Polytetrafluoroethylene protective clothing fabric processing equipment

Abstract

The application relates to the technical field of film stretching equipment, in particular to a polytetrafluoroethylene protective clothing fabric processing equipment, which comprises a left rack and a right rack, a left chain is installed on the left rack, a right chain is installed on the right rack, the right side part of the left chain and the left side part of the right chain are arranged at intervals left and right and form a running channel for the forward running of a polytetrafluoroethylene base tape at the intervals, a left pressing positioning block capable of lifting is installed on the chain links of the left chain, a left walking bottom plate for supporting the lower surface of the left side part of the polytetrafluoroethylene base tape and clamping the left side part of the polytetrafluoroethylene base tape in cooperation with the left pressing positioning block is further installed on the left rack and can walk synchronously with the left chain, a right pressing positioning block capable of lifting is installed on the chain links of the right chain, a right walking bottom plate for supporting the lower surface of the right side part of the polytetrafluoroethylene base tape and clamping the right side part of the polytetrafluoroethylene base tape in cooperation with the right pressing positioning block is further installed on the right rack and can walk synchronously with the right chain, and the production efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film stretching equipment, in particular to a polytetrafluoroethylene protective clothing fabric processing equipment. BACKGROUND

[0002] Polytetrafluoroethylene protective clothing fabric is a commonly used film product as one layer of protective clothing, that is, PTFE film. Many existing methods for producing films use a method of stretching the raw material base band in both directions. For example, a bidirectional synchronous stretching device disclosed in application No. 201720460569.5 belongs to the technical field of film stretching equipment, and is symmetrically arranged left and right, comprising a base, two strip-shaped tracks, a transmission chain clamp, and a preheating section, a stretching section, and a shaping section arranged from front to back in the strip-shaped track. The characteristic is that the lower sides of the preheating section and the shaping section are respectively provided with sliding rails matched therewith, the strip-shaped track is provided with an inner rail and an outer rail, a transmission device is arranged between the inner rail and the outer rail, a speed regulation motor is arranged on the transmission device, a transmission chain clamp is fixed on the upper end of the transmission device, and the transmission chain clamp is connected with the inner rail and the outer rail in a sliding manner; and a telescopic member is arranged at the hinge joint of the stretching section and the shaping section and the end of the shaping section.

[0003] The existing method of stretching the film by clamping the transmission chain clamp on both sides and moving forward has been widely adopted. However, the transmission chain clamp mentioned in the above-mentioned document adopts an M-shaped structure, which can only stretch one piece of film and cannot continuously stretch the film. Moreover, the use of the clamp needs to be manually adjusted every time, and the degree of automation is not high, and the production efficiency is not high enough. SUMMARY

[0004] The purpose of the present application is to provide a polytetrafluoroethylene protective clothing fabric processing equipment with high production efficiency.

[0005] The technical problem of the present application is solved by the following technical scheme: a polytetrafluoroethylene protective clothing fabric processing equipment, comprising a left frame and a right frame, a left chain walking back and forth between front and back is installed on the left frame, a right chain walking back and forth between front and back is installed on the right frame, the right side of the left chain and the left side of the right chain are arranged left and right with an interval, and a running channel for the polytetrafluoroethylene base tape to run forward is formed at the interval, a plurality of left pressing positioning blocks for pressing on the upper surface of the left side of the polytetrafluoroethylene base tape and capable of lifting are installed on the chain links of the left chain and walk with the left chain, a left walking bottom plate capable of synchronously walking with the left chain for supporting the lower surface of the left side of the polytetrafluoroethylene base tape and clamping the left side of the polytetrafluoroethylene base tape in cooperation with the left pressing positioning block is also installed on the left frame, a plurality of right pressing positioning blocks for pressing on the upper surface of the right side of the polytetrafluoroethylene base tape and capable of lifting are installed on the chain links of the right chain and walk with the right chain, and a right walking bottom plate capable of synchronously walking with the right chain for supporting the lower surface of the right side of the polytetrafluoroethylene base tape and clamping the right side of the polytetrafluoroethylene base tape in cooperation with the right pressing positioning block is also installed on the right frame.

[0006] As a preferred embodiment of the present application, the left and right distances of at least one section of the running channel gradually increase from back to front.

[0007] As a preferred embodiment of the present application, the left chain is connected with a support frame capable of walking with the left chain, and the left pressing positioning block is movably connected to the support frame.

[0008] As a preferred embodiment of the present application, the support frame is connected with a suspension support shaft for the left pressing positioning block to pass through horizontally and swing up and down.

[0009] As a preferred embodiment of the present application, the left frame is provided with a steering sprocket for the operation and steering of the left chain at both the front and back positions of the left chain, and an upward swinging guide plate for the upward swinging and supporting of the left pressing positioning block is further provided above the left frame, a guide column extending upward is connected to the left pressing positioning block, the upward swinging guide plate is flat and the side edge portion forms an arc-shaped guide edge portion for the side contact of the guide column, and the diameter of the arc-shaped guide edge portion is greater than the diameter of the arc-shaped path of the left chain steering.

[0010] As a preferred embodiment of the present application, the center of the arc-shaped guide edge portion and the center of the arc-shaped path of the left chain steering on the same side are on the same axis.

[0011] As a preferred embodiment of the present application, the guide column is in a cylindrical shape and is rotatably connected to the left pressing positioning block.

[0012] As a preferred embodiment of the present application, the outer circumferential side of the arc-shaped guiding edge portion is a circular arc-shaped curved surface.

[0013] As a preferred embodiment of the present application, an elastic buffering device is connected between the guiding column and the support frame.

[0014] As a preferred embodiment of the present application, the left pressing positioning block is in a cylindrical structure along the horizontal direction in the axial direction.

[0015] The present application has the following advantages: 1. The production continuity is strong, the polytetrafluoroethylene-based tape in roll form can be continuously discharged and stretched, and the clamping of the polytetrafluoroethylene-based tape realizes automatic operation;

[0016] 2. The conveying effect is good, the stretching effect is also good, and the product quality is greatly improved;

[0017] 3. The structure is stable, and the operation is safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall equipment of Example 1.

[0019] Figure 2 is Figure 1 is a schematic diagram of the overall equipment of Example 1.

[0020] In the figure, 1 is a left rack, 2 is a right rack, 3 is a left chain, 4 is a right chain, 12 is a travel channel, a is a left pressing positioning block, b is a left walking bottom plate, c is a right pressing positioning block, d is a right walking bottom plate, e1 is a support frame, e2 is a hanging support shaft, f is a steering sprocket, g is an upper swing guiding plate, e10 is a guiding column, g1 is an arc-shaped guiding edge portion, 31 is an arc-shaped path, h is an elastic buffering device. DETAILED DESCRIPTION

[0021] The following specific examples are merely an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the present examples without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

[0022] Example, such as Figures 1-2The illustrated polytetrafluoroethylene protective clothing fabric processing equipment, including left frame 1 and right frame 2, the left frame 1 is installed with a left chain 3 walking back and forth between the front and back, the right frame 2 is installed with a right chain 4 walking back and forth between the front and back, the right side of the left chain 3 and the left side of the right chain 4 are arranged left and right with an interval and form a running channel 12 for the polytetrafluoroethylene base tape to run forward, the left chain 3 and the right chain 4 are preferably closed loop structures in the horizontal plane, similar to a runway, a front and back circulating reciprocating conveying structure, which is also common, and the two chains will form two turning areas at the front and back ends of the running channel 12, here, the rear end of the running channel 12 as the upstream end is the position where the initial polytetrafluoroethylene base tape enters, and the front end of the running channel 12 as the downstream end is the position where the polytetrafluoroethylene base tape becomes thinner after being stretched left and right, that is, the outlet position of the thinner protective clothing film fabric formed after the thicker polytetrafluoroethylene base tape is stretched, the running channel 12 is the path of the polytetrafluoroethylene base tape running forward from the right rear, and at the front end, the initial thicker polytetrafluoroethylene base tape will be stretched left and right during the running process to form a thinner finished film. The structure design for stretching the polytetrafluoroethylene base tape left and right is that: the links of the left chain 3 are installed with a plurality of left pressing positioning blocks a that walk with the left chain 3 and press on the left side of the polytetrafluoroethylene base tape, the number of left pressing positioning blocks a should be around the entire left chain, that is, designed to be more, so that many left pressing positioning blocks a can press on the left side of the polytetrafluoroethylene base tape, of course, the left frame 1 is also installed with a left walking bottom plate b that walks synchronously with the left chain 3 and supports the left side of the polytetrafluoroethylene base tape and clamps the left side of the polytetrafluoroethylene base tape with the left pressing positioning blocks a, the left pressing positioning blocks a and the left walking bottom plate b can press the left side of the polytetrafluoroethylene base tape up and down, and stretch by extending the distance between the left and right chains during the running process, this clamping structure that walks with the chain makes the polytetrafluoroethylene base tape can be continuously output in rolls and stretched left and right into a film product, which greatly improves the production efficiency.Similarly, the structure design on the right frame can refer to the structure on the left side, and the same structure design can be adopted, but the left side structure is preferably kept in a mirror-symmetrical pattern. Therefore, the right side has corresponding structures. A plurality of right pressing positioning blocks c for pressing the upper surface of the right side of the polytetrafluoroethylene-based belt are installed on the links of the right chain 4 and can move up and down with the right chain 4. The right frame 2 is also provided with a right walking bottom plate d that can move synchronously with the right chain 4 and is used to support the lower surface of the right side of the polytetrafluoroethylene-based belt and clamp the right side of the polytetrafluoroethylene-based belt together with the right pressing positioning block c. The right pressing positioning block c and the right walking bottom plate d clamp the right side of the polytetrafluoroethylene-based belt to convey and stretch it. The left walking bottom plate b can be installed together with the left pressing positioning block a through a corresponding support structure, so that they can move synchronously. Alternatively, a left lower chain is installed below the left chain 3 on the left frame 1. The left walking bottom plate b can be installed on the links of the left lower chain, but the synchronicity of the two chains needs to be ensured. Since each chain is driven by two steering sprockets f in front and back, one of which is connected to the motor shaft as the driving sprocket, for example, the same size steering sprockets f can be arranged on the left chain 3 and the left lower chain at the rear position and arranged vertically. Then, by connecting to the same motor shaft or other transmission equipment, the synchronicity of the two chains can be maintained, thereby ensuring the synchronicity of the left walking bottom plate b and the left pressing positioning block a. Then, the right walking bottom plate d can be installed on the right side by referring to the structure on the left side.

[0023] As described above, the baseband is transported by clamping the left and right sides of the baseband, and the stretching is also relatively simple, that is, controlling the spacing of the running channel 12, generally as long as the left and right spacing of at least one section of the running channel 12 gradually increases forward, mainly to increase the spacing between the right side of the left chain and the left side of the right chain, since the chain is connected to the compression positioning block, the spacing between the left compression positioning block a and the right compression positioning block c will gradually increase to stretch the baseband left and right, of course, the spacing between the left walking bottom plate and the right walking bottom plate will also gradually increase forward corresponding to the same side compression positioning block, mainly to make the tightening and stretching operation better.

[0024] The automatic lifting tightening operation is implemented as follows, taking the left side as an example, the right side is designed as the left side and is mirror symmetric:

[0025] The left chain 3 is connected with a support frame e1 that can run with the left chain 3, and the left compression positioning block a is movably connected to the support frame e1. The support frame e1 can adopt different metal frame structures, and the support frame e1 is fixed to the side of the chain link through a pin shaft, a bolt or direct welding. The movable connection of the left compression positioning block a means that it can at least move up and down, so as to realize lifting in the corresponding position. The specific movable connection structure is that the support frame e1 is connected with a suspension support shaft e2 through which the left compression positioning block a horizontally passes and is used for swinging up and down of the left compression positioning block a. That is, a suspension support shaft e2 needs to be fixedly connected to the support frame e1, which extends horizontally, and the left compression positioning block a is provided with a horizontal through hole and is sleeved on the suspension support shaft e2. When not clamping and transporting, the left compression positioning block a swings upward to the right to not clamp the left side of the polytetrafluoroethylene baseband. When the middle section of the running channel needs to clamp the baseband, the left compression positioning block a swings down to clamp the baseband with the left walking bottom plate b for transportation and subsequent stretching. The suspension support shaft e2 is equivalent to an axis for swinging up and down of the left compression positioning block a. In addition, the left walking bottom plate b can be directly installed and fixed to the support frame e1 and below the left compression positioning block a, so as to realize synchronous operation. In this way, it is not necessary to additionally set a chain for synchronous driving of the left walking bottom plate b. Of course, these structures are necessary conditions for realizing automatic lifting of the left compression positioning block a, and corresponding matching structures are also needed to realize automatic lifting. Of course, existing automatic control equipment such as cylinders and electric products can be used for control, but this way needs many installation components, and the support, turning and space of the chain cannot be well realized. Therefore, the optimization scheme below is more conducive to realizing the automatic lifting function.

[0026] As mentioned above, the left sprocket f is arranged at both the front and rear positions of the left chain 3, and the left chain 3 is driven and turned by the front and rear sprockets f. In this embodiment, a special design is made, as follows. An upper swing guide plate g is arranged above the left sprocket f to swing and support the left pressing positioning block a. The left sprocket 1 can be supported by the swing guide plate g through a supporting rod. The left pressing positioning block a is connected with an upward extending guide column e10. The swing guide plate g is flat and has an arc-shaped guide edge g1 at the side to contact and abut the guide column e10. The diameter of the arc-shaped guide edge g1 is greater than the diameter of the arc-shaped path 31 of the left chain 3. In general, the swing guide plate g can be designed as a circular pie structure, and the diameter is greater than the diameter of the sprocket f, so that the diameter of the arc-shaped guide edge g1 is greater than the diameter of the arc-shaped path 31 of the left chain 3. When the left pressing positioning block a on the non-turning section of the left chain 3 is swung from the lowered state to the turning position, the guide column e10 is tilted to lift the left pressing positioning block a. In the structure design, the left pressing positioning block a and the guide column e10 on the non-turning section are vertically suspended, i.e. in the lowered state to clamp the base tape. This refers to the right part of the left chain. The left part is also vertically lowered, but the left part is a section of the left chain that is unloaded before and after the turning. Both sections can be understood as the clamped state in the lowered state. When the left chain is turned, the guide column e10 is in the same turning path as the arc-shaped path 31, but because of the swing guide plate g, the arc-shaped guide edge g1 of the swing guide plate g is pressed outward to tilt and expand, and the lower part of the guide column e10 is lifted to lift the left pressing positioning block a. After the turning is completed, the guide column e10 is not guided by the outward expansion of the swing guide plate g, and is lowered by gravity to clamp the left part of the base tape with the left walking bottom plate b. As an option, the center of the arc-shaped guide edge g1 is on the same axis as the center of the arc-shaped path 31 of the left chain 3 on the same side, which optimizes the structure and makes the operation more stable. The lifting height does not need to be high, and the angle of the guide column e10 does not need to be large. The swing amplitude is controlled within 30 degrees. The left pressing positioning block a is lifted as high as possible, and the left part of the base tape is basically lifted to the surface.

[0027] The guiding column e10 can be directly fixed to the top of the left pressing positioning block a, but it can also be further optimized. The guiding column e10 is in a cylindrical shape and can be rotatably connected to the left pressing positioning block a. The rotation direction is in a horizontal or nearly horizontal direction, and the axis of the guiding column e10 should be kept locked with the position of the left pressing positioning block a. The guiding column e10 can rotate to allow it to roll on the arc-shaped guiding edge g1 during the turning process, similar to the structure of a roller. This improves the smoothness and reduces the noise caused by fixed sliding friction. The specific structure can further include an upward extending positioning shaft fixed to the top of the left pressing positioning block a. The guiding column e10 is in an up-down open shaft hole structure and is sleeved on the positioning shaft, which can achieve the rolling guiding of the left pressing positioning block a.

[0028] As a preferred, the outer circumferential side of the arc-shaped guiding edge g1 is a circular arc curved surface. First, the path of the arc-shaped guiding edge g1 is preferably a circular arc. Further, the side is designed as a curved surface structure with a lateral circular arc arch. This is a more optimized structure that reduces mechanical wear and improves operational stability.

[0029] To improve the stability of the up and down movement of the left pressing positioning block a, the guiding column e10 and the support frame e1 can be connected with an elastic buffer device h or a damping device. A spring structure or a gas rod structure can be used to reduce mechanical impact and better clamp and transport. However, the elastic force of the elastic buffer device h should not be too large, otherwise it will affect the normal use of the left pressing positioning block a.

[0030] The left pressing positioning block a is preferably made of a steel block weighing more than 1 kg, but not more than 10 kg, which can only achieve a relatively stable falling action. The shape of the left pressing positioning block a can be a cylindrical structure along the horizontal direction. However, further optimization is preferred. The left pressing positioning block a can be designed as a vertical plate structure with a rectangular structure in the middle and a semicircular cylindrical structure on the top and bottom sides. The semicircular cylindrical structure on the top side has corresponding horizontal through holes in front and back and is sleeved on the suspension support shaft e2. The suspension support shaft e2 can be fixed with a lateral connecting rod extending horizontally between the support frames. The semicircular cylindrical structure on the top side can be sleeved on the suspension support shaft e2 and be limited. The connecting rod can be fixed with bolts, pins, or other detachable methods, which facilitates disassembly and maintenance.

[0031] The structure of the right pressing positioning block c on the right side and the connecting structure for the up and down movement of the right pressing positioning block c can adopt the structure of the left pressing positioning block a on the left side and the connecting structure for the up and down movement of the left pressing positioning block a, as long as the structure is consistent and mirror-symmetrical.

[0032] The operation of the whole device is relatively simple. The rolled polytetrafluoroethylene base tape is placed at the turning position at the rear end of the device. Initially, the machine is stopped, and a part of the base tape is pulled out from the shaft to the left and right direction as the first section, and is placed on the left and right rear turning preparation conveying positions, that is, the left walking bottom plate b and the right walking bottom plate d on the left and right sides of the running channel. Since the rear initial section, the left and right chain turning has not been completed, the left pressing positioning block a and the right pressing positioning block c at this position are up and down, and the left and right two edge parts of the base tape are placed on the left walking bottom plate b and the right walking bottom plate d at this position. Then the device is started, and the left walking bottom plate b and the right walking bottom plate d at this position support the base tape to convey forward. Since the turning is immediately completed, the corresponding left pressing positioning block a and right pressing positioning block c of the same group will fall to press the base tape. The subsequent left pressing positioning block a and left walking bottom plate b and right pressing positioning block c and right walking bottom plate d perform the same action from not clamping the base tape to clamping the base tape, and continue to perform the action. Then in the area where the left and right spacing of the running channel in front is expanded, the stretching during the running process can be performed. Of course, some heating devices will be provided in the general device, which is a common design, to facilitate the stretching of the base tape to a film. When the base tape is conveyed to the downstream of the front end, it has become a stretched film structure, that is, the basic prototype of the polytetrafluoroethylene protective clothing fabric. Since some better quality improvement processing is usually required in the rear, it is not described here. The whole process is more automated and has higher efficiency. The left chain runs counterclockwise, and the right chain runs clockwise.

[0033] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A processing equipment for polytetrafluoroethylene (PTFE) protective clothing fabric, characterized in that, The left frame (1) is provided with a left chain (3) walking back and forth, the right frame (2) is provided with a right chain (4) walking back and forth, the right part of the left chain (3) and the left part of the right chain (4) are arranged left and right with an interval, and the interval forms a running channel (12) for the polytetrafluoroethylene base to run forward, the chain links of the left chain (3) are provided with a plurality of left pressing positioning blocks (a) walking with the left chain (3) and pressing on the upper surface of the left side of the polytetrafluoroethylene base, the left frame (1) is further provided with a left walking bottom plate (b) walking synchronously with the left chain (3) and supporting the lower surface of the left side of the polytetrafluoroethylene base and clamping the left side of the polytetrafluoroethylene base with the left pressing positioning block (a), the chain links of the right chain (4) are provided with a plurality of right pressing positioning blocks (c) walking with the right chain (4) and pressing on the upper surface of the right side of the polytetrafluoroethylene base, and the right frame (2) is further provided with a right walking bottom plate (d) walking synchronously with the right chain (4) and supporting the lower surface of the right side of the polytetrafluoroethylene base and clamping the right side of the polytetrafluoroethylene base with the right pressing positioning block (c). The left chain (3) is connected with a support frame (e1) walking with the left chain (3). The support frame (e1) is connected with a suspension support shaft (e2) for the left pressing positioning block (a) to pass through horizontally and swing up and down. The left frame (1) is provided with a steering sprocket (f) for the left chain (3) to run and steer at the front and rear two steering positions of the left chain (3), and the left frame (1) is further provided with an upward swing guide plate (g) for the left pressing positioning block (a) to swing upward and support, the left pressing positioning block (a) is connected with an upward extending guide column (e10), the upward swing guide plate (g) is flat and the side edge part forms an arc-shaped guide edge (g1) for the side of the guide column (e10) to contact and abut, and the diameter of the arc-shaped guide edge (g1) is greater than the diameter of the arc-shaped path (31) of the left chain (3) steering. The center of the arc-shaped guide edge (g1) and the center of the arc-shaped path (31) of the left chain (3) on the same side are on the same axis.

2. The polytetrafluoroethylene protective clothing fabric processing equipment according to claim 1, characterized in that, The left and right distance of at least one section of the running channel (12) gradually increases from back to front.

3. The polytetrafluoroethylene protective clothing fabric processing apparatus according to claim 1, characterized in that, The guide column (e10) is in a cylindrical shape and is rotatably connected to the left pressing positioning block (a).

4. The polytetrafluoroethylene protective clothing fabric processing apparatus according to claim 1, characterized in that, The outer peripheral side of the arc-shaped guide edge (g1) is a circular arc curved surface.

5. The polytetrafluoroethylene protective clothing fabric processing apparatus according to claim 1, characterized in that, The guide column (e10) and the support frame (e1) are connected with an elastic buffer device (h).

6. The polytetrafluoroethylene protective clothing fabric processing apparatus according to claim 1, characterized in that, The left pressing positioning block (a) is in a cylindrical structure along the horizontal direction in the axial direction.

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