Plastic sheet press forming positioning jig

Abstract

The utility model relates to sheet material forming processing technical field discloses plastic sheet pressing forming positioning fixture, including machine body, the middle part fixed connection of the top wall of machine body has clamping mechanism, the clamping mechanism is used for clamping fixed, the outer wall rear side fixed connection of machine body has blanking mechanism, the blanking mechanism is used for promoting blanking, the clamping mechanism includes hollow runner long board, the middle part fixed connection of the top wall of machine body has hollow runner long board, the inner wall equidistance sliding connection of hollow runner long board has a plurality of L shaped boards, the outer wall adjacent side of L shaped board all equidistance fixed connection has a plurality of spring piece, the bottom fixed connection of hollow runner long board has drive assembly, in the utility model, through control servo motor positive and negative rotation, can drive rack drive L shaped board and approach each other or away from each other, and adjusting does not need to rely on fixed positioning hole, can accurate adjustment interval according to sheet material actual size.

Description

Technical Field

[0001] This utility model relates to the field of sheet forming and processing technology, and in particular to a positioning fixture for plastic sheet compression forming. Background Technology

[0002] Plastic sheets refer to sheet-like plastic products made primarily from plastics (high molecular polymers) through extrusion, calendering, casting, and blow molding processes. They are important intermediate or end products in the plastics processing industry. Plastic sheet compression molding positioning fixtures are specialized tooling equipment used for precise positioning, fixing, and posture constraint of plastic sheets during the compression molding process. Their core function is to ensure that the plastic sheet maintains its preset position and shape during hot pressing, cold pressing, and other pressing processes, avoiding displacement, wrinkles, or misalignment, and ultimately ensuring the dimensional accuracy, shape consistency, and appearance quality of the molded product.

[0003] Existing clamps use negative pressure to hold the sheet firmly in place through suction holes, preventing it from shifting or wrinkling during pressing. However, for plastic sheets with pre-drilled holes, the negative pressure leaks out through the holes, failing to create effective suction and causing the sheet to shift. Current technology uses positioning pins that engage with positioning holes. When changing to different sheet sizes, simply removing the positioning pin allows for adjustment. However, the fit between the positioning pin and the positioning hole depends on pre-set hole positions. The positioning holes on the clamping table must be pre-drilled according to fixed specifications, only suitable for standard-sized sheets corresponding to the hole positions. It cannot adaptively adjust and clamp non-standard sheet sizes. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a plastic sheet compression molding positioning fixture, which aims to improve the problem that the positioning holes on the fixture table in the prior art need to be opened in advance according to fixed specifications, and can only adapt to standard size sheets corresponding to the hole positions, and cannot adaptively adjust and clamp non-standard size sheets at all.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a plastic sheet pressing and positioning fixture, comprising a machine body, a clamping mechanism fixedly connected to the middle of the top wall of the machine body for clamping and fixing, and a feeding mechanism fixedly connected to the rear side of the outer wall of the machine body for pushing and feeding; the clamping mechanism includes a hollow slide rail plate, the hollow slide rail plate being fixedly connected to the middle of the top wall of the machine body, a plurality of L-shaped plates being equidistantly slidably connected to the inner wall of the hollow slide rail plate, a plurality of spring plates being equidistantly fixedly connected to adjacent sides of the outer wall of the L-shaped plates, and a driving assembly being fixedly connected to the bottom of the hollow slide rail plate.

[0006] As a further description of the above technical solution:

[0007] The drive assembly includes a servo motor, which is fixedly connected to the bottom of the hollow slide rail plate. A rotating gear is fixedly connected to the output end of the servo motor. Multiple U-shaped hollow plates are fixedly connected at equal intervals to the bottom of the hollow slide rail plate. A rack is slidably connected to the inner wall of each U-shaped hollow plate. An L-shaped support plate is fixedly connected to the bottom of the hollow slide rail plate.

[0008] As a further description of the above technical solution:

[0009] The feeding mechanism includes an inclined feeding plate, which is fixedly connected to the rear side of the outer wall of the machine body. Multiple rollers are equidistantly rotatably connected to the outer wall of the inclined feeding plate. An electric push rod is fixedly connected to the top front side of the machine body. A force relief component is slidably connected to the lower middle part of the inner wall of the inclined feeding plate.

[0010] As a further description of the above technical solution:

[0011] The pressure relief assembly includes a sliding plate, which is slidably connected to the lower part of the inner wall of the inclined feeding plate. Pressure relief springs are fixedly connected to the left and right rear ends of the lower part of the inner wall of the inclined feeding plate. Piston cylinders are fixedly connected to the left and right sides of the front end of the outer wall of the sliding plate. Exhaust grooves are opened on the outer wall of the piston cylinders. Piston rods are fixedly connected to the left and right sides of the front end of the inner wall of the inclined feeding plate.

[0012] As a further description of the above technical solution:

[0013] The exhaust groove is circular in shape, and the front end of the pressure relief spring is fixedly connected to the rear side of the outer wall of the sliding plate.

[0014] As a further description of the above technical solution:

[0015] The exhaust groove is circular in shape, and the front end of the pressure relief spring is fixedly connected to the rear side of the outer wall of the sliding plate.

[0016] As a further description of the above technical solution:

[0017] The rotating gear meshes with the rack, and the bottom of the servo motor is fixedly connected to the top of the L-shaped support plate.

[0018] As a further description of the above technical solution:

[0019] A hydraulic rod is fixedly connected to the top of the machine body, and a pressure plate is fixedly connected to the bottom end of the hydraulic rod.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, after the servo motor is started, it drives the rotating gear to rotate. Because the rotating gear meshes with the rack, the rotational force is converted into the linear motion of the rack. The rack is slidably connected to the inner wall of the U-shaped hollow plate and slides synchronously with the L-shaped plate, thereby driving the L-shaped plate to slide along the inner wall of the hollow slide groove. By controlling the forward and reverse rotation of the servo motor, the rack can be driven to move the L-shaped plates closer or further apart. The adjustment does not rely on fixed positioning holes and the spacing can be accurately adjusted according to the actual size of the sheet.

[0022] 2. In this utility model, when the sheet slides down to the lower part of the inclined feeding plate, it contacts and pushes the sliding plate sliding on the inner wall to move backward, compressing the relief spring at the rear end of the inner wall. The elastic deformation of the spring absorbs part of the kinetic energy to decelerate. At the same time, the piston cylinder at the front end of the sliding plate moves backward synchronously, so that the piston rod at the front end of the feeding plate gradually inserts into the piston cylinder. The air in the cylinder is slowly discharged through the exhaust groove, forming air pressure damping to further slow down the speed and avoid the spring rebound causing secondary impact. After the kinetic energy of the sheet is exhausted, the relief spring releases potential energy to push the sliding plate to reset, the piston cylinder resets with it, the piston rod is pulled out, and the air re-enters the cylinder through the exhaust groove. The sheet is discharged from the bottom end of the feeding plate under the action of gravity and buffered inertia, completing the feeding. Attached Figure Description

[0023] Figure 1 This is a front view of the plastic sheet pressing and positioning fixture proposed in this utility model;

[0024] Figure 2 This is a perspective view of the plastic sheet pressing and positioning fixture proposed in this utility model;

[0025] Figure 3 This is a partial structural schematic diagram of the plastic sheet pressing and positioning fixture proposed in this utility model;

[0026] Figure 4 This is a partial structural exploded view of the plastic sheet pressing and positioning fixture proposed in this utility model;

[0027] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0028] Legend:

[0029] 1. Machine body; 2. Clamping mechanism; 201. Hollow slide rail long plate; 202. L-shaped plate; 203. Spring plate; 204. Drive assembly; 2041. Servo motor; 2042. Rotating gear; 2043. L-shaped support plate; 2044. Rack; 2045. U-shaped hollow plate; 3. Unloading mechanism; 301. Inclined unloading plate; 302. Roller; 303. Electric push rod; 304. Force relief assembly; 3041. Sliding plate; 3042. Exhaust groove; 3043. Piston cylinder; 3044. Piston rod; 3045. Force relief spring; 4. Pressure plate; 5. Hydraulic rod. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment of a plastic sheet compression molding positioning fixture, comprising a machine body 1. A clamping mechanism 2 is fixedly connected to the middle of the top wall of the machine body 1 for clamping and fixing. A feeding mechanism 3 is fixedly connected to the rear side of the outer wall of the machine body 1 for pushing and feeding. The clamping mechanism 2 includes a hollow slide rail 201, which is fixedly connected to the middle of the top wall of the machine body 1. Multiple L-shaped plates 202 are equidistantly slidably connected to the inner wall of the hollow slide rail 201. Multiple spring plates 203 are equidistantly fixedly connected to adjacent sides of the outer wall of the L-shaped plates 202. A driving assembly 204 is fixedly connected to the bottom of the hollow slide rail 201. The driving assembly 204 includes a servo motor 2041, which is fixedly connected to the bottom of the hollow slide rail 201. The output end of the servo motor 2041 is fixedly connected to a rotating gear 2042. Multiple U-shaped hollow plates 2045 are fixedly connected at equal intervals to the bottom of the hollow slide plate 201. The inner walls of the U-shaped hollow plates 2045 are slidably connected to racks 2044. The bottom of the hollow slide plate 201 is fixedly connected to an L-shaped support plate 2043. The bottom of the L-shaped plate 202 is fixedly connected to the top of the racks 2044. The outer wall of the L-shaped plate 202 is slidably connected to the inner wall of the U-shaped hollow plate 2045. The model of the servo motor 2041 is Y80l-2. The basic components of the servo motor 2041 are: frame, core, winding, end cover, and bearing. The general working principle is to use electricity to generate a magnetic field, and then convert electrical energy into mechanical energy through the interaction between magnetic fields or the force of the magnetic field on the current.

[0032] Specifically, the servo motor 2041 is started, and its output drives the rotating gear 2042 to rotate. Since the rotating gear 2042 is meshed with the rack 2044, the rotational force of the rotating gear 2042 is converted into the linear motion of the rack 2044. The rack 2044 slides synchronously with the L-shaped plate 202. The rack 2044 is slidably connected to the inner wall of the U-shaped hollow plate 2045. When the rack 2044 slides along the inner wall of the U-shaped hollow plate 2045, it will drive the L-shaped plate 202, which is fixed at the top, to slide synchronously along the inner wall of the hollow slide groove long plate 201. By controlling the forward and reverse rotation of the servo motor 2041, the rack 2044 can be driven to move the L-shaped plates 202 closer or further apart. The adjustment process does not rely on fixed positioning holes and can be adjusted according to the actual size of the sheet. Whether it is a standard size or a non-standard size, the spacing between adjacent L-shaped plates 202 can be precisely adjusted. When the spacing between the L-shaped plates 202 is adjusted to match the width or length of the sheet, the spring plate 203 plays an adaptive clamping role to ensure stable fixation without damaging the sheet, further improving the adaptability to non-standard sheet specifications.

[0033] Reference Figure 2 , Figure 4 and Figure 5 The feeding mechanism 3 includes an inclined feeding plate 301, which is fixedly connected to the rear side of the outer wall of the machine body 1. Multiple rollers 302 are equidistantly rotatably connected to the outer wall of the inclined feeding plate 301. An electric push rod 303 is fixedly connected to the front top of the machine body 1. A pressure relief assembly 304 is slidably connected to the lower middle part of the inner wall of the inclined feeding plate 301. The pressure relief assembly 304 includes a sliding plate 3041, which is slidably connected to the lower middle part of the inner wall of the inclined feeding plate 301. Pressure relief springs 3045 are fixedly connected to the rear ends of the lower left and right sides of the lower middle part of the inner wall of the inclined feeding plate 301. Piston cylinders 3045 are fixedly connected to the left and right sides of the front end of the outer wall of the sliding plate 3041. 43. The outer wall of the piston cylinder 3043 is provided with exhaust grooves 3042. The left and right sides of the front end of the inner wall of the inclined feeding plate 301 are fixedly connected to the piston rod 3044. The exhaust grooves 3042 are circular in shape. The front end of the pressure relief spring 3045 is fixedly connected to the rear side of the outer wall of the sliding plate 3041. The electric push rod 303 is model LX835. The electric push rod 303 is mainly composed of a drive motor, a reduction gear, a screw, a nut, a push rod, a guide sleeve, and a control device. Its working principle is that the drive motor drives the reduction gear to rotate, the gear drives the screw to rotate, and the nut meshing with the screw drives the push rod to make linear reciprocating motion along the guide sleeve to realize the push-pull action.

[0034] Specifically, the servo motor 2041 is started, and its output drives the rotating gear 2042 to rotate. Since the rotating gear 2042 is meshed with the rack 2044, the rotational force of the rotating gear 2042 is converted into the linear motion of the rack 2044. The rack 2044 slides synchronously with the L-shaped plate 202. The rack 2044 is slidably connected to the inner wall of the U-shaped hollow plate 2045. When the rack 2044 slides along the inner wall of the U-shaped hollow plate 2045, it will drive the L-shaped plate 202, which is fixed at the top, to slide synchronously along the inner wall of the hollow slide groove long plate 201. By controlling the forward and reverse rotation of the servo motor 2041, the rack 2044 can be driven to move the L-shaped plates 202 closer or further apart. The adjustment process does not rely on fixed positioning holes and can be adjusted according to the actual size of the sheet. Whether it is a standard size or a non-standard size, the spacing between adjacent L-shaped plates 202 can be precisely adjusted. When the spacing between the L-shaped plates 202 is adjusted to match the width or length of the sheet, the spring plate 203 plays an adaptive clamping role to ensure stable fixation without damaging the sheet, further improving the adaptability to non-standard sheet specifications.

[0035] Reference Figure 1 , Figure 2 and Figure 3 The exhaust groove 3042 is circular in shape. The front end of the pressure relief spring 3045 is fixedly connected to the rear side of the outer wall of the sliding plate 3041. The top of the machine body 1 is fixedly connected to the hydraulic rod 5, and the bottom end of the hydraulic rod 5 is fixedly connected to the pressure plate 4. The model of the hydraulic rod 5 is: DYTZW1000-500 / 110-X. The general structure and working principle are as follows: it consists of a cylinder, a piston, and a piston rod 3044. After the hydraulic oil enters the cylinder, it pushes the piston and drives the piston rod 3044 to extend or retract, directly outputting thrust or pull force.

[0036] Specifically, the exhaust groove 3042 is circular, which, together with the piston cylinder 3043 and the piston rod 3044, forms a pneumatic damping. When the piston rod 3044 is inserted into the piston cylinder 3043, the air inside the cylinder is slowly discharged through the circular exhaust groove 3042. The air discharge resistance is used to prevent the sliding plate 3041 from sliding, thus achieving slow speed. During operation, the hydraulic rod 5 is hydraulically driven to achieve extension and retraction. The pressure plate 4 at its bottom end moves up and down synchronously with the extension and retraction of the hydraulic rod 5. According to actual needs, the extension and retraction of the hydraulic rod 5 can control the pressure plate 4 to apply pressure to the target object or release pressure to complete the corresponding pressing operation.

[0037] Working principle: The servo motor 2041 is started, and its output drives the rotating gear 2042 to rotate. Since the rotating gear 2042 is meshed with the rack 2044, the rotational force of the rotating gear 2042 is converted into linear motion of the rack 2044. The rack 2044 slides synchronously with the L-shaped plate 202. The rack 2044 is slidably connected to the inner wall of the U-shaped hollow plate 2045. When the rack 2044 slides along the inner wall of the U-shaped hollow plate 2045, it drives the top-fixed L-shaped plate 202 to slide synchronously along the inner wall of the hollow slide groove long plate 201. The servo motor 2041 can be controlled to rotate forward and backward, driving the rack 2044 to move the L-shaped plates 202 closer or further apart. The adjustment process does not rely on fixed positioning holes and can be adjusted according to the actual size of the sheet. Whether it is a standard size or a non-standard size, the spacing between adjacent L-shaped plates 202 can be precisely adjusted. When the spacing between the L-shaped plates 202 is adjusted to match the width or length of the sheet, the spring plate 203 plays an adaptive clamping role, ensuring stable fixation without damaging the sheet, further improving the adaptability to non-standard sheet specifications.

[0038] When the sheet slides down to the lower part of the inclined feeding plate 301, it contacts the front end of the sliding plate 3041, which is slidably connected to the lower part of the inner wall of the inclined feeding plate 301. This pushes the sliding plate 3041 to slide backward along the inner wall of the inclined feeding plate 301. As the sliding plate 3041 slides backward, it compresses the pressure relief springs 3045 fixed on the left and right sides of the rear end of the inner wall of the inclined feeding plate 301. The elastic deformation of the pressure relief springs 3045 absorbs part of the kinetic energy of the sheet sliding down, slowing down the sheet's movement speed. At the same time as the sliding plate 3041 slides backward, the piston cylinders 3043 fixed on the left and right sides of its front end move backward synchronously, causing the piston rods 3044 fixed on the left and right sides of the front end of the inner wall of the inclined feeding plate 301 to gradually insert into the piston cylinders 3043. When the piston rod 3044 is inserted, the air inside the piston cylinder 3043 is slowly discharged through the circular exhaust groove 3042 on the outer wall, forming a pressure damping effect, which further hinders the sliding speed of the sliding plate 3041 and avoids secondary impact caused by the spring rebound of the sheet. After the kinetic energy of the sheet is completely absorbed, the stress relief spring 3045 releases elastic potential energy, pushing the sliding plate 3041 to reset forward. At the same time, the piston cylinder 3043 resets with the sliding plate 3041, and the piston rod 3044 is pulled out from the piston cylinder 3043. The air re-enters the piston cylinder 3043 through the exhaust groove 3042. The sheet is discharged from the bottom end of the inclined feeding plate 301 under the action of gravity and the inertia after buffering, completing the entire feeding process.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plastic sheet compression molding positioning fixture, comprising a machine body (1), characterized in that: A clamping mechanism (2) is fixedly connected to the middle of the top wall of the machine body (1). The clamping mechanism (2) is used for clamping and fixing. A feeding mechanism (3) is fixedly connected to the rear side of the outer wall of the machine body (1). The feeding mechanism (3) is used for pushing and feeding. The clamping mechanism (2) includes a hollow slide plate (201), which is fixedly connected to the middle of the top wall of the machine body (1). Multiple L-shaped plates (202) are equidistantly slidably connected to the inner wall of the hollow slide plate (201). Multiple spring plates (203) are equidistantly fixedly connected to adjacent sides of the outer wall of the L-shaped plates (202). A drive assembly (204) is fixedly connected to the bottom of the hollow slide plate (201).

2. The plastic sheet pressing and positioning fixture according to claim 1, characterized in that: The drive assembly (204) includes a servo motor (2041), which is fixedly connected to the bottom of the hollow slide plate (201). A rotating gear (2042) is fixedly connected to the output end of the servo motor (2041). Multiple U-shaped hollow plates (2045) are fixedly connected at equal intervals to the bottom of the hollow slide plate (201). A rack (2044) is slidably connected to the inner wall of each U-shaped hollow plate (2045). An L-shaped support plate (2043) is fixedly connected to the bottom of the hollow slide plate (201).

3. The plastic sheet pressing and positioning fixture according to claim 1, characterized in that: The feeding mechanism (3) includes an inclined feeding plate (301), which is fixedly connected to the rear side of the outer wall of the machine body (1). Multiple rollers (302) are equidistantly rotatably connected to the outer wall of the inclined feeding plate (301). An electric push rod (303) is fixedly connected to the front top of the machine body (1). A force relief assembly (304) is slidably connected to the lower middle part of the inner wall of the inclined feeding plate (301).

4. The plastic sheet pressing and positioning fixture according to claim 3, characterized in that: The pressure relief assembly (304) includes a sliding plate (3041), which is slidably connected to the lower part of the inner wall of the inclined feed plate (301). Pressure relief springs (3045) are fixedly connected to the left and right rear ends of the lower part of the inner wall of the inclined feed plate (301). Piston cylinders (3043) are fixedly connected to the left and right sides of the front end of the outer wall of the sliding plate (3041). Exhaust grooves (3042) are opened on the outer wall of the piston cylinders (3043). Piston rods (3044) are fixedly connected to the left and right sides of the front end of the inner wall of the inclined feed plate (301).

5. The plastic sheet pressing and positioning fixture according to claim 4, characterized in that: The exhaust groove (3042) is circular in shape, and the front end of the pressure relief spring (3045) is fixedly connected to the rear side of the outer wall of the sliding plate (3041).

6. The plastic sheet pressing and positioning fixture according to claim 2, characterized in that: The bottom of the L-shaped plate (202) is fixedly connected to the top of the rack (2044), and the outer wall of the L-shaped plate (202) is slidably connected to the inner wall of the U-shaped hollow plate (2045).

7. The plastic sheet pressing and positioning fixture according to claim 2, characterized in that: The rotating gear (2042) meshes with the rack (2044), and the bottom of the servo motor (2041) is fixedly connected to the top of the L-shaped support plate (2043).

8. The plastic sheet pressing and positioning fixture according to claim 1, characterized in that: A hydraulic rod (5) is fixedly connected to the top of the body (1), and a pressure plate (4) is fixedly connected to the bottom end of the hydraulic rod (5).

Images