A film transverse stretching fixture

Abstract

The invention discloses a film transverse stretching clamp, comprising a chain and a plurality of clamps arranged on the chain, wherein the clamp comprises a base and a clamping handle rotatably arranged on the base; the base is rollingly connected to the outer side surface of a guide rail through a first guide wheel, the base is rollingly connected to the inner side surface of the guide rail through a second guide wheel, and the base is rollingly connected to the top surface of the guide rail through a third guide wheel; the chain comprises a plurality of groups of inner links and outer links, and the inner links and the outer links are connected through a mandrel, a sleeve, and a roller; a first oil-free self-lubricating bearing is arranged between the roller and the sleeve; a second oil-free self-lubricating bearing is arranged between the sleeve and the mandrel; and the base is fixedly connected to the outer link of the chain through a latch. The chain and the clamp do not need to be lubricated with a large amount of grease; the technical problem that the grease will be carbonized at high temperature and form powder adhering to the film is fundamentally solved.

Description

Technical Field

[0001] The invention relates to the technical field of film stretching production lines, and in particular to a film transverse stretching clamp. Background Art

[0002] In the production process of BOPP film (biaxially oriented polypropylene film), the film needs to be stretched transversely after the longitudinal stretching process. The traditional clamp consists of a chain and a clamp arranged on the chain. After the clamp clamps the film, the clamp moves forward and stretches transversely along the guide rail under the traction of the chain. In order to reduce the transmission wear of each link on the chain and make the chain links work smoothly and stably, a large amount of grease needs to be applied to the chain to reduce the transmission friction between the links. In addition, the clamp adopts a slider and a guide rail for sliding connection, so a large amount of grease needs to be applied to the guide rail to reduce the friction loss between the slider and the guide rail. Since the clamp is set in a film transverse stretching machine chassis under long-term high temperature, the grease will carbonize under high temperature and form powder that adheres to the film, affecting product quality.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a film transverse stretching clamp, aiming to improve the chain and the clamp so that the chain and the clamp do not need to be lubricated with grease, thereby solving the technical problem that grease will carbonize at high temperature and affect product quality.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A film transverse stretching clamp comprises a chain and a plurality of clamps arranged on the chain, the clamp comprising a base and a clamping handle rotatably arranged on the base; the base is rollingly connected to the outer side surface of a guide rail through a first guide wheel, the base is rollingly connected to the inner side surface of the guide rail through a second guide wheel, and the base is rollingly connected to the top surface of the guide rail through a third guide wheel; the center line of the first guide wheel and the second guide wheel is in the direction of the plumb line; the center line direction of the third guide wheel is in the horizontal direction; the chain comprises a plurality of groups of inner chain links and outer chain links, the inner chain links and the outer chain links are connected through a core shaft, a sleeve, and a roller; the inner chain links are connected to the sleeve, and the outer chain links are connected to the core shaft; the sleeve is sleeved on the outer periphery of the core shaft, and the roller is sleeved on the outer periphery of the sleeve; a first oil-free self-lubricating bearing is provided between the roller and the sleeve; a second oil-free self-lubricating bearing is provided between the sleeve and the core shaft; the chain passes through the base, and the base is fixedly connected to the outer chain links of the chain through a pin.

[0007] The middle part of the clamping handle is rotatably mounted on the base through a swing shaft, the tail of the clamping handle faces upward, and the head of the clamping handle and the clamping surface of the base clamp the film together.

[0008] A spring sleeve is provided between the middle part of the clamping handle and the base, a spring is provided in the spring sleeve, one end of the spring sleeve is provided with a cylindrical hole, and the other end is provided with a waist-shaped hole; one end of the spring is connected to the clamping handle through a first cylindrical pin and the first cylindrical pin is inserted into the cylindrical hole, and the other end of the spring is connected to the base through a second cylindrical pin and the second cylindrical pin is inserted into the waist-shaped hole.

[0009] The first guide wheel includes two first upper guide wheels distributed front and back and two first lower guide wheels corresponding thereto; the second guide wheel includes two second upper guide wheels distributed front and back and two second lower guide wheels corresponding thereto.

[0010] The second upper guide wheel is arranged directly above the chain, and the second lower guide wheel is arranged directly below the chain.

[0011] The first guide wheel, the second guide wheel and the third guide wheel are all connected to the base through bolts.

[0012] Each group of inner chain links includes a pair of inner chain plates arranged in parallel, and the two inner chain plates are connected to the sleeve; each group of outer chain links includes a pair of outer chain plates arranged in parallel, and the two outer chain plates are connected to the core shaft; a connecting hole for the pin to pass through is opened in the middle of each outer chain plate.

[0013] The base includes an upper bracket and a base, the upper bracket is provided with a countersunk hole, the base is provided with a positioning hole, the latch includes a limit head, a pin shaft section, a positioning section, and a threaded fixing section connected in sequence, the latch passes through the countersunk hole, two connecting holes, and the positioning hole in sequence from top to bottom, the limit head is arranged in the countersunk hole, the positioning section is arranged in the positioning hole, the threaded fixing section passes through the positioning hole and is screwed into a nut.

[0014] Circlips are provided at both ends of the sleeve, and the circlips are located between the outer link plate and the sleeve.

[0015] A wear-resistant pad is arranged between the retaining ring and the outer link plate.

[0016] Beneficial effects:

[0017] Compared with the prior art, the film transverse stretching clamp provided by the present invention realizes the positioning of the clamp by pressing the first guide wheel, the second guide wheel, and the third guide wheel against the inner side, the outer side, and the top surface of the guide rail. The first guide wheel, the second guide wheel, and the third guide wheel roll forward along the guide direction of the guide rail, and the clamp moves smoothly; and because the rolling friction is smaller than the friction coefficient of sliding friction, the friction between the high-speed moving clamp and the guide rail is greatly reduced, so the guide rail and the guide wheel can maintain a good working state even under oil-free lubrication conditions, without the need to use a large amount of grease for lubrication. In addition, the first self-lubricating bearing greatly reduces the friction and wear between the roller and the sleeve, ensuring the flexibility and service life of the roller; and the sleeve and the mandrel are connected by the second self-lubricating bearing, which further reduces the friction loss between the sleeve and the mandrel, making the transmission of the chain more stable and extending the service life of the chain. Since the first self-lubricating bearing and the second self-lubricating bearing do not require oil lubrication, they have excellent wear resistance and can maintain good working condition under high temperature conditions, so that the chain can work under oil-free lubrication conditions, and the chain does not need to use a large amount of grease for lubrication; fundamentally solving the technical problem that grease will carbonize under high temperature conditions and form powder adhering to the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the film transverse stretching fixture provided by the present invention.

[0019] Figure 2 The longitudinal section diagram of the film transverse stretching clamp provided by the present invention is a schematic diagram of a clamp in a closed state.

[0020] Figure 3 This is a schematic longitudinal section diagram of the film transverse stretching clamp provided by the present invention, with the clamp in the open state.

[0021] Figure 4 This is a schematic structural diagram of a chain in the film transverse stretching clamp provided by the present invention.

[0022] Figure 5 for Figure 4 Middle CC section view.

[0023] Figure 6 This is a top view of the chain in the film transverse stretching fixture provided by the present invention.

[0024] Main component symbols: 1-chain, 2-clamp, 21-base, 22-clamping handle, 31-first guide wheel, 32-second guide wheel, 33-third guide wheel, 4-guide rail, 11-inner chain link, 12-outer chain link, 13-core shaft, 14-sleeve, 15-roller, 16-first oil-free self-lubricating bearing, 17-second oil-free self-lubricating bearing, 5-pin, 23-swing shaft, 61-spring sleeve, 62-cylindrical hole, 63-waist hole, 64-first A cylindrical pin, 65-a second cylindrical pin, 10-a connecting hole, 18-a retaining ring, 19-a wear-resistant pad, 311-a first upper guide wheel, 312-a first lower guide wheel, 321-a second upper guide wheel, 322-a second lower guide wheel, 111-an inner chain plate, 121-an outer chain plate, 211-an upper bracket, 212-a base, 213-a countersunk hole, 214-a positioning hole, 51-a limiting head, 52-a pin shaft section, 53-a positioning section, 54-a threaded fixing section. DETAILED DESCRIPTION

[0025] The present invention provides a film transverse stretching clamp. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0026] See also Figure 1-Figure 6 The present invention provides a film transverse stretching clamp, wherein the inner side surface of the guide rail is an end surface facing the clamping handle, and the outer side surface of the guide rail is opposite to the inner side surface.

[0027] The film transverse stretching clamp comprises a chain 1 and a plurality of clamps 2 arranged on the chain 1, wherein the clamp 2 comprises a base 21 and a clamping handle 22 rotatably arranged on the base 21; the base 21 is rollingly connected to the outer side surface of the guide rail 4 through a first guide wheel 31, the base 21 is rollingly connected to the inner side surface of the guide rail 4 through a second guide wheel 32, and the base 21 is rollingly connected to the top surface of the guide rail 4 through a third guide wheel 33; the center lines of the first guide wheel 31 and the second guide wheel 32 are in the direction of the plumb line; the center line direction of the third guide wheel 33 is in the horizontal direction; the chain 1 includes a plurality of clamps 21 and a plurality of clamps 22 arranged on the chain 1; the clamps 21 and the clamps 22 are rollingly connected to the outer side surface of the guide rail 4 through a first guide wheel 31, the base 21 is rollingly connected to the inner side surface of the guide rail 4 through a second guide wheel 32, and the base 21 is rollingly connected to the top surface of the guide rail 4 through a third guide wheel 33; the center lines of the first guide wheel 31 and the second guide wheel 32 are in the direction of the plumb line; the center line direction of the third guide wheel 33 is in the horizontal direction; the chain 1 includes a plurality of clamps 21 and a plurality of clamps 22 arranged on the chain 1; the plurality of clamps 21 and a plurality of clamps 22 are rollingly connected to the outer side surface of the guide rail 4 through a first guide wheel 31, the base 21 is rollingly connected to the inner side surface of the guide rail 4 through a second guide wheel 32, and the base 21 is rollingly connected to the top surface of the guide rail 4 through a third guide wheel 33; the center lines of the first guide wheel 31 and the second guide wheel 32 are It includes multiple groups of inner links 11 and outer links 12, the inner links 11 and the outer links 12 are connected through a core shaft 13, a sleeve 14, and a roller 15; the inner links 11 are connected to the sleeve 14, and the outer links 12 are connected to the core shaft 13; the sleeve 14 is sleeved on the outer periphery of the core shaft 13, and the roller 15 is sleeved on the outer periphery of the sleeve 14; a first oil-free self-lubricating bearing 16 is provided between the roller 15 and the sleeve 14; a second oil-free self-lubricating bearing 17 is provided between the sleeve 14 and the core shaft 13; the chain 1 passes through a base 21, and the base 21 is fixedly connected to the outer link 12 of the chain 1 through a pin 5.

[0028] In actual assembly, the chain 1 is composed of inner links 11 and outer links 12 connected alternately one by one, each clamp 2 corresponds to a group of outer links 12, and the clamp 2 is connected to the chain 1 through the latch 5; the roller 15 on the chain 1 contacts the sprocket, thereby driving the chain 1 to move. After the clamp clamps the film, the chain 1 pulls the clamp 2 forward, and the film is stretched horizontally under the guidance of the guide rail 4.

[0029] Compared with the prior art, the film transverse stretching clamp provided by the present invention realizes the positioning of the clamp by pressing the first guide wheel 31, the second guide wheel 32, and the third guide wheel 33 against the inner side, the outer side, and the top surface of the guide rail 4. The first guide wheel 31, the second guide wheel 32, and the third guide wheel 33 roll forward along the guide direction of the guide rail 4, so that the clamp 2 moves smoothly. As is known to all, the friction coefficient of rolling friction is smaller than that of sliding friction, so that the friction between the high-speed clamp 2 and the guide rail 4 is greatly reduced, and the contact surface of the guide rail 4 is less worn, so the guide rail 4 and the guide wheel can also maintain a good working state under oil-free lubrication conditions. In addition, the first self-lubricating bearing greatly reduces the friction and wear between the roller 15 and the sleeve 14, ensuring the flexibility and service life of the roller 15. Moreover, the sleeve 14 is connected to the mandrel 13 through the second self-lubricating bearing, which further reduces the friction loss between the sleeve 14 and the mandrel 13, making the transmission of the chain 1 more stable and extending the service life of the chain 1. Since the first self-lubricating bearing and the second self-lubricating bearing do not need oil lubrication, they have excellent wear resistance and can maintain good working condition under high temperature conditions, so that the chain 1 can work under oil-free lubrication conditions, and the surface of the chain 1 does not need to be lubricated with a large amount of grease; the technical problem that grease will carbonize under high temperature conditions and form powder adhering to the film is fundamentally solved.

[0030] Specifically, the middle part of the clamping handle 22 is rotatably mounted on the base 21 through the swing shaft 23, the tail of the clamping handle 22 faces upward, and the head of the clamping handle 22 and the clamping surface of the base 21 clamp the film together. In actual application, the clamp is closed or opened through the action of the closing mechanism and the opening mechanism.

[0031] Preferably, see Figure 2 and Figure 3 A spring sleeve 61 is provided between the middle of the clamping handle 22 and the base 21, a spring 66 is provided in the spring sleeve 61, a cylindrical hole 62 is provided at one end of the spring sleeve 61, and a waist-shaped hole 63 is provided at the other end; one end of the spring 66 is connected to the clamping handle 22 through a first cylindrical pin 64 and the first cylindrical pin 64 is inserted into the cylindrical hole 62, and the other end of the spring 66 is connected to the base 21 through a second cylindrical pin 65 and the second cylindrical pin 65 is inserted into the waist-shaped hole 63. The waist-shaped hole 63 extends along the length direction of the spring sleeve 61.

[0032] The closing process of the clamp 2 is as follows: its initial state is open. Figure 3 As shown, when the clamping handle 22 is subjected to an inner force, that is, Figure 3 The force in the direction of the arrow A in the figure is applied, and the clamping handle 22 rotates clockwise around the swing shaft 23. The head of the clamping handle 22 swings downward to press the clamping surface of the base 21. At this time, the first cylindrical pin 64 rotates downward under the drive of the clamping handle 22, and the spring sleeve 61 rotates counterclockwise around the second cylindrical pin 65. At the same time, the spring sleeve 61 slides to the right along its waist-shaped hole 63, and the first cylindrical pin 64 and the spring sleeve 61 move to the right together, so that the first cylindrical pin 64 approaches the second cylindrical pin 65, and the distance between them is reduced, and the spring 66 is compressed. When the centers of the swing shaft 23, the first cylindrical pin 64, and the second cylindrical pin 65 are connected in a straight line, the distance between the first cylindrical pin 64 and the second cylindrical pin 65 is the shortest, and the spring compression is the largest; when the tail of the clamping handle 22 is no longer subjected to force, the center line of the first cylindrical pin 64 is lower than the center line of the second cylindrical pin 65, and the spring 66 presses the clamping handle 22 to keep the clamp 2 in a closed state.

[0033] The opening process of the clamp 2 is as follows: its initial state is closed as Figure 2 As shown, when the clamping handle 22 receives the external force, that is, Figure 2 The force in the direction indicated by the arrow B in the figure causes the clamping handle 22 to rotate counterclockwise around the swing shaft 23, and the head of the clamping handle 22 swings upward and gradually separates from the clamping surface of the base 21. At this time, the first cylindrical pin 64 rotates upward under the drive of the clamping handle 22, and the spring sleeve 61 rotates clockwise around the second cylindrical pin 65. When the tail of the clamping handle 22 is no longer subjected to force, the clamping handle continues to rotate under the action of inertia until the clamping handle stops after contacting the base. At this time, the center line of the first cylindrical pin 64 is higher than the center line of the swing shaft 23 and the second cylindrical pin 65, and the clamp 2 is opened. The spring 66 pushes the clamping handle 22 to keep the clamp 2 in the open state.

[0034] For further information, see Figure 1-3 The first guide wheel 31 includes two first upper guide wheels 311 and two corresponding first lower guide wheels 312 arranged front and back; the second guide wheel 32 includes two second upper guide wheels 321 and two corresponding second lower guide wheels 322 arranged front and back. Through the joint positioning of the multiple guide wheels, the clamp 2 moves smoothly and stably along the guide rail 4.

[0035] Preferably, see Figure 2 and 3 The second upper guide wheel 321 is arranged just above the chain 1, and the second lower guide wheel 322 is arranged just below the chain 1. By such arrangement, the structure of the clamp 2 is more compact and reasonable.

[0036] Preferably, see Figure 2 and3 The first guide wheel 31 and the third guide wheel 33 are connected to the base 21 by bolts 71, and the second guide wheel 32 is connected to the base by a fixed pin shaft. It is convenient for the first guide wheel 31, the second guide wheel 32, and the third guide wheel 33 to be detachably connected to the base 21, and even if the guide wheel is damaged, it is easy to replace.

[0037] For details, please refer to Figure 5 and 6 Each group of inner chain links 11 includes a pair of inner chain plates 111 arranged in parallel, and the two inner chain plates 111 are connected to the sleeve 14; each group of outer chain links 12 includes a pair of outer chain plates 121 arranged in parallel, and the two outer chain plates 121 are connected to the mandrel 13; a connecting hole 10 for the pin 5 to pass through is opened in the middle of each outer chain plate 121. The mandrel 13 and the two outer chain plates 121 are connected by interference fit; the outer ring of the first oil-free self-lubricating bearing 16 is interference fit with the roller 15, the inner ring of the first oil-free self-lubricating bearing 16 is clearance fit with the sleeve 14, the inner ring of the second self-lubricating bearing 17 is clearance fit with the mandrel 13, and the outer ring of the second oil-free self-lubricating bearing 17 is interference fit with the sleeve 14.

[0038] For further information, see Figure 1 The base 21 includes an upper bracket 211 and a base 212. The upper bracket 211 is provided with a countersunk hole 213, and the base 212 is provided with a positioning hole 214. The latch 5 includes a limit head 51, a pin shaft section 52, a positioning section 53, and a threaded fixing section 54 connected in sequence. The latch 5 passes through the countersunk hole 213, two connecting holes 10, and the positioning hole 214 from top to bottom. The limit head 51 is arranged in the countersunk hole 213, and the positioning section 53 is arranged in the positioning hole 214. The threaded fixing section 54 passes through the positioning hole 214 and is screwed into a nut 55. The upper surface of the nut 55 is abutted against the lower surface of the base 212 to achieve the connection between the upper bracket and the base.

[0039] Preferably, see Figure 5 , retaining rings 18 are provided at both ends of the sleeve 14, and the retaining rings 18 are located between the outer link plate 121 and the sleeve 14. The retaining ring 18 is sleeved on the core shaft 13, and can position the sleeve 14 to prevent the sleeve 14 from axial movement.

[0040] In order to reduce the wear of the retaining ring 18 and the outer link plate 121 , a wear-resistant pad 19 is provided between the retaining ring 18 and the outer link plate 121 .

[0041] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A film transverse stretching fixture, characterized in that: The chain comprises a chain and a plurality of clamps arranged on the chain, the clamp comprising a base and a clamping handle rotatably arranged on the base; the base is rollingly connected to the outer side surface of the guide rail through a first guide wheel, the base is rollingly connected to the inner side surface of the guide rail through a second guide wheel, and the base is rollingly connected to the top surface of the guide rail through a third guide wheel; the center line of the first guide wheel and the second guide wheel is the plumb line direction; the center line direction of the third guide wheel is the horizontal direction; the chain comprises a plurality of groups of inner chain links and outer chain links, the inner chain links and the outer chain links are connected through a core shaft, a sleeve, and a roller; the inner chain links are connected to the sleeve, and the outer chain links are connected to the core shaft; the sleeve is sleeved on the outer periphery of the core shaft, and the roller is sleeved on the outer periphery of the sleeve; a first oil-free self-lubricating bearing is arranged between the roller and the sleeve; a second oil-free self-lubricating bearing is arranged between the sleeve and the core shaft; the chain passes through the base, and the base is fixedly connected to the outer chain link of the chain through a latch; The middle part of the clamping handle is rotatably mounted on the base through a swing shaft, the tail of the clamping handle faces upward, and the head of the clamping handle and the clamping surface of the base clamp the film together; a spring sleeve is provided between the middle part of the clamping handle and the base, a spring is provided in the spring sleeve, one end of the spring sleeve is provided with a cylindrical hole, and the other end is provided with a waist-shaped hole; one end of the spring is connected to the clamping handle through a first cylindrical pin and the first cylindrical pin is inserted into the cylindrical hole, and the other end is connected to the base through a second cylindrical pin and the second cylindrical pin is inserted into the waist-shaped hole; the first guide wheel includes two first upper guide wheels distributed front and back and two first lower guide wheels corresponding thereto; the second guide wheel includes two second upper guide wheels distributed front and back and two second lower guide wheels corresponding thereto; the second upper guide wheel is arranged directly above the chain, and the second lower guide wheel is arranged directly below the chain; the first guide wheel, the second guide wheel and the third guide wheel are all connected to the base through bolts.

2. The film transverse stretching fixture according to claim 1, characterized in that: Each group of inner chain links includes a pair of inner chain plates arranged in parallel, and the two inner chain plates are connected to the sleeve; each group of outer chain links includes a pair of outer chain plates arranged in parallel, and the two outer chain plates are connected to the core shaft; a connecting hole for the pin to pass through is opened in the middle of each outer chain plate.

3. The film transverse stretching fixture according to claim 2, characterized in that: The base includes an upper bracket and a base, the upper bracket is provided with a countersunk hole, the base is provided with a positioning hole, the latch includes a limit head, a pin shaft section, a positioning section, and a threaded fixing section connected in sequence, the latch passes through the countersunk hole, two connecting holes, and the positioning hole in sequence from top to bottom, the limit head is arranged in the countersunk hole, the positioning section is arranged in the positioning hole, the threaded fixing section passes through the positioning hole and is screwed into a nut.

4. The film transverse stretching fixture according to claim 2, characterized in that: Circlips are provided at both ends of the sleeve, and the circlips are located between the outer link plate and the sleeve.

5. The film transverse stretching fixture according to claim 4, characterized in that: A wear-resistant pad is arranged between the retaining ring and the outer link plate.

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