 is fixed to the male template 6 at the top end and to the female template 5 at the bottom end, forming a stable support frame, providing a reliable guide and limiting basis for the sliding of the lifting plate 702. When ejection of the molded product is required, the lifting plate 702 is driven. 2. The lifting plate 702 moves smoothly up and down along the limiting slide 701. The sliding motion of the lifting plate 702 is converted into the extension and retraction motion of the lifting pin 703, so that the top of the lifting pin 703 extends precisely out of the molding cavity of the male mold plate 6, applies the ejection force to the molded product in the cavity, and smoothly ejects the product to complete the demolding operation. After the ejection is completed, the lifting plate 702 is driven to slide in the opposite direction, which drives the lifting pin 703 to retract into the male mold plate 6, reserving space for the next molding operation. After the injection is completed, the driving slide plate 705 drives the lifting plate 702 to move upward, and the lifting pin 703 extends into the male mold plate 6 to eject the injection molded product. After the product is ejected, the driving slide plate 705 drives the lifting plate 702 to move downward. At the same time, the column spring 704 pushes the lifting plate 702 to reset, which drives the lifting pin 703 to retract into the male mold plate 6, waiting for the next injection and ejection operation.

[0030] like Figure 3 and Figure 7As shown, both sides of the lower fixed plate 1 and the upper fixed plate 3 are provided with lifting mechanisms 8 for synchronously separating multi-layer injection mold templates. The lifting mechanism 8 includes two fixed plate guide rails 801 fixed to one side of the lower fixed plate 1 and the upper fixed plate 3. Two mounting sliders 802 are slidably installed on the outside of the two fixed plate guide rails 801. Two double-sided guide rails 803 are fixed on one side of the four mounting sliders 802. Several female templates 5 are fixed to one side of each mounting rod 804. Synchronous folding rods 805 are rotatably installed on the outside of each mounting rod 804. The starting position of the synchronous folding rods 805 is a short synchronous rod. Connecting rods 806 are rotatably installed between the synchronous folding rods 805. A rotating rod slider is fixed to one end of the connecting rod 806. 807, the external of the rotating rod slider 807 is slidably connected to the internal of the double-sided guide rail 803. The two double-sided guide rails 803 slide on the fixed plate guide rail 801 through the mounting slider 802, providing power transmission for the simultaneous stripping of multi-layer injection molds. When it is necessary to lift the multi-layer template, one of the mother templates 5 is driven to lift. The mother template 5 drives the synchronous folding rod 805 to move accordingly through the mounting rotating rod 804. The synchronous folding rod 805 folds or unfolds according to the lifting direction of the mother template 5. The movement of the synchronous folding rod 805 transmits power to other mother templates 5, driving other mother templates 5 to lift synchronously, thereby realizing the linkage lifting of all mother templates 5 and ensuring the consistency of the multi-layer template separation action.

[0031] like Figure 3 and Figure 8 As shown, the lifting mechanism 8 has a synchronous mechanism 9 inside for simultaneous unloading of multi-layer injection molds. The synchronous mechanism 9 includes a template guide rail 901 fixed to one side of the male template 6. Two template sliders 902 are slidably mounted on the outside of the template guide rail 901. A guide rail slider 903 is fixed to one side of each template slider 902, and a fixed rotating rod 904 is fixed to the other side of each template slider 902. The outside of the guide rail slider 903 is slidably connected to the inside of the double-sided guide rail 803, and the outside of the fixed rotating rod 904 is adaptively slidably connected to the inner wall of the drive slide plate 705. When the synchronous folding... When rod 805 is folded and unfolded, it will drive the connecting rotating rod 806 to move. The connecting rotating rod 806 will drive the rotating rod slider 807 to slide within the double-sided guide rail 803. At the same time, the double-sided guide rail 803 will move accordingly. When the two double-sided guide rails 803 clamp and move, the two double-sided guide rails 803 will drive the two guide rail sliders 903 to move accordingly. The two guide rail sliders 903 will drive the two fixed rotating rods 904 to move accordingly. Due to the adaptive sliding cooperation between the fixed rotating rods 904 and the drive slide plate 705, the drive slide plate 705 will drive the lifting top plate 702 to rise and fall accordingly.

[0032] The working principle of this embodiment is as follows: the electric telescopic rod 4 is started, and the electric telescopic rod 4 drives the female template 5 to slide down along the positioning guide post 2 to achieve precise stacking of multiple templates. The female template 5 and the male template 6 are sealed and fitted together to form a closed molding cavity. The injection molding machine injects the injection molding material into the molding cavity for injection molding. Since the female template 5 and the male template 6 are sealed and fitted together after the mold is closed, the leakage of raw materials is effectively prevented, and the injection molding process is ensured to proceed stably.

[0033] After injection molding is completed, the electric telescopic rod 4 is activated, driving the mother template 5 to slide upward along the positioning guide post 2. The rise of the mother template 5 drives the installation rotating rod 804 to move, and the installation rotating rod 804 drives the synchronous folding rod 805 to unfold. The unfolding of the synchronous folding rod 805 drives the other mother templates 5 to rise synchronously, realizing the synchronous separation of multiple templates.

[0034] When the mother template 5 is raised or lowered, since the mother template 5 is fixedly connected to the limiting slide 701 of another template, the mother template 5 will drive the male template 6 of the other template to rise or fall accordingly. The male template 6 drives the template slider 902 to rise or fall accordingly through the template guide rail 901. The template slider 902 drives the guide rail slider 903 and the fixed rotating rod 904 to rise or fall accordingly, thereby counteracting the rise and fall of the mother template 5 and the drive slide 705.

[0035] When the synchronous folding rod 805 unfolds, it drives the connecting rotating rod 806 to move. The connecting rotating rod 806 drives the rotating rod slider 807 to slide within the double-sided guide rail 803, and simultaneously drives the double-sided guide rail 803 to slide along the fixed plate guide rail 801. When the double-sided guide rail 803 slides, it drives the guide rail slider 903 to move. The guide rail slider 903 drives the fixed rotating rod 904 to move. The fixed rotating rod 904, through adaptive sliding cooperation with the drive slide plate 705, drives the drive slide plate 705 to rise. The drive slide plate 705 drives the lifting top plate 702 to rise along the limiting slide 701. The lifting top plate 702 drives the lifting ejector pin 703 to extend, applying a lifting force to the molded product to achieve synchronous ejection and unloading.

[0036] After the ejection is completed, the electric telescopic rod 4 drives the mother template 5 to reset downwards, and the synchronous folding rod 805 folds accordingly, causing each component to move in the opposite direction. The lifting ejector pin 703 automatically returns to its original position under the reset force of the cylindrical spring 704, preparing for the next ejection operation. The entire device returns to its initial state and can proceed to the next round of injection molding production.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. An injection molding device for producing a plastic part of an appliance base, comprising a lower fixed plate (1), characterized in that: The top end of the lower fixed plate (1) is fixed with a positioning guide column (2), and the top end of the positioning guide column (2) is fixed with an upper fixed plate (3); The top end of the upper fixed plate (3) is fixed with an electric telescopic rod (4), the outside of the positioning guide column (2) is slidably sleeved with a plurality of female mold plates (5), and the outside of the positioning guide column (2) is slidably sleeved with a plurality of male mold plates (6); The bottom end of the electric telescopic rod (4) piston rod is fixedly connected with the top end of the female mold plate (5), and the female mold plate (5) and the male mold plate (6) are sealed and fitted after being combined. The outside of the male mold plate (6) is provided with a stripping mechanism (7) for realizing synchronous control of multi-layer stripping action, and the two sides of the lower fixed plate (1) and the upper fixed plate (3) are provided with a lifting mechanism (8) for synchronously separating the multi-layer injection mold plate, and the inside of the lifting mechanism (8) is provided with a synchronous mechanism (9) for simultaneously stripping the multi-layer injection mold.

2. The injection molding device for producing a plastic home appliance base according to claim 1, wherein, The stripping mechanism (7) comprises a limiting sliding frame (701) fixed to the bottom end of the male mold plate (6), the outside of the limiting sliding frame (701) is slidably installed with a lifting top plate (702), and the top end of the lifting top plate (702) is fixed with a lifting ejector pin (703) penetrating through one end and extending into the inside of the male mold plate (6).

3. The injection molding device for producing a plastic home appliance base according to claim 2, wherein, The outside of the lifting ejector pin (703) is sleeved with a cylindrical spring (704), the two ends of the cylindrical spring (704) are respectively matched with the bottom end of the male mold plate (6) and the top end of the lifting top plate (702), and the two sides of the lifting top plate (702) are fixed with a driving sliding plate (705).

4. The injection molding device for producing a plastic home appliance base according to claim 1, wherein, The lifting mechanism (8) comprises two fixed plate guide rails (801) fixed to one side of the lower fixed plate (1) and the upper fixed plate (3), two installation sliding blocks (802) are slidably installed on the outside of the two fixed plate guide rails (801), and two double-sided guide rails (803) are fixed on one side of the four installation sliding blocks (802).

5. The injection molding device for producing a plastic home appliance base according to claim 4, wherein, One side of each of the plurality of female mold plates (5) is fixed with an installation rotating rod (804), the outside of each of the plurality of installation rotating rods (804) is rotatably installed with a synchronous folding rod (805), and the initial position of each of the plurality of synchronous folding rods (805) is a short synchronous rod.

6. The injection molding device for producing a plastic home appliance base according to claim 5, wherein, A connecting rotating rod (806) is rotatably installed between the plurality of synchronous folding rods (805), one end of the connecting rotating rod (806) is fixed with a rotating rod sliding block (807), and the outside of the rotating rod sliding block (807) is slidably connected with the inside of the double-sided guide rail (803).

7. The injection molding device for producing a plastic home appliance base according to claim 3, wherein, The synchronous mechanism (9) comprises a mold plate guide rail (901) fixed to one side of the male mold plate (6), two mold plate sliding blocks (902) are slidably installed on the outside of the mold plate guide rail (901), a guide rail sliding block (903) is fixed on one side of each of the two mold plate sliding blocks (902), and a fixed rotating rod (904) is fixed on the other side of each of the two mold plate sliding blocks (902).

8. The injection molding device for producing a plastic home appliance base according to claim 7, wherein, The outside of the guide rail sliding block (903) is slidably connected with the inside of the double-sided guide rail (803), and the outside of the fixed rotating rod (904) is adaptively and slidably connected with the inner wall of the driving sliding plate (705).

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