CN212075804U

CN212075804U - Winding device for textile fabric processing

Info

Publication number: CN212075804U
Application number: CN202020053634.4U
Authority: CN
Inventors: 蒋艳娜; 高铭梅; 刘福贤
Original assignee: Shandong Kechuang Clothing Co ltd
Current assignee: Shandong Kechuang Clothing Co ltd
Priority date: 2020-01-11
Filing date: 2020-01-11
Publication date: 2020-12-04
Anticipated expiration: 2030-01-11

Abstract

The utility model provides a take-up device is used in textile fabric processing, is including the base that has the landing leg, the support that compresses tightly of U type, lower pinch plate, go up the pinch plate, take-up device passes through support fixed mounting in one side of base top surface, fixed mounting backup pad respectively in front and at the back of base top surface opposite side, the top surface of backup pad installs the horizontal plate jointly, the below of horizontal plate is equipped with the roller frame of triangle-shaped structure, the roller frame comprises three same connecting rods I, connecting rod II, III end to end of connecting rod. The utility model discloses a mutually supporting between position control device, lower pressure strip and the last pressure strip can realize the change of clamp force between lower pressure strip and the last pressure strip to avoided the surface fabric too big or undersize's phenomenon of tension to appear when convoluteing, adjustment range is wide, and application scope is bigger.

Description

Winding device for textile fabric processing

Technical Field

The utility model belongs to the winding device field, specifically speaking are winding device is used in processing of textile fabric.

Background

In the production and processing process of surface fabric, the surface fabric finished product that the weaving was accomplished, need to convolute on the winding roller through take-up device, transport in order to carry out finished product surface fabric, carrying out the in-process that the surface fabric was convoluteed, because the coil stock is not timely, surface fabric tension is too big and the good multiple reason of equipment debugging, lead to the surface fabric fold to appear when convoluteing easily, loose phenomenon, the quality that the fold can influence the surface fabric appears in the surface fabric, cause the influence to later stage processing, the surface fabric is loose can the surface fabric scatter easily when the transport, the transportation of inconvenient surface fabric. Chinese that patent number is CN 201920326564.2 uses newly to disclose a coiling mechanism for textile fabric processing, and this patent is through leveling that the surface fabric can't be abundant flattening of carrying on of leveling roller, if the surface fabric just appears by the fold before leveling of leveling roller, leveling roller can't smooth the fold part this moment and eliminate the fold. The thickness of the fabric is different due to different yarns and processes used by different fabrics, and the clamping force of the clamping mechanism used in the patent cannot be adjusted, so that when a thicker fabric is clamped by the clamping mechanism, the clamping force is possibly too large, the fabric can cause an obstructing effect when being wound, the tension borne by the fabric between the clamping mechanism and the winding mechanism can be increased when being wound, and the fibers forming the fabric are easily broken due to the too large tension borne by the fabric, so that the quality of the fabric is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a coiling mechanism is used in textile fabric processing for solve the defect among the prior art.

The utility model discloses a following technical scheme realizes:

a winding device for processing textile fabrics comprises a base with supporting legs, a U-shaped pressing support, a lower pressing plate, an upper pressing plate and a winding device, wherein the winding device is fixedly arranged on one side of the top surface of the base through the support, supporting plates are fixedly arranged in front of and behind the other side of the top surface of the base respectively, a horizontal plate is jointly arranged on the top surface of each supporting plate, a roller frame with a triangular structure is arranged below each horizontal plate, the roller frame is composed of three same connecting rods I, II and III which are connected end to end, the roller frame is obliquely arranged, the connecting rods I and II are obliquely arranged, the connecting rods III are longitudinally arranged, cylindrical sleeves are sleeved on the peripheries of the connecting rods I, II and III, the connecting rods I, II and III are connected with the corresponding cylindrical sleeves through bearings, and the lower part of the back of the connecting rod I is fixedly connected with the front of the supporting plate on the, the preceding lower part of connecting rod II is through the back fixed connection of the backup pad of the same dead lever and front side, the one end of the same dead lever is installed jointly to the top surface upside of connecting rod I and connecting rod II, the other end of dead lever and the bottom surface fixed connection of horizontal plate, the top surface of base passes through the conveying support and rotates the installation transfer roller, the transfer roller is located between backup pad and the winding device, the top surface fixed mounting at transfer roller top compresses tightly the support, it is located between transfer roller and the winding device to compress tightly the support, the opening that compresses tightly the support is down, the top surface fixed mounting spring telescopic link of base, spring telescopic link is located the inside that compresses tightly the support, the pressure strip under the fixed installation of movable end of spring telescopic link, the top of lower pressure strip is equipped with the pressure strip, go up the pressure strip through position control device and compress tightly the leg joint, the top surface of lower pressure strip can.

The winding device for processing the textile fabric comprises a screw rod, a screw hole is formed in the center of the top surface of a pressing support, the screw rod is in threaded fit with the screw hole, a cylinder is fixedly installed on the top surface of an upper pressing plate, a blind hole is formed in the top surface of the cylinder, the lower end of the screw rod is connected with a blind hole bearing, vertical sliding grooves are formed in the front and the back of the inner wall of the pressing support respectively, sliding blocks are fixedly installed in the front and the back of the upper pressing plate respectively, and the sliding blocks are located in the corresponding sliding grooves respectively.

According to the winding device for processing the textile fabric, the handle is fixedly arranged at the upper end of the screw rod.

According to the winding device for processing the textile fabric, the anti-skid pad is fixedly arranged on the bottom surface of the supporting leg on the bottom surface of the base.

According to the winding device for processing the textile fabric, the plurality of elastic shifting pieces are fixedly arranged on the periphery of the cylindrical sleeve, the elastic shifting pieces are of arc structures, and the convex surfaces of the elastic shifting pieces can be in contact with the upper surface of the fabric.

According to the winding device for processing the textile fabric, the top surface of the lower compression plate and the bottom surface of the upper compression plate are polished, and two sides of the bottom surface of the upper compression plate are rounded.

The utility model has the advantages that: the utility model discloses get into the one end of surface fabric by the left side when using, the surface fabric passes between two backup pads, passes through by the roller frame below, walks around the top surface of driving roller, passes between by lower clamp plate and the last clamp plate again, then fixes in coiling roller periphery of coiling device, switches on the power of motor, and the output of motor passes through driving belt and drives the driving disc rotation, and the driving disc drives the coiling roller and rotates, makes the surface fabric coil in coiling roller periphery. The user can dial the surface fabric between the rolling belt device and lower pressure strip, the last pressure strip through the hand, judges the elasticity degree of surface fabric through the sense of touch to the tight degree of clamp of pressure strip and last pressure strip to the surface fabric under the judgement. If the pine then shows the clamp force undersize of clamp plate and last clamp plate to the surface fabric down, the position of going up the clamp plate is adjusted down through position adjusting device, it can press down the clamp plate and move down when going up the clamp plate and move down, the spring in the spring telescopic link is connected with lower clamp plate this moment is compressed, the spring compression volume in the spring telescopic link is big more, the spring telescopic link is big more to the ascending thrust of lower clamp plate, then clamp force between lower clamp plate and the last clamp plate just is big more, thereby make the surface fabric pressed down with the clamp plate clamp more tightly down, coiling mechanism is difficult to take the surface fabric out between lower clamp plate and last clamp plate, coiling mechanism just can make the surface fabric tighten up when carrying out the coiling of surface fabric again, it is loose when preventing the surface fabric from coiling. On the contrary, then will go up the position of pressure strip through position control device and adjust, when going up the pressure strip rebound, because pressure strip rebound under spring telescopic rod's the effort, the compression capacity of the spring in the spring telescopic rod can reduce with lower pressure strip connection spring telescopic rod this moment, the spring telescopic rod will diminish to the ascending thrust of pressure strip down, make the clamp force between pressure strip and the last pressure strip down diminish, thereby make the surface fabric by lower pressure strip and the more pine that the pressure strip pressed from both sides with last pressure strip, coiling mechanism takes out the surface fabric more easily between lower pressure strip and last pressure strip this moment, coiling mechanism just can make the tension of surface fabric reduce when carrying out the coiling of surface fabric again, prevent that surface fabric tension from too big causing the damage. Because the elasticity plectrum and the surface fabric contact of surface fabric at the periphery of transportation in-process cylindricality cover, there is certain frictional force between surface fabric and the elasticity plectrum, therefore the surface fabric can drive corresponding cylindricality cover through the elasticity plectrum and rotate when removing, connecting rod I, the cylindricality cover of II peripheries of connecting rod all rotates to the inboard of roll stand, the cylindricality cover of connecting rod I, II peripheries of connecting rod suit can imitate the effect that the operative employee smoothed the surface fabric to both sides with the hand this moment to avoid the surface fabric fold to appear. The utility model discloses a mutually supporting between cylindricality cover, roller frame, the plectrum can avoid the surface fabric fold to appear when convoluteing, and the reliability is higher, the effect is better. The utility model discloses a mutually supporting between position control device, lower pressure strip and the last pressure strip can realize the change of clamp force between lower pressure strip and the last pressure strip to avoided the surface fabric too big or undersize's phenomenon of tension to appear when convoluteing, adjustment range is wide, and application scope is bigger.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of the present invention; FIG. 2 is an enlarged view of the view from the direction A of FIG. 1; FIG. 3 is an enlarged view of section I of FIG. 1; FIG. 4 is an enlarged view of a cross-sectional view taken along line B-B of FIG. 2; fig. 5 is a partial enlarged view of ii of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

A winding device for textile fabric processing comprises a base 1 with supporting legs, a U-shaped pressing support 2, a lower pressing plate 3, an upper pressing plate 4, a winding device 5, wherein the winding device 5 comprises a winding support, a motor, a belt, a fixed disc, a movable disc, a transmission disc and a winding roller, the winding support is fixedly arranged on one side of the top surface of the base 1, the inner side of the winding support is rotatably connected with the winding roller, the two side edges of the winding roller are symmetrically provided with the fixed disc, the inner side of the fixed disc is fixedly welded with an extrusion spring at equal angles, the fixed disc is movably connected with the movable disc through the extrusion spring, the end of one side of the winding support is rotatably connected with the transmission disc, the transmission disc is in transmission connection with the motor through the transmission belt, the motor is connected with a power circuit, the winding device 5 is fixedly arranged on one side of the top surface of the base 1 through the support, the top surface of the supporting plate 6 is provided with a horizontal plate 7, a roller frame 8 with a triangular structure is arranged below the horizontal plate 7, the roller frame 8 is composed of three same connecting rods I8-1, II 8-2 and III 8-3 which are connected end to end, the roller frame 8 is obliquely arranged, the right side of the roller frame 8 is higher and the left side is lower, the connecting rod I8-1 and the connecting rod II 8-2 are obliquely arranged, the connecting rod III 8-3 is longitudinally arranged, the peripheries of the connecting rod I8-1, the connecting rod II 8-2 and the connecting rod III 8-3 are sleeved with cylindrical sleeves 9, the connecting rod I8-1, the connecting rod II 8-2 and the connecting rod III 8-3 are connected with the corresponding cylindrical sleeves 9 through bearings, the lower part of the rear surface of the connecting rod I8-1 is fixedly connected with the front surface of the supporting plate 6 at, the front lower part of the connecting rod II 8-2 is fixedly connected with the back of the supporting plate 6 at the front side through the same fixing rod 10, one end of the same fixing rod 10 is installed on the upper sides of the top surfaces of the connecting rod I8-1 and the connecting rod II 8-2 together, the other end of the fixing rod 10 is fixedly connected with the bottom surface of the horizontal plate 7, the top surface of the base 1 is rotatably provided with a conveying roller 11 through a conveying support, the conveying roller 11 is connected with a conveying support bearing, the conveying roller 11 is positioned between the supporting plate 6 and the winding device 5, the top of the conveying roller 11 is higher than the upper end of the connecting rod I8-1, the top surface of the base 1 is fixedly provided with a pressing support 2, the pressing support 2 is positioned between the conveying roller 11 and the winding device 5, the opening of the pressing support 2 faces downwards, the top surface of the base 1 is fixedly provided with a spring telescopic rod, the height of the top surface of the lower pressing plate 3 is always smaller than that of the top surface of the conveying roller 11, the upper pressing plate 4 is arranged above the lower pressing plate 3, the upper pressing plate 4 is connected with the pressing support 2 through a position adjusting device, and the top surface of the lower pressing plate 3 can be in contact fit with the bottom surface of the upper pressing plate 4. The utility model discloses get into surface fabric 20's one end by the left side when using, surface fabric 20 passes between two backup pads 6, by the process in roller frame 9 below, by the top surface of driving roller 11, pass between lower pinch plate 3 and the last pinch plate 4 again, then fix in the winding roller periphery of coiling device 5, the power of switch-on motor, the output of motor drives the driving disc through driving belt and rotates, the driving disc drives the winding roller and rotates, make the surface fabric convolute in the winding roller periphery. The user can be through dialling the surface fabric of making between winding device 5 and lower pressure strip 3, last pressure strip 4 by hand, judges the elasticity degree of surface fabric through the sense of touch to the tight degree of clamp of pressure strip 3 and last pressure strip 4 to the surface fabric under the judgement. If the tension is too loose, the clamping force of the lower compression plate 3 and the upper compression plate 4 to the fabric is too small, the position of the upper compression plate 4 is adjusted downwards through the position adjusting device, the lower compression plate 3 can be pressed to move downwards when the upper compression plate 4 moves downwards, at the moment, a spring in a spring telescopic rod 12 connected with the lower compression plate 3 is compressed, the larger the compression amount of the spring in the spring telescopic rod 12 is, the larger the upward thrust of the spring telescopic rod 12 to the lower compression plate 3 is, the larger the clamping force between the lower compression plate 3 and the upper compression plate 4 is, so that the fabric 20 is clamped more tightly by the lower compression plate 3 and the upper compression plate 4, the winding device 5 is not easy to draw out the fabric 20 between the lower compression plate 3 and the upper compression plate 4, the winding device 5 can tighten the fabric 20 when winding the fabric 20, and the fabric is prevented from being loose during winding. On the contrary, the position of the upper pressing plate 4 is adjusted upwards through the position adjusting device, when the upper pressing plate 4 moves upwards, the pressing plate 3 moves upwards under the acting force of the spring telescopic rod 12, the compression amount of a spring connected with the lower pressing plate 3 and inside the spring telescopic rod 12 is reduced, the upward thrust of the spring telescopic rod 12 to the lower pressing plate 3 is reduced, the clamping force between the lower pressing plate 3 and the upper pressing plate 4 is reduced, the fabric 20 is clamped between the lower pressing plate 3 and the upper pressing plate 4 more loosely, the winding device 5 can more easily draw the fabric 20 out between the lower pressing plate 3 and the upper pressing plate 4, the winding device 5 can reduce the tension of the fabric 20 when winding the fabric 20 is wound again, and damage caused by overlarge tension of the fabric is prevented. Because the elastic shifting sheet 19 at the periphery of the cylindrical sleeve 9 is in contact with the fabric 20 in the conveying process of the fabric 20, and a certain friction force exists between the fabric 20 and the elastic shifting sheet 19, the fabric 20 can drive the corresponding cylindrical sleeve 9 to rotate through the elastic shifting sheet 19 when moving, the cylindrical sleeves 9 at the peripheries of the connecting rod I8-1 and the connecting rod II 8-2 all rotate towards the inner side of the roller frame 8, and at the moment, the cylindrical sleeves 9 sleeved at the peripheries of the connecting rod I8-1 and the connecting rod II 8-2 can simulate the effect that an operator can smooth the fabric 20 towards two sides by hand, so that the fabric 20 is prevented from being wrinkled. The utility model discloses a mutually supporting between cylindricality cover 9, roller frame 8, the plectrum can avoid surface fabric 20 fold to appear when convoluteing, and the reliability is higher, the effect is better. The utility model discloses a mutually supporting between position control device, lower pressure strip 3 and the last pressure strip 4 can realize the change of clamp force between lower pressure strip 3 and the last pressure strip 4 to avoided surface fabric 20 to appear the phenomenon of too big or undersize of tension when convoluteing, the control range is wide, and application scope is bigger.

Specifically, as shown in fig. 1 and 5, the position adjusting device according to this embodiment includes a screw 13, a screw hole 14 is formed in the center of the top surface of the pressing bracket 2, the screw 13 is in threaded fit with the screw hole 14, a cylinder 15 is fixedly mounted on the top surface of the upper pressing plate 4, a blind hole 16 is formed in the top surface of the cylinder 15, the lower end of the screw 13 is in bearing connection with the blind hole 16, vertical sliding grooves 17 are respectively formed in the front and the rear of the inner wall of the pressing bracket 2, sliding blocks 18 are fixedly mounted in the front and the rear of the upper pressing plate 4, and the sliding blocks 18 are respectively located in the. The user can make screw rod 13 downward or upward movement through rotating screw rod 13, when screw rod 13 downstream, screw rod 13 drives cylinder 15, go up pressure strip 4 downstream, after last pressure strip 4 and lower pressure strip 3 contact, go up pressure strip 4's position more downstream go up pressure strip 4 promote down pressure strip 3 downstream, the spring in the spring telescopic link 12 is connected with lower pressure strip 3 this moment is compressed, the spring compression volume in the spring telescopic link 12 is big more, the spring telescopic link 12 is big more to the ascending thrust of lower pressure strip 3, then the clamp force between pressure strip 3 and the last pressure strip 4 is just big more down. On the contrary, the smaller the clamping force is, the smaller the clamping force between the lower pressing plate 3 and the upper pressing plate 4 can be conveniently adjusted by the structural design, so that the clamping effect of the lower pressing plate 3 and the upper pressing plate 4 on the fabric 20 can be conveniently adjusted by the user, and the phenomenon of over-looseness or over-tightness when the fabric 20 is clamped is prevented.

Specifically, as shown in fig. 1, a handle 21 is fixedly installed at the upper end of the screw 13 in the embodiment. This structural design can provide a point of application for the user to rotate screw 13, and the convenience of the user rotates screw 13.

Further, as shown in fig. 1, a non-slip mat is fixedly mounted on the bottom surface of the leg of the bottom surface of the base 1 according to the embodiment. This structural design can increase the frictional force between landing leg and the ground, increases the land fertility of grabbing of landing leg, makes the landing leg provide more stable support for base 1.

Furthermore, as shown in fig. 2, a plurality of elastic shifting pieces 19 are fixedly installed on the outer periphery of the cylindrical sleeve 9, the elastic shifting pieces 19 are of an arc-shaped structure, and the convex surfaces of the elastic shifting pieces 19 can contact with the upper surface of the fabric 20. Because the elastic shifting sheet 19 at the periphery of the cylindrical sleeve 9 is in contact with the fabric 20 in the conveying process of the fabric 20, and a certain friction force exists between the fabric 20 and the elastic shifting sheet 19, the fabric 20 can drive the corresponding cylindrical sleeve 9 to rotate through the elastic shifting sheet 19 when moving, the cylindrical sleeves 9 at the peripheries of the connecting rod I8-1 and the connecting rod II 8-2 all rotate towards the inner side of the roller frame 8, and at the moment, the cylindrical sleeves 9 sleeved at the peripheries of the connecting rod I8-1 and the connecting rod II 8-2 can simulate the effect that an operator can smooth the fabric 20 towards two sides by hand, so that the fabric 20 is prevented from being wrinkled. The cylindricality cover 9 of connecting rod III 8-3 periphery suit can prevent that surface fabric 20 from being located the roller frame 8 below when, because the inhomogeneous appearance that leads to the fold of atress improves the utility model discloses a reliability.

Further, as shown in fig. 1, the top surface of the lower pressure plate 3 and the bottom surface of the upper pressure plate 4 in this embodiment are polished, and both sides of the bottom surface of the upper pressure plate 4 are rounded. This structural design can prevent that surface fabric 20 from being by edges and corners or burr fish tail when transmitting between lower pressure strip 3 and last pressure strip 4, prevents to influence the quality of surface fabric 20.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a take-up device is used in textile fabric processing, is including base (1) that has the landing leg, and the support (2) that compresses tightly of U type go up pressure strip (4) down, and coiling device (5), coiling device (5) pass through support fixed mounting in one side of base (1) top surface, its characterized in that: the front and the back of the other side of the top surface of the base (1) are respectively and fixedly provided with a supporting plate (6), the top surface of the supporting plate (6) is provided with a horizontal plate (7) together, a roller frame (8) with a triangular structure is arranged below the horizontal plate (7), the roller frame (8) is composed of three same connecting rods I (8-1), II (8-2) and III (8-3) which are connected end to end, the roller frame (8) is obliquely arranged, the connecting rods I (8-1) and II (8-2) are obliquely arranged, the connecting rods III (8-3) are longitudinally arranged, the peripheries of the connecting rods I (8-1), II (8-2) and III (8-3) are sleeved with cylindrical sleeves (9), the connecting rods I (8-1), II (8-2) and III (8-3) are connected with the corresponding cylindrical sleeves (9) through bearings, the lower part of the back of the connecting rod I (8-1) is fixedly connected with the front of the supporting plate (6) at the back side through a fixing rod (10), the lower part of the front of the connecting rod II (8-2) is fixedly connected with the back of the supporting plate (6) at the front side through the same fixing rod (10), one end of the same fixing rod (10) is installed on the upper sides of the top surfaces of the connecting rod I (8-1) and the connecting rod II (8-2) together, the other end of the fixing rod (10) is fixedly connected with the bottom surface of the horizontal plate (7), the top surface of the base (1) is rotatably provided with a conveying roller (11) through a conveying bracket, the conveying roller (11) is positioned between the supporting plate (6) and the tape coiling device (5), the top of the conveying roller (11) is higher than the upper end of the connecting rod I (8-1), the top surface of the base (1) is fixedly provided with a pressing bracket, the opening that compresses tightly support (2) is down, the top surface fixed mounting spring telescopic link (12) of base (1), spring telescopic link (12) are located the inside that compresses tightly support (2), pressure strip (3) under the activity end fixed mounting of spring telescopic link (12), the top of pressure strip (3) is equipped with pressure strip (4) down, go up pressure strip (4) and be connected with pressure support (2) through position control device, the top surface of pressure strip (3) can be with the bottom surface contact cooperation of last pressure strip (4) down.

2. The winding device for textile fabric processing according to claim 1, characterized in that: the position adjusting device comprises a screw rod (13), a screw hole (14) is formed in the center of the top surface of a pressing support (2), the screw rod (13) is in threaded fit with the screw hole (14), a cylinder (15) is fixedly installed on the top surface of an upper pressing plate (4), a blind hole (16) is formed in the top surface of the cylinder (15), the lower end of the screw rod (13) is in bearing connection with the blind hole (16), vertical sliding grooves (17) are formed in the front and the back of the inner wall of the pressing support (2) respectively, sliding blocks (18) are fixedly installed in the front and the back of the upper pressing plate (4), and the sliding blocks (18) are located in the corresponding sliding grooves (17.

3. The winding device for textile fabric processing according to claim 2, characterized in that: the upper end of the screw rod (13) is fixedly provided with a handle (21).

4. The winding device for textile fabric processing according to claim 1, characterized in that: and the bottom surfaces of the supporting legs on the bottom surface of the base (1) are fixedly provided with anti-slip pads.

5. The winding device for textile fabric processing according to claim 1, characterized in that: the periphery of the cylindrical sleeve (9) is fixedly provided with a plurality of elastic shifting pieces (19), the elastic shifting pieces (19) are of arc-shaped structures, and convex surfaces of the elastic shifting pieces (19) can be in contact with the upper surface of the fabric (20).

6. The winding device for textile fabric processing according to claim 1, characterized in that: the top surface of the lower pressing plate (3) and the bottom surface of the upper pressing plate (4) are polished, and two sides of the bottom surface of the upper pressing plate (4) are rounded.