Upper and lower clamping plates of a thread gripper

Abstract

The utility model discloses a kind of upper and lower clamping plates of thread clamp, including upper clamping plate and lower clamping plate. Lower clamping plate both ends are equipped with the first hook connected with thread clamp main body, still be equipped with the clamping groove movably connected with upper clamping plate. Upper clamping plate one end is equipped with the second hook compatible with clamping groove. Upper and lower clamping plate are equipped with second hole. Adjustable elastic component includes threaded connecting rod, nut, step, stop block and spring, by setting threaded groove in connecting rod near stop block one end, or in stop block near spring end set annular recess, or set by the upper adjusting ring and lower adjusting ring of ladder face cooperation, realize the adjustment of spring elasticity. In addition, the surface of upper and lower clamping plate is equipped with opposite first protrusion and second protrusion, preferably waist type protrusion. Lower clamping plate is equipped with air blowing hole, and upper clamping plate both sides are equipped with lip, and one end is equipped with inclined surface. The utility model realizes the adjustment of clamping force, effectively compensates the spring force attenuation caused by long-term use, prolongs maintenance cycle.

Description

Technical Field

[0001] This utility model relates to the field of textile machinery technology, specifically to an upper and lower clamping plate of a yarn clamping device. Background Technology

[0002] In textile production, the yarn bobbin liner is a crucial component of warping machines, doubling machines, and other textile equipment, primarily used to support and arrange yarn bobbins. The yarn clamp, as a key functional component of the yarn bobbin liner, directly affects the stability of yarn tension and production quality. The upper and lower clamping plates of the yarn clamp are essential components for holding the yarn in place after breakage, and are an indispensable part of the warping machine's yarn bobbin liner control system. Traditional yarn clamps have the following problems with their upper and lower clamping plates.

[0003] First, traditional yarn clamps are difficult to adjust in terms of clamping force, meaning the spring force between the upper and lower clamping plates cannot be adjusted. Generally, to improve stability, the nut on the connecting rod is tightened during installation, often using a lock-lock nut. Therefore, when the spring is under constant pressure, its elasticity is easily affected, leading to a decrease in clamping force when clamping yarn. This can cause yarn breakage or affect yarn retention, requiring replacement of the lock-lock nut, which is troublesome. Furthermore, different yarns require different clamping forces. Traditional yarn clamps use fixed-elasticity spring assemblies, making clamping force adjustment impossible, frequently resulting in problems with excessive or insufficient clamping force.

[0004] Secondly, traditional upper and lower clamping plates use two smooth plates to clamp the yarn (e.g., a tension yarn clamp on a new type of warping machine, CN206828721U). These smooth plates are prone to bending, causing gaps between the upper and lower clamping plates. When the yarn is at a bend, it cannot be clamped properly, resulting in a high error rate. Another method involves machining square protrusions on the upper and lower clamping plates (e.g., a detachable yarn clamp, CN210117484U). While this solves the high error rate problem, the corners of the square protrusions are prone to breakage or uneven clamping surfaces during the stamping of the upper and lower clamping plates. To solve this problem, the square protrusions need to be made larger, increasing the overall size of the yarn clamp and causing numerous inconveniences.

[0005] In addition, there are often hundreds or thousands of yarn clamps on the warping machine's bobbin stand. Therefore, if the cost of a single upper or lower clamp plate varies greatly, it will increase the overall cost of the warping machine's bobbin stand significantly.

[0006] Therefore, there is an urgent need for a new type of yarn clamping device with reasonable structure, reliable performance, and convenient adjustment of upper and lower clamping plates to solve these problems. Utility Model Content

[0007] The purpose of this utility model is to overcome the defects existing in the prior art and provide an upper and lower clamping plate for a yarn clamping device.

[0008] To achieve the above objectives, the technical solution of this utility model is to design an upper and lower clamping plate for a yarn clamping device, including an upper clamping plate and a lower clamping plate. The lower clamping plate has first hooks at both ends for connection to the main body of the yarn clamping device, and also has slots for movable connection with the upper clamping plate. The upper clamping plate has a second hook at one end that matches the slots. Both the lower and upper clamping plates have first holes for an adjustable elastic component to pass through, and both also have second holes for a yarn-passing ceramic component to pass through. The adjustable elastic component includes a connecting rod, one end of which is threaded, has a nut at the thread, and a step at the thread. The other end of the connecting rod has a stop, and a spring is fitted onto the connecting rod. By providing an adjustable elastic component on the lower and upper clamping plates, the spring force can be adjusted, thereby adjusting the clamping force.

[0009] Optionally, the connecting rod has a threaded groove near the stop for one end of the spring to enter. By rotating one end of the spring, its end is screwed into the threaded groove, thereby changing the spring's compression.

[0010] Optionally, the stop block has an annular groove near the spring end. The annular groove can accommodate part of the spring, and when a large clamping force is required, the spring located in the annular groove can be unscrewed. The width of the annular groove should be adapted to the wire diameter of the spring, preferably slightly smaller than the wire diameter of the spring, so that the two have an interference fit, but the spring can be screwed into or out of the annular groove by twisting.

[0011] Optionally, an upper adjusting ring and a lower adjusting ring are provided between the stop block and the spring for adjusting the distance between them by rotation. Both the upper and lower adjusting rings are fitted onto the connecting rod. Each ring has a flat surface at one end and a stepped surface along the circumference at the other. The stepped surfaces of the upper and lower adjusting rings are positioned opposite each other, and each stepped surface has a correspondingly cooperating positioning protrusion and positioning groove. The relative rotation of the upper and lower adjusting rings changes their combined total thickness, thereby achieving fine adjustment of the spring preload. The stepped surface design provides a clear sense of adjustment, and the cooperation of the positioning protrusion and positioning groove ensures that the adjusting rings will not rotate on their own during operation, maintaining the stability of the adjustment state.

[0012] Furthermore, the surfaces of the lower clamping plate and the upper clamping plate are respectively provided with a first protrusion and a second protrusion, and the protruding surfaces of the first protrusion and the second protrusion are arranged opposite to each other.

[0013] Preferably, the first and second protrusions are waist-shaped protrusions. Waist-shaped protrusions have a longer length and smoother edges, providing a more uniform distribution of clamping force and avoiding excessive local compression of the yarn. Compared to the square protrusions described in the prior art, they do not suffer from breakage at the corners or uneven clamping surfaces, and the dimensions of the upper and lower clamping plates can be further reduced.

[0014] Furthermore, both the lower and upper clamping plates are provided with reinforcing ribs on their surfaces. These ribs effectively prevent bending and deformation of the clamping plates during long-term use, maintain the flatness of the clamping surfaces, and ensure uniform distribution of clamping force.

[0015] Furthermore, the lower clamping plate is provided with air blowing holes for the cleaning component. In order to reduce the impact of fly shavings or lint generated during processing on normal yarn, some yarn clamps are equipped with cleaning components that use pulsed gas to blow away the fly shavings. The air blowing holes are designed to be compatible with yarn clamps equipped with cleaning components.

[0016] Furthermore, the upper clamping plate has lips on both sides, and an inclined surface at the end away from the second hook. By providing lips on both sides and an inclined surface at one end of the upper clamping plate, the smoothness of yarn introduction and delivery is improved. The curved surface structure also prevents wear on the yarn.

[0017] The advantages and beneficial effects of this utility model are as follows: 1. The clamping force is adjusted via an adjustable elastic component. The stepped surfaces of the upper and lower adjusting rings mate, and the clamping force can be precisely controlled by rotating the adjusting rings to change their combined thickness. The spring force can also be changed by screwing the spring into or out of the annular groove or threaded slot. This allows the same yarn clamp to adapt to different types and specifications of yarn, greatly improving the equipment's versatility and adaptability. It also avoids the need to remove the anti-loosening nut to replace the spring when it is constantly under pressure.

[0018] 2. The waist-shaped protrusion has a longer length and smooth edges, which can provide a more uniform distribution of clamping force and avoid excessive local compression of the yarn. Compared with the square protrusion mentioned in the background technology, there will be no breakage or uneven clamping surface at the corners, and the size of the upper and lower clamping plates can also be further reduced.

[0019] 3. The improvement of individual upper and lower clamping plates results in a small increase in cost and high economic benefits. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the upper and lower clamping plates of this utility model; Figure 2This is a schematic diagram of the structure of the upper clamping plate of this utility model; Figure 3 This is a schematic diagram of the structure of the first adjustable elastic component of this utility model. Figure 4 This is a schematic diagram of the structure of the second adjustable elastic component of this utility model; Figure 5 This is a structural schematic diagram of the third adjustable elastic component of this utility model; Figure 6 This is a schematic diagram of the upper and lower adjusting rings of this utility model.

[0021] In the diagram: 1. Upper clamping plate; 11. Second hook; 12. First protrusion; 13. Reinforcing rib; 14. Lip; 15. Inclined surface; 2. Lower clamping plate; 21. First hook; 22. Slot; 23. First hole; 24. Second hole; 25. Second protrusion; 26. Air blowing hole; 3. Adjustable elastic component; 31. Connecting rod; 311. Threaded groove; 32. Thread; 33. Nut; 34. Step; 35. Stop; 351. Annular groove; 36. Spring; 371. Upper adjusting ring; 372. Lower adjusting ring; 373. Positioning protrusion; 374. Positioning groove. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] according to Figures 1-2 As shown, this utility model relates to an upper and lower clamping plates for a yarn clamp, comprising an upper clamping plate 1 and a lower clamping plate 2. The lower clamping plate 2 serves as a basic support component, while the upper clamping plate 1 serves as a movable clamping component. The two are combined through a specific connection method to form a complete yarn clamping unit.

[0024] The lower clamping plate 2 is made of high-strength engineering plastic or lightweight alloy material, possessing sufficient rigidity and strength. At both ends of the lower clamping plate 2, first hooks 21 are provided for connection to the yarn clamping device body (not shown in the figure). The specific structure of the first hook 21 is an outwardly curved hook shape, ensuring a stable and reliable connection with the corresponding connection structure on the yarn clamping device body. Two sets of four first hooks 21 are distributed at both ends of the lower clamping plate 2, forming a stable two-point support structure.

[0025] At one offset end of the lower clamping plate 2, a slot 22 is provided for movably connecting with the upper clamping plate 1. The slot 22 is an elongated opening structure, the width of which is slightly larger than the thickness of the second hook 11 on the upper clamping plate 1, ensuring that the second hook 11 can move within the slot 22 to a limited extent. The design of the slot 22 ensures the reliability of the connection without restricting the necessary range of motion of the upper clamping plate 1.

[0026] according to Figure 2 As shown, the upper clamping plate 1 is also made of high-strength engineering plastic or lightweight alloy material, and its length and width match those of the lower clamping plate 2. At one end of the upper clamping plate 1, a second hook 11 is provided, which is adapted to the slot 22. The shape and size of the second hook 11 are adapted to the slot 22, forming a movable connection structure. This connection method allows the upper clamping plate 1 to open and close within a certain range relative to the lower clamping plate 2, facilitating the insertion and removal of yarn.

[0027] At corresponding positions on the lower clamping plate 2 and the upper clamping plate 1, a first hole 23 is provided for the adjustable elastic component 3 to pass through. The first hole 23 is a circular through hole with a diameter slightly larger than the outer diameter of the connecting rod 31 in the adjustable elastic component 3, ensuring that the connecting rod 31 can pass through smoothly and move freely within it. The inner surface of the first hole 23 is precision machined to have low roughness, reducing the frictional resistance between it and the connecting rod 31. The position of the first hole 23 is optimized to ensure that the clamping force generated by the adjustable elastic component 3 can be evenly distributed on the clamping surface.

[0028] The lower clamping plate 2 and the upper clamping plate 1 are also provided with a second hole 24 through which the yarn-passing ceramic component passes. The position of the second hole 24 corresponds to the path of the yarn, and its size matches the shape of the yarn-passing ceramic component. The yarn-passing ceramic component is made of ceramic material, which has extremely high hardness and wear resistance, and can effectively resist long-term friction of the yarn.

[0029] The adjustable elastic component 3 includes a connecting rod 31, a thread 32, a nut 33, a step 34, a stop 35, and a spring 36. The connecting rod 31 is made of high-strength stainless steel, possessing sufficient strength and rigidity. A precision thread 32 is machined at one end of the connecting rod 31. The specification of the thread 32 is selected according to the actual force requirements, typically using a fine thread to ensure adjustment accuracy. A nut 33 is fitted at the thread 32, preferably an anti-loosening nut.

[0030] A step 34 is provided at the root of the thread 32. The diameter of the step 34 is larger than the inner diameter of the thread 32, forming an effective limiting surface. The function of the step 34 is to restrict the upper clamping plate 1 between the nut 33 and the step 34. This allows the upper clamping plate 1 to be lifted and separated from the lower clamping plate 2 when the connecting rod 31 is lifted, and the yarn passes between them. A stop 35 is provided at the other end of the connecting rod 31. The stop 35 and the connecting rod 31 can be integrally formed or fixed by welding, threaded connection, etc. The diameter of the stop 35 is larger than the diameter of the connecting rod 31, forming an effective limiting structure.

[0031] according to Figure 3 As shown, a threaded groove 311 is provided at the end of the connecting rod 31 near the stop block 35 for one end of the spring 36 to enter. The threaded groove 311 is adapted to one end of the spring 36. By rotating the spring 36, it gradually enters along the threaded path of the threaded groove 311, thereby adjusting the actual extendable length of the spring 36 and realizing the adjustment of the spring force of the spring 36.

[0032] according to Figure 4 As shown, in one embodiment, an annular groove 351 is provided at the end of the stop 35 near the spring 36. The width and depth of the annular groove 351 match the wire diameter of the spring 36, which can well accommodate the end of the spring 36 and ensure that the spring 36 remains stable during operation. The width of the annular groove 351 should be adapted to the wire diameter of the spring 36, preferably slightly smaller than the wire diameter of the spring 36, so that the two are interference fit. However, the spring 36 can be screwed into or out of the annular groove 351 by twisting to adjust the elastic force of the spring 36.

[0033] according to Figures 5-6As shown, in one embodiment, an upper adjusting ring 371 and a lower adjusting ring 372 are provided between the stop block 35 and the spring 36, for adjusting the overall thickness of the two after they are in contact by rotation. Both the upper adjusting ring 371 and the lower adjusting ring 372 are fitted onto the connecting rod 31 and can move along the axis of the connecting rod 31. The upper adjusting ring 371 and the lower adjusting ring 372 are made of the same material, typically aluminum alloy or engineering plastic, which have good wear resistance, low cost, and simple processing. Both the upper adjusting ring 371 and the lower adjusting ring 372 have a flat surface at one end and a stepped surface at the other end along the circumference. The stepped surface is specifically formed by multiple steps of different heights distributed around the circumference, creating multiple adjustment positions. The stepped surfaces of the upper adjusting ring 371 and the lower adjusting ring 372 are arranged opposite each other, and mutually cooperating positioning protrusions 373 and positioning grooves 374 are provided on the stepped surfaces. The number and position of the positioning protrusions 373 and positioning grooves 374 correspond to the number of steps on the stepped surface, ensuring a stable fit at each adjustment position. When the upper adjusting ring 371 or the lower adjusting ring 372 is rotated, the relative position of their stepped surfaces changes, and the total thickness after combination changes accordingly, thereby achieving fine adjustment of the preload of the spring 36.

[0034] Spring 36 is fitted onto connecting rod 31, located between nut 33 and stop block 35. Spring 36 is made of high-quality spring steel, heat-treated and surface-treated, and has good elasticity and fatigue resistance. The diameter of the contact point between spring 36 and lower clamping plate 2 is larger than the diameter of the first hole 23 in lower clamping plate 2 to prevent spring 36 from passing through the first hole 23 and causing elasticity failure.

[0035] according to Figures 1-2 As shown, a first protrusion 12 and a second protrusion 25 are respectively provided on the surfaces of the lower clamping plate 2 and the upper clamping plate 1, with the protruding surfaces of the first protrusion 12 and the second protrusion 25 facing each other. The specific shape of the first protrusion 12 and the second protrusion 25 is waist-shaped, that is, a long strip-shaped protrusion with semi-circular ends and a parallel side in the middle. The length direction of the waist-shaped protrusion is perpendicular to the yarn running direction. This arrangement can ensure sufficient clamping force and prevent the upper and lower clamping plates from bending.

[0036] The heights of the first protrusion 12 and the second protrusion 25 are optimized to form effective clamping points without excessively compressing the yarn. The tops of the protrusions feature an arc design, and the edges have a smooth transition to avoid cutting the yarn. The spacing and number of the waist-shaped protrusions are determined based on the length of the clamping plate and the clamping requirements, and are typically set in two pairs, evenly distributed on both sides of the clamping front (in the direction of yarn entry).

[0037] Reinforcing ribs 13 are also provided on the surfaces of the lower clamping plate 2 and the upper clamping plate 1. The arrangement direction of the reinforcing ribs 13 is consistent with the force direction of the clamping plates, and they are usually arranged in a crisscross grid pattern. The height and width of the reinforcing ribs 13 have been structurally optimized to minimize material usage while ensuring sufficient rigidity, thus achieving a lightweight design. The reinforcing ribs 13 and the clamping plate body are manufactured using an integral molding process, ensuring the integrity and strength of the structure.

[0038] Air blowing holes 26 for the cleaning component are provided on the lower clamping plate 2. The air blowing holes 26 are small-diameter through holes, typically located at the bottom of the lower clamping plate 2, with their outlet pointing towards the clamping area. The diameter and number of air blowing holes 26 are determined according to cleaning requirements, usually 1-2. The air blowing holes 26 can be connected to the nozzles of the cleaning component, allowing compressed air to be injected into the clamping area via timed or manual control to remove accumulated fly ash and dust.

[0039] Lips 14 are provided on both sides of the upper clamping plate 1. The lips 14 are upward-curving edges, and their height is slightly higher than the clamping surface plane. The function of the lips 14 is to prevent the yarn from contacting the upper clamping plate during operation and causing yarn wear. An inclined surface 15 is provided at the end of the upper clamping plate 1 away from the second hook 11, with the angle between the inclined surface 15 and the horizontal plane typically being 15-30 degrees. The inclined surface 15 makes it easier to guide the yarn between the upper and lower clamping plates, reducing the difficulty of the yarn threading operation.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A yarn clamping device with upper and lower clamping plates, comprising an upper clamping plate (1) and a lower clamping plate (2), wherein the lower clamping plate (2) has first hooks (21) at both ends for connecting to the main body of the yarn clamping device, and the lower clamping plate (2) also has a slot (22) for movably connecting with the upper clamping plate (1), and the upper clamping plate (1) has a second hook (11) at one end that matches the slot (22), characterized in that, The lower clamping plate (2) and the upper clamping plate (1) are provided with a first hole (23) through which the adjustable elastic component (3) passes. The lower clamping plate (2) and the upper clamping plate (1) are also provided with a second hole (24) through which the yarn-woven ceramic part passes. The adjustable elastic component (3) includes a connecting rod (31). One end of the connecting rod (31) is provided with a thread (32). A nut (33) is provided at the thread (32). A step (34) is provided at the thread (32). A stop block (35) is provided at the other end of the connecting rod (31). A spring (36) is fitted on the connecting rod (31).

2. The upper and lower clamping plates of a yarn clamping device according to claim 1, characterized in that, The connecting rod (31) has a threaded groove (311) near the stop (35) for the spring (36) to enter.

3. The upper and lower clamping plates of a yarn clamping device according to claim 1, characterized in that, The stop (35) has an annular groove (351) at the end near the spring (36).

4. The upper and lower clamping plates of a yarn clamping device according to claim 1, characterized in that, An upper adjusting ring (371) and a lower adjusting ring (372) are provided between the stop block (35) and the spring (36) for adjusting the distance between them by rotation. The upper adjusting ring (371) and the lower adjusting ring (372) are both fitted on the connecting rod (31). The upper adjusting ring (371) and the lower adjusting ring (372) are both stepped surfaces with one end being a plane and the other end being set along the circumferential direction. The stepped surfaces of the upper adjusting ring (371) and the lower adjusting ring (372) are arranged opposite to each other, and the stepped surfaces are provided with mutually cooperating positioning protrusions (373) and positioning grooves (374).

5. The upper and lower clamping plates of a yarn clamping device according to claim 1, characterized in that, The surfaces of the lower clamping plate (2) and the upper clamping plate (1) are respectively provided with a first protrusion (12) and a second protrusion (25), and the protruding surfaces of the first protrusion (12) and the second protrusion (25) are arranged opposite to each other.

6. The upper and lower clamping plates of a yarn clamping device according to claim 5, characterized in that, The first protrusion (12) and the second protrusion (25) are waist-shaped protrusions.

7. The upper and lower clamping plates of a yarn clamping device according to claim 1, characterized in that, The surfaces of the lower clamping plate (2) and the upper clamping plate (1) are also provided with reinforcing ribs (13).

8. The upper and lower clamping plates of a yarn clamping device according to claim 1, characterized in that, The lower clamping plate (2) is provided with an air blowing hole (26) for the cleaning component to blow air.

9. The upper and lower clamping plates of a yarn clamping device according to claim 1, characterized in that, The upper clamping plate (1) has lips (14) on both sides, and an inclined surface (15) is provided at the end away from the second hook (11) at an upward angle.

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