CN215549294U - Pressure maintaining mold and pressure maintaining device - Google Patents

Abstract

The application discloses pressurize mould and pressurizer. When the fixing component is used, the semi-finished silica gel product is placed on the fixing component, and the part, corresponding to the finished silica gel product, of the semi-finished silica gel product is fixed on the convex part. Then the waste discharge plate is placed on the upper side of the semi-finished product of the silica gel product, the through hole of the waste discharge plate is placed corresponding to the convex part, and the die-cutting product is placed on the upper side of the waste discharge plate. And finally, driving the pressure maintaining plate to move towards the waste discharge plate, so that the pressure maintaining plate pushes the waste discharge plate to slide along the convex part, and in the moving process, firstly, the pressure maintaining plate is matched with the convex part, and the pressure maintaining plate is used for cutting the die-cut product. Then, the waste discharge plate is matched with the convex part, and the waste discharge plate punches the semi-finished product of the silica gel product to ensure that the waste material part of the semi-finished product of the silica gel product falls off. And finally, extruding and press-fitting the pressure maintaining plate and the convex part, so that the cut die-cut product is attached to the semi-finished product of the silica gel product, and maintaining the pressure to obtain a finished product. The pressure maintaining mold can simultaneously realize waste discharge, film pasting and pressure maintaining of silica gel products, and improves the production efficiency.

Description

Pressure maintaining mold and pressure maintaining device

Technical Field

The application relates to the technical field of production of silica gel products, in particular to a pressure maintaining mold and a pressure maintaining device.

Background

In the related art, after the silica gel product is molded in the mold, a semi-finished product is formed in which the product and the waste are connected together. Aiming at the semi-finished product of the silica gel product, firstly, the semi-finished product of the silica gel product needs to be manually discharged by personnel; then, sticking the die-cut product to the waste-discharged semi-finished product of the silica gel product; and finally, putting the semi-finished product of the silica gel product adhered with the die-cut product into a jig, pressing the jig by hands for pressure maintaining, and then taking out the jig to obtain a finished product.

The technology needs manual waste discharge, manual film pasting and manual pressure maintaining, the labor cost is high, and production stations need to be converted for many times midway, so that the production efficiency is low.

Disclosure of Invention

The present application is directed to solving at least one of the problems in the prior art. For this, this application provides a pressurize mould, can realize the three process of the waste discharge of silica gel product semi-manufactured goods, pad pasting and pressurize through this pressurize mould, has realized automated production, has saved the cost of labor to production efficiency has been improved.

The application still provides a pressurizer who has above-mentioned pressurize mould.

According to the pressurize mould of the first aspect embodiment of this application, the pressurize mould includes fixed subassembly, row's useless board, pressurize board.

The fixing component comprises a base and at least one convex part, the convex part is arranged on one side of the base, and the convex part is used for fixing the semi-finished product of the silica gel product;

the waste discharge plate is positioned on one side of the base provided with the convex part, at least one through hole is arranged on the waste discharge plate, the through hole and the convex part are arranged correspondingly, the waste discharge plate is in sliding fit with the convex part through the through hole, and the waste discharge plate is used for blanking the semi-finished product of the silica gel product;

the pressure maintaining plate is positioned on one side of the waste discharge plate, which is far away from the base, and the pressure maintaining plate can push the waste discharge plate to slide along the convex part; the pressure maintaining plate is provided with a concave part, and the concave part and the convex part are arranged correspondingly.

According to the pressure maintaining mould of the embodiment of the application, at least the following beneficial effects are achieved: when the pressure maintaining mold is used, a semi-finished silica gel product is placed on the fixing component, and the part, corresponding to a finished product, of the semi-finished silica gel product is fixed on the convex part. Then, the waste discharge plate is placed on the upper side of the semi-finished product of the silica gel product, the through holes of the waste discharge plate are placed corresponding to the convex parts, and the die-cutting product is placed on the upper side of the waste discharge plate. And finally, the pressure maintaining plate moves towards the waste discharge plate, so that the pressure maintaining plate pushes the waste discharge plate to slide along the convex part, and in the moving process, firstly, the pressure maintaining plate is matched with the convex part, and the pressure maintaining plate is used for cutting the die-cut product. Then, the waste discharge plate is matched with the convex part, and the waste discharge plate punches the semi-finished product of the silica gel product to ensure that the waste material part of the semi-finished product of the silica gel product falls off. And finally, extruding and press-fitting the pressure maintaining plate and the convex part, so that the cut die-cut product is attached to the semi-finished product of the silica gel product, and maintaining the pressure to obtain a finished product. The pressure maintaining mold can simultaneously realize waste discharge, film pasting and pressure maintaining of silica gel products, realizes automatic production, saves labor cost and improves production efficiency.

According to some embodiments of the present application, the pressure-maintaining mold further comprises a lower template and an upper template;

the lower template is arranged on the lower side of the fixing component;

the upper template is located above the lower template, the upper template is connected with the lower template through a second guide column, the upper template is in sliding fit with the second guide column, and the pressure maintaining plate is fixed on the lower side of the upper template.

According to some embodiments of the application, the lower bolster is equipped with the recess, the opening of recess is towards keep the board, the base is fixed in the recess.

According to some embodiments of the application, convex part one end connect in the base, the other end is equipped with the boss, the boss is used for the location and fixes the semi-manufactured goods of silica gel product.

According to some embodiments of the application, the base is provided with at least one first guide post, the discard plate is provided with at least one guide hole, and the first guide post is in sliding fit with the guide hole.

According to some embodiments of the application, the inner wall of concave part towards the central point of concave part puts and is equipped with the arch, the arch can with the side of silica gel product semi-manufactured goods contacts.

According to a second aspect of the present application, an embodiment of the pressure holding device includes the above pressure holding mold.

According to the pressure maintaining device of the embodiment of the second aspect of the application, at least the following beneficial effects are achieved: including above-mentioned pressurize mould's whole beneficial effect, no longer repeated description here.

According to some embodiments of the application, the pressure holding device further comprises a driving assembly for driving the pressure holding plate to move toward the discard plate.

According to some embodiments of the present application, the pressure holding device further comprises a frame, and the pressure holding mold and the driving component are respectively disposed on the frame.

According to some embodiments of the present application, the frame includes a die holder, a fixing post, and a fixing seat.

The pressure maintaining die is arranged on the upper side of the die holder;

the fixing column is longitudinally fixed on the die holder;

the fixing seat is sleeved on the fixing column, the fixing seat is in sliding fit with the fixing column, and the driving assembly is arranged on the fixing seat.

According to some embodiments of the application, the drive assembly includes a cylinder and a push rod, the cylinder is in driving connection with the pressure maintaining plate through the push rod.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic view of a pressure holding device according to an embodiment of a second aspect of the present application, including a pressure holding mold according to an embodiment of the first aspect;

FIG. 2 is a schematic view of a securing assembly according to an embodiment of the first aspect of the present application;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is a schematic view of a discard plate according to an embodiment of the first aspect of the present application;

FIG. 5 is a schematic view of a pressure retention plate according to an embodiment of the first aspect of the present application;

FIG. 6 is an enlarged view at B in FIG. 5;

FIG. 7 is a schematic view of a lower platen of an embodiment of the first aspect of the present application;

fig. 8 is a schematic view of a semi-finished silica gel product according to an embodiment of the first aspect of the present application.

Reference numerals:

the fixing assembly 100, the base 110, the first guide post 120, the convex portion 130, and the boss 131;

the waste discharge plate 200, a through hole 201, a guide hole 202 and a grabbing part 210;

pressure retention plate 300, recess 310, protrusion 311;

a driving assembly 400, a cylinder 410, a push rod 420;

a control device 500;

the die holder 610, the backing plate 620, the fastener 621, the fixing plate 630, the lower die plate 640, the second guide column 650, the upper die plate 660, the groove 670, the fixing column 680 and the fixing seat 690;

an active portion 710, a waste portion 720.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

According to the pressure maintaining mold of the embodiment of the first aspect of the present application, the pressure maintaining mold includes a fixing member 100, a discard plate 200, and a pressure maintaining plate 300.

The fixing assembly 100 comprises a base 110 and at least one convex part 130, wherein the convex part 130 is arranged on one side of the base 110, and the convex part 130 is used for fixing the semi-finished product of the silica gel product;

the waste discharge plate 200 is positioned on one side of the base 110 provided with the convex part 130, at least one through hole 201 is arranged on the waste discharge plate 200, the through hole 201 is arranged corresponding to the convex part 130, the waste discharge plate 200 is in sliding fit with the convex part 130 through the through hole 201, and the waste discharge plate 200 is used for blanking a semi-finished product of a silica gel product;

the pressure maintaining plate 300 is positioned on one side of the waste discharging plate 200 far away from the base 110, and the pressure maintaining plate 300 can push the waste discharging plate 200 to slide along the convex part 130; the pressure maintaining plate 300 is provided with a concave part 310, the concave part 310 and the convex part 130 are correspondingly arranged, and the pressure maintaining plate 300 is matched with the convex part 130 through the concave part 310, so that the pressure maintaining plate 300 maintains the pressure of the semi-finished product of the silica gel product.

As shown in fig. 1 to 6, the plurality of protrusions 130 are provided on the upper side of the base 110. The waste discharge plate 200 is located on the upper side of the base 110, a plurality of through holes 201 are arranged on the waste discharge plate 200, the number of the through holes 201 is matched with that of the convex portions 130, and the convex portions 130 can be matched with the corresponding through holes 201, so that the waste discharge plate 200 can slide along the convex portions 130. In order to facilitate the waste discharge plate 200 to be placed on the fixing member 100 or to be removed from the fixing member 100, the side of the waste discharge plate 200 is provided with a catching portion 210. The pressure maintaining plate 300 is located above the waste discharging plate 200, a plurality of concave portions 310 are arranged on the lower side of the pressure maintaining plate 300, the number of the concave portions 310 is matched with the number of the convex portions 130, the concave portions 310 can be matched with the corresponding convex portions 130, the pressure maintaining plate 300 can slide along the convex portions 130, and the concave portions 310 can be matched with the convex portions 130, so that the pressure maintaining plate 300 can maintain pressure on the semi-finished product of the silica gel product.

As shown in fig. 8, the semi-finished product of the silicone product includes an effective portion 710 and a waste portion 720, the effective portion 710 is a portion of the semi-finished product of the silicone product corresponding to the final finished product, the waste portion 720 is an unnecessary portion of the finished product, and bottom ends of the effective portion 710 are connected by the waste portion 720.

The use process of the pressure maintaining mold is as follows: the semi-finished silicone product is placed on the fixing member 100, that is, the effective part 710 of the semi-finished silicone product is placed on the protrusion 130. Then, the waste discharge plate 200 is placed on the upper side of the semi-finished product of the silica gel product, the through hole 201 of the waste discharge plate 200 is placed corresponding to the convex portion 130, namely the effective portion 710 penetrates through the through hole 201 of the waste discharge plate 200, the bottom of the effective portion 710 is connected through the waste portion 720, the waste discharge plate 200 is placed on the waste portion 720, meanwhile, the die-cut product is placed on the upper side of the waste discharge plate 200, and in order to avoid the die-cut product from contacting the semi-finished product of the silica gel product in advance, the depth of the through hole 201 is larger than the height of the effective portion 710.

Finally, the pressure maintaining plate 300 moves towards the waste discharging plate 200, so that the pressure maintaining plate 300 pushes the waste discharging plate 200 to slide along the convex portion 130, in the moving process, firstly, the pressure maintaining plate 300 is in contact with the upper side of the waste discharging plate 200, in the downward moving process of the pressure maintaining plate 300, the convex portion 130 is inserted into the concave portion 310, and the pressure maintaining plate 300 is matched with the convex portion 130, so that the pressure maintaining plate 300 cuts die-cut products. Meanwhile, in the process that the waste discharge plate 200 moves downwards, the waste discharge plate 200 is matched with the convex part 130, so that the waste discharge plate 200 punches the semi-finished product of the silica gel product, and the waste material part 720 of the semi-finished product of the silica gel product falls off. Finally, the innermost side of the concave part 310 of the pressure maintaining plate 300 is in contact with the upper end of the semi-finished product of the silica gel product, and the pressure maintaining plate 300 is matched with the convex part 130, so that the cut die-cut product is attached to the effective part 710 of the semi-finished product of the silica gel product, and pressure maintaining is carried out, and a finished product is obtained.

The pressure maintaining mold can simultaneously realize waste discharge, film pasting and pressure maintaining of silica gel products, realizes automatic production, saves labor cost and improves production efficiency.

According to some embodiments of the present application, the pressure-maintaining mold further comprises a lower template 640 and an upper template 660;

the lower template 640 is arranged at the lower side of the fixing component 100;

the cope match-plate pattern 660 is located the top of lower bolster 640, connects through second guide post 650 between cope match-plate pattern 660 and the lower bolster 640, and cope match-plate pattern 660 and second guide post 650 are sliding fit mutually, and pressurize board 300 is fixed in the downside of cope match-plate pattern 660.

As shown in fig. 1, the upper plate 660, the pressure maintaining plate 300, the waste discharging plate 200, the fixing assembly 100, and the lower plate 640 are sequentially disposed from top to bottom.

The pressure maintaining plate 300 is fixed on the lower side of the upper mold plate 660 through a plurality of connecting columns, and the base 110 of the fixing assembly 100 is fixed on the lower mold plate 640, so that the concave part 310 of the pressure maintaining plate 300 is arranged opposite to the convex part 130 on the base 110. And a second guide column 650 is arranged between the upper template 660 and the lower template 640, one end of the second guide column 650 is fixed on the lower template 640, the other end of the second guide column extends upwards and penetrates through the upper template 660, and the upper template 660 can slide along the second guide column 650. Specifically, the second guide pillar 650 penetrates the holding pressure plate 300, and the holding pressure plate 300 can slide along the second guide pillar 650, thereby further improving the stability of the holding pressure mold during operation.

According to some embodiments of the present application, the lower mold plate 640 is provided with a groove 670, the opening of the groove 670 faces the pressure maintaining plate 300, and the base 110 is fixed in the groove 670.

As shown in fig. 7, the lower mold plate 640 has a groove 670 formed on the upper side thereof, and the shape of the groove 670 matches with that of the base 110, and the base 110 is fixed in the groove 670, which facilitates the assembly and disassembly of the fixing assembly 100.

According to some embodiments of the present application, one end of the protrusion 130 is connected to the base 110, and the other end is provided with a boss 131, and the boss 131 is used for positioning and fixing the semi-finished silicone product.

As shown in fig. 1 to 3, one end of the convex portion 130 is fixed on the base 110, the other end of the convex portion 130 is provided with a boss 131, the shape of the boss 131 corresponds to the shape of the effective portion 710 of the semi-finished product of the silica gel product, the boss 131 can contact with the inner wall of the effective portion 710 to limit the sliding of the effective portion 710 in the horizontal direction, so that the convex portion 130 can better position the effective portion 710, and the semi-finished product of the silica gel product is prevented from sliding in the blanking process to affect the yield of the finished product.

According to some embodiments of the present application, the base 110 is provided with at least one first guide post 120, the waste disposal plate 200 is provided with at least one guide hole 202, and the first guide post 120 is slidably engaged with the guide hole 202.

As shown in fig. 2 to 4, a plurality of first guide posts 120 are disposed on the base 110 near the side, a plurality of guide holes 202 are disposed on the waste discharge plate 200 near the side, and the first guide posts 120 are in sliding fit with the corresponding guide holes 202, so that the waste discharge plate 200 is more stable in the process of punching the semi-finished product of the silica gel product, and the precision of the formed finished product is higher. Specifically, the height of the first guide post 120 is higher than that of the protrusion 130, so that when the waste discharge plate 200 is initially installed, a pre-positioning function can be performed on the waste discharge plate 200, the through hole 201 of the waste discharge plate 200 can be aligned with the protrusion 130, and the precision of a finished product can be improved.

According to some embodiments of the present application, the inner wall of the concave portion 310 is provided with a protrusion 311 towards the center of the concave portion 310, and the protrusion 311 can contact with the side surface of the semi-finished silicone product.

As shown in fig. 5 to 6, a plurality of protrusions 311 are disposed on the inner wall of the concave portion 310 toward the center of the concave portion 310, the protrusions 311 are circumferentially arranged along the center of the concave portion 310, and in the process that the pressure plate 300 moves downward to make the die-cut product fit to the semi-finished product of the silicone product, the protrusions 311 can contact with the side surfaces of the effective portion 710, so that the die-cut product can better fit to the side surfaces of the effective portion 710, and the quality of the finished product is improved.

According to the pressure holding device of an embodiment of the second aspect of the present application, the pressure holding device includes the above pressure holding mold.

According to the pressure maintaining device of the embodiment of the second aspect of the application, at least the following beneficial effects are achieved: including above-mentioned pressurize mould's whole beneficial effect, no longer repeated description here.

According to some embodiments of the present application, the pressure maintaining device further comprises a driving assembly 400, the driving assembly 400 being configured to drive the pressure maintaining plate 300 to move toward the discard plate 200.

As shown in fig. 1, the driving assembly 400 includes an air cylinder 410 and a push rod 420, the air cylinder 410 is located above the pressure maintaining plate 300, a piston rod of the air cylinder 410 faces downward, i.e., faces the pressure maintaining plate 300, one end of the push rod 420 is connected to the piston rod of the air cylinder 410, and the other end drives the pressure maintaining plate 300 to move up and down.

According to some embodiments of the present application, the pressure maintaining device further includes a frame, and the pressure maintaining mold and the driving assembly 400 are respectively disposed on the frame.

According to some embodiments of the present application, the rack includes a die holder 610, a fixing post 680, and a fixing base 690. The pressure maintaining mold is arranged on the upper side of the mold base 610; the fixing column 680 is longitudinally fixed on the die holder 610; the fixing base 690 is sleeved on the fixing post 680, the fixing base 690 is in sliding fit with the fixing post 680, and the driving assembly 400 is arranged on the fixing base 690.

As shown in fig. 1, the fixing post 680 and the fixing base 690, one end of the fixing post 680 is disposed on the die holder 610, the other end of the fixing post 680 extends upward, the fixing base 690 is sleeved on the fixing post 680, the fixing base 690 can slide along the fixing post 680, the fixing base 690 is located above the upper die plate 660, the fixing assembly 100 is disposed on the upper side of the fixing base 690, and the position of the fixing assembly 100 can be adjusted by the cooperation of the fixing base 690 and the fixing post 680. Specifically, the cylinder 410 is disposed on the upper side of the fixing base 690, and the push rod 420 passes through the fixing base 690 from the lower side of the cylinder 410 to connect the upper side of the upper mold plate 660.

As shown in fig. 1, the pressure maintaining device further includes a backing plate 620, a fixing plate 630, and a control device 500; the backing plate 620 is arranged on the upper side of the die holder 610; the fixing plate 630 is arranged on the upper side of the backing plate 620, and the lower template 640 is arranged on the fixing plate 630; the control device 500 is electrically connected to the driving assembly 400.

As shown in fig. 1, the upper template 660, the pressure maintaining plate 300, the waste discharging plate 200, the fixing assembly 100, the lower template 640, the fixing plate 630, the base plate 620 and the die holder 610 are sequentially arranged from top to bottom.

The pad 620 is disposed between the fixing plate 630 and the die holder 610 for buffering.

The driving assembly 400 and the control device 500 are mounted on the fixing base 690, so that the driving assembly 400 is located above the upper mold plate 660, the push rod 420 of the driving assembly 400 is connected to the upper side of the upper mold plate 660 in a driving manner, and the driving assembly 400 can enable the upper mold plate 660 to move along the axial direction of the push rod 420, so that the pressure-maintaining plate 300 is controlled to be matched with the waste discharge plate 200 and the convex portion 130. The control device 500 is located at one side of the driving assembly 400, and the control device 500 is used for controlling the driving assembly 400, thereby controlling the motion state of the pressure maintaining plate 300, so that the pressure maintaining plate 300 moves downward, upward, or immovable.

The fixing plate 630 is disposed between the backing plate 620 and the lower mold plate 640, and the fixing plate 630 is connected to the backing plate 620 and the lower mold plate 640 respectively. The fixing plate 630 comprises two fixing plates which are symmetrically fixed on the lower side of the lower die plate 640 and close to the side face of the lower die plate 640, a side groove is formed in one side of each fixing plate 630, an opening corresponding to the side groove is formed in the backing plate 620, the backing plate 620 and the fixing plate 630 are detachably connected through a fastener 621, the fastener 621 penetrates through the side groove and the opening, and the lower die plate 640 can be conveniently mounted and dismounted.

Claims (10)

1. Pressurize mould, its characterized in that includes:

the fixing component comprises a base and at least one convex part, the convex part is arranged on one side of the base, and the convex part is used for fixing the semi-finished product of the silica gel product;

the waste discharge plate is positioned on one side of the base provided with the convex part, at least one through hole is formed in the waste discharge plate, the through hole and the convex part are arranged correspondingly, the waste discharge plate is in sliding fit with the convex part through the through hole, and the waste discharge plate is used for blanking the semi-finished product of the silica gel product;

the pressure maintaining plate is positioned on one side of the waste discharge plate, which is far away from the base, and can push the waste discharge plate to slide along the convex part; the pressure maintaining plate is provided with a concave part, and the concave part and the convex part are arranged correspondingly.

2. The holding pressure mold according to claim 1, characterized by further comprising:

the lower template is arranged on the lower side of the fixing component;

the upper template is positioned above the lower template, the upper template is connected with the lower template through a second guide column, the upper template is in sliding fit with the second guide column, and the pressure maintaining plate is fixed on the lower side of the upper template.

3. The holding pressure die of claim 2, wherein the lower die plate is provided with a groove, the opening of the groove faces the holding pressure plate, and the base is fixed in the groove.

4. The pressure maintaining mold as claimed in claim 1, wherein one end of the protrusion is connected to the base, and the other end of the protrusion is provided with a boss for positioning and fixing the semi-finished silicone product.

5. The holding pressure die of claim 1, wherein the base is provided with at least one first guide post, the discard plate is provided with at least one guide hole, and the first guide post is slidably fitted with the guide hole.

6. The pressure maintaining mold according to claim 1, wherein a protrusion is provided on an inner wall of the concave portion toward a center of the concave portion, and the protrusion is capable of contacting with a side surface of the semi-finished silicone product.

7. Pressurizer, its characterized in that includes:

the holding pressure mold according to any one of claims 1 to 6.

8. The dwell device according to claim 7, further comprising a drive assembly for driving the movement of the dwell plate towards the reject plate.

9. The pressurizer of claim 8, further comprising a frame, wherein the pressure holding mold and the driving assembly are respectively disposed on the frame.

10. The pressurizer of claim 9, wherein the frame comprises:

the pressure maintaining die is arranged on the upper side of the die holder;

the fixing column is longitudinally fixed on the die holder;

the fixing seat is sleeved on the fixing column, the fixing seat is in sliding fit with the fixing column, and the driving assembly is arranged on the fixing seat.

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