Polishing pad and polishing disc suitable for polishing operation of mechanical arm

Abstract

The utility model discloses a polishing pad suitable for polishing operation of a mechanical arm and a corresponding polishing disc. The polishing pad comprises a polishing layer, a longitudinal reinforcing layer, a buffer layer, a transverse reinforcing layer and a connecting layer which are bonded in sequence. The longitudinal reinforcing layer can be made of nylon flannelette, and the transverse reinforcing layer can be made of blended cloth of glass fibers and nylon. The high-temperature-resistant and high-pressure-resistant composite joint has high pressure resistance, shear resistance and high-temperature resistance, solves the problems of interlayer stripping, shear deformation or connection failure caused by fixed and dynamic composite loads, and has longer service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automatic surface treatment, and particularly relates to a multilayer composite structure polishing pad and polishing disc suitable for polishing operation of a mechanical arm, and is especially suitable for the automatic polishing process of high-brightness paint surfaces and composite material surfaces. BACKGROUND

[0002] With the development of automation technology, mechanical hands or mechanical arms are increasingly widely used in production workshops of various products. For example, for a manufacturer of automobiles or automobile parts, a mechanical arm is used to process, assemble, surface treat and detect various parts, and even some workshops have realized unmanned operation. This not only improves production efficiency, but also reduces cost and is conducive to the control of product quality.

[0003] However, for surface polishing operation, the use of a mechanical arm to operate still brings some problems. For example, when polishing the paint surface of an automobile, due to the irregular shape of the surface parts of the automobile, the mechanical arm sometimes cannot flexibly control the position, angle and force point of the polishing disc like a human hand.

[0004] For example, at the edge or turning point of an automobile part, a human hand can flexibly adjust the contact angle and force point of the polishing pad with the surface when polishing, so as to ensure effective treatment of all surfaces that need to be polished. In addition, due to the sensitive sensing ability of a human hand, the situation of excessive force or uneven force will not occur.

[0005] Figure 1 And Figure 2 is a schematic view of the structure of a traditional polishing disc, wherein Figure 1 is a whole structure view, Figure 2 is a split view of the base and the polishing pad. As shown in Figure 1 one end of the polishing disc can be connected with the output shaft of the motor to perform rotary motion under the driving of the motor, and the other end of the polishing disc is the end that contacts the target object that needs to be polished, and the end is composed of flexible materials such as sponges.

[0006] Figure 2The polishing pad is shown to consist of two parts: a polishing pad 1 and a base 2. The base 2 includes a support 21, a buffer 23, and a connecting part 22. The support 21 is typically made of a composite of metal and rubber and is used to connect to the motor output shaft, while also supporting the buffer 23 and the connecting part 22. The buffer 23 is typically made of high-density sponge, and the connecting part 22 serves as the component connecting to the polishing pad 1. A conventional polishing pad 1 includes a directly bonded polishing layer 11 and a connecting layer 12. The polishing layer 11 is used for contact and friction with the surface of the target object, while the connecting layer 12 is used to connect to the base 2 of the polishing pad. The connecting part 22 and the connecting layer 12 are typically made of paired hook and loop fasteners (Velcro) for easy replacement of the polishing pad 1.

[0007] When using robotic arms for polishing, the arms execute predetermined actions according to pre-programmed instructions. Unlike humans, they cannot perceive the polishing force and effect in real time. Consequently, when the polishing pad is located at the edge or bend of a part, the robotic arm often cannot make flexible adjustments to its position and angle, making traditional polishing pads easily torn and damaged. Therefore, given the current limitations in precisely controlling robotic arms, improving the durability of polishing pads in robotic polishing operations has become a pressing issue for the industry. Summary of the Invention

[0008] (a) Technical problems to be solved

[0009] This invention aims to solve the problems of interlayer peeling, shear deformation, or connection failure of the polishing pad caused by dynamic composite load during the polishing process of a robotic arm.

[0010] (II) Technical Solution

[0011] To address the aforementioned technical problems, this utility model proposes a polishing pad suitable for robotic arm polishing operations. The pad is installed at the front end of the robotic arm and polishes the surface of a target object through the operation of the robotic arm. The polishing pad comprises a polishing layer, a longitudinal reinforcing layer, a buffer layer, a transverse reinforcing layer, and a connecting layer, which are sequentially bonded together. The polishing layer is used for contact and friction with the surface of the target object. The longitudinal reinforcing layer (13) is used to enhance the longitudinal compressive strength of the polishing pad. The buffer layer is used to absorb the instantaneous impact from the robotic arm and the target object on the polishing pad. The transverse reinforcing layer is used to enhance the shear strength of the polishing pad along the direction parallel to its surface. The connecting layer is used to connect to the base of the polishing disc.

[0012] According to a preferred embodiment of the present invention, the longitudinal reinforcing layer has an areal density of 200–400 g / m³. 2 The fabric composition between them.

[0013] According to a preferred embodiment of the present invention, the fabric is at least one of fleece, brushed cotton, bamboo fiber fabric, and linen blend.

[0014] According to a preferred embodiment of the present invention, the fleece is made of nylon, and the fiber diameter of the nylon is 20-30 μm.

[0015] According to a preferred embodiment of the present invention, the transverse reinforcing layer is composed of a blend of glass fiber and nylon.

[0016] According to a preferred embodiment of the present invention, the glass fiber in the blended fabric has a weight percentage of 30-70%, a diameter of 80-120 μm, and a fiber diameter of nylon of 20-30 μm.

[0017] According to a preferred embodiment of the present invention, both the buffer layer and the polishing layer are sponges.

[0018] According to a preferred embodiment of the present invention, the connecting layer is a hook and loop fastener.

[0019] Another aspect of this utility model provides a polishing disc suitable for robotic arm polishing operations, comprising a base and the aforementioned polishing pad suitable for robotic arm polishing operations connected to the base.

[0020] (III) Beneficial Effects

[0021] The polishing pad and corresponding polishing disc of this invention, which have a multi-layer composite structure, have high compressive strength, shear resistance and high temperature resistance, and have a longer service life, making them particularly suitable for use in robotic arm polishing operations. Attached Figure Description

[0022] Figure 1 and Figure 2 This is a schematic diagram of the structure of a traditional polishing disc, in which... Figure 1 This is a diagram of the overall structure. Figure 2 This is a schematic diagram showing the separate components of the base and the polishing pad.

[0023] Figure 3 This is a schematic diagram of the structure of a polishing disc according to one embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the overall structure of the polishing pad according to one embodiment of the present invention.

[0025] Figure 5 This is an exploded view of the composite layered structure of a polishing pad according to an embodiment of the present invention. Detailed Implementation

[0026] To address the problem that existing polishing pads are unsuitable for polishing operations by robotic arms, this invention proposes a more durable polishing pad that will not suffer from problems such as interlayer delamination, shear deformation, or connection failure due to excessive dynamic composite loads that may occur during polishing operations by robotic arms.

[0027] Specifically, this invention proposes a polishing pad with a multi-layered composite structure, which is particularly suitable for mounting on the front end of a robotic arm and polishing the surface of a target object through the operation of the robotic arm. Compared with the prior art, this multi-layered composite structure adds a longitudinal reinforcing layer, a transverse reinforcing layer, and a buffer layer. The buffer layer is located between the longitudinal and transverse reinforcing layers.

[0028] The longitudinal reinforcing layer is mainly used to enhance the longitudinal compressive strength of the polishing pad. Since polishing operations are performed using robotic arms, the longitudinal pressure applied to the polishing pad by the robotic arm is often quite high. To prevent the overall structure of the polishing pad from deforming under greater pressure and to enhance its durability, this invention adds a longitudinal reinforcing layer to the rear side of the polishing layer (the side furthest from the target object being polished) of the traditional polishing pad. In this invention, longitudinal refers to the direction perpendicular to the polishing plane of the polishing pad, typically the same as or at a small angle to the axis of rotation of the motor.

[0029] In selecting materials for the longitudinal reinforcing layer, this invention considers materials that have small deformation capacity in the longitudinal direction but a certain degree of elasticity in the circumferential direction (polishing surface direction). This enhances its compressive strength without compromising its circumferential softness and elasticity, thus maintaining the polishing effect.

[0030] In this invention, a slightly thicker fabric is preferred to form the longitudinal reinforcing layer because the fabric is relatively soft and elastic in its surface direction, but denser in the direction perpendicular to the surface, thus possessing a certain degree of compressive strength. Specifically, according to experiments conducted by the research team of this invention, a surface density of 200–400 g / m³ is suitable. 2 It is more suitable for the fabrics to form a longitudinal reinforcing layer. The fabric can be one of the following: fleece, brushed cotton, bamboo fiber, or linen blend, or a combination of two or more of them.

[0031] As the most preferred material, a nylon fleece can be used, with the nylon fibers preferably having a diameter of 20–30 μm. This is the preferred material for the longitudinal reinforcement layer of a standard polishing pad used for polishing automotive paint surfaces.

[0032] In addition to adding a longitudinal reinforcing layer to the polishing pad, this invention also includes a transverse reinforcing layer. This transverse reinforcing layer primarily enhances the shear strength of the polishing pad along a direction parallel to its surface. It should be noted that "transverse" here refers to the direction perpendicular to its longitudinal direction, which is parallel to the direction of the polishing surface where the polishing heat occurs.

[0033] A transverse reinforcing layer is located on the back of the connecting layer. Its main purpose is to prevent the polishing layer from being torn due to excessive instantaneous shear force on the polishing pad in the transverse direction caused by the irregular shape of the target object's edges and corners during polishing operations. This invention specifically proposes using a blend of glass fiber and woven fabric to form the transverse reinforcing layer. The woven fabric is preferably nylon, which has a certain degree of toughness in the transverse direction, while glass fiber is not easily deformed. The blend exhibits good compressive strength in all directions, thus enabling the polishing pad to have excellent shear resistance.

[0034] Through practical verification, it has been found that a glass fiber weight percentage of 30-70% in the blended fabric is a suitable choice, and the glass fiber diameter is preferably 80-120 μm, while the nylon fiber diameter is preferably 20-30 μm.

[0035] Furthermore, this invention incorporates a buffer layer between the longitudinal and transverse reinforcing layers to absorb instantaneous impacts from the robotic arm and the target object onto the polishing pad. The buffer layer can be made of high-density sponge or a similar shock-absorbing material.

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0037] Figure 3 This is a schematic diagram of the structure of a polishing disc according to one embodiment of this utility model. Figure 3 As shown, this polishing disc is similar to a traditional polishing disc, but it uses a different polishing pad. Specifically, the polishing disc also includes two parts: a polishing pad and a base. The base can also include a support, a buffer, and a connecting part, with the connecting part serving as the component that connects to the polishing pad.

[0038] Figure 4 This is a schematic diagram of the overall structure of a polishing pad according to one embodiment of the present invention. Figure 4 As shown, its overall shape is similar to that of a traditional polishing pad, but it has a multi-layered, complex structure. Because it has similar specifications to traditional polishing pads, it can directly replace them without requiring any adaptation to the polishing pad's base.

[0039] Figure 5This is an exploded view of the composite layered structure of a polishing pad according to an embodiment of this utility model. Figure 5 As shown, the polishing heat in this embodiment consists of, from bottom to top, an adhesive polishing layer 11, a longitudinal reinforcing layer 13, a buffer layer 14, a transverse reinforcing layer 15, and a connecting layer 12. The polishing layer 11 is used to contact and rub against the car paint surface; combined with the use of polishing fluid, it can polish the car paint. The polishing layer is made of sponge.

[0040] In this embodiment, the reinforcing layer 13 is made of nylon fleece. The nylon is preferably Nylon 6 (PA6) or Nylon 66 (polyhexamethylene adipamide, PA66). Nylon 66 has a tensile strength of 80–90 MPa and an elastic modulus of approximately 3 GPa, exhibiting high rigidity and excellent creep resistance. In this embodiment, the nylon fleece has fibers with a diameter between 20 and 30 μm and an areal density between 200 and 400 g / m³. 2 .

[0041] In other embodiments, brushed cotton fabric, bamboo fiber fabric, linen blend fabric, etc. with similar properties can be used instead of nylon fleece.

[0042] In this embodiment, the buffer layer 14 is made of high-density sponge. The density of high-density sponge is generally 30-80 kg / m³. 3 The porosity is between 80% and 95%, and the longitudinal compressive strength is preferably greater than 15 MPa.

[0043] In this embodiment, the transverse reinforcing layer 15 is a blended fabric composed of glass fiber and nylon, each accounting for approximately 50% by weight. The diameter of the glass fiber is 80-120 μm, and the diameter of the nylon is 20-30 μm. Its tensile strength can reach over 200 MPa. The use of glass fiber significantly improves the tensile and compressive strength of nylon, giving this blended fabric dimensional stability. The low coefficient of thermal expansion of glass fiber suppresses the shrinkage and deformation of nylon, ensuring that the material maintains its precise shape under changes in temperature and humidity. At the same time, the high melting point of glass fiber (approximately 1200°C) allows the blended fabric to maintain structural stability even under high-temperature environments (short-term tolerance to 180-200°C), avoiding softening or thermal decomposition, and preventing the heat generated during prolonged use of the polishing pad from damaging its structural stability.

[0044] Furthermore, in this embodiment, the connecting layer 12 is connected to the base of the polishing pad, and the connecting part of the base and the connecting layer 12 are made of a pair of hook and loop fasteners (Velcro), which facilitates the replacement of the polishing pad 1.

[0045] Through the above-described solution, this invention strengthens the polishing pad both longitudinally and laterally. This multi-layered composite structure offers superior performance compared to traditional polishing pads, enhancing its overall compressive strength, shear resistance, and high-temperature resistance, while also extending its service life. It is particularly suitable for robotic arm polishing operations. Problems such as interlayer delamination, shear deformation, or connection failure caused by dynamic composite loads are also resolved.

[0046] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A polishing pad suitable for polishing work by a robot arm, characterized in that: it is installed at the front end of the robot arm and is used to polish the surface of a target object by the operation of the robot arm; it comprises a polishing layer (11), a longitudinal reinforcing layer (13), a buffer layer (14), a transverse reinforcing layer (15) and a connecting layer (12) which are bonded in sequence; the polishing layer (11) is used to contact and rub against the surface of the target object; the longitudinal reinforcing layer (13) is used to strengthen the longitudinal compressive strength of the polishing pad (1); the buffer layer (14) is used to absorb the instantaneous impact of the polishing pad from the robot arm and the target object; the transverse reinforcing layer (15) is used to strengthen the shear strength of the polishing pad (1) along the direction parallel to its surface; and the connecting layer (12) is used to connect with the base of the polishing disc. The fabric is at least one of flannelette, brushed cotton, bamboo fiber cloth and linen blended cloth. The material of the flannelette is nylon, and the fiber diameter of the nylon is 20-30 μm. The transverse reinforcing layer (15) is composed of a blended cloth of glass fiber and nylon. The weight percentage of the glass fiber in the blended cloth is 30-70%. The diameter of the glass fiber is 80-120 μm, and the fiber diameter of the nylon is 20-30 μm. The buffer layer and the polishing layer are both sponges. The connecting layer is a Velcro strip.

2. The polishing pad suitable for a polishing operation by a robot arm according to claim 1, wherein Said longitudinal reinforcement layer (13) is constituted by a fabric having an areal density comprised between 200 and 400 g / m 2 .

3. The polishing pad suitable for a polishing operation by a robot arm according to claim 2, wherein The polishing pad is the polishing pad suitable for polishing work by a robot arm as claimed in any one of claims 1 to 7.

4. The polishing pad suitable for a polishing operation by a robot arm according to claim 3, wherein ​ 5. The polishing pad suitable for polishing operations by a robot arm according to claim 1, wherein, ​ 6. The polishing pad suitable for polishing operations by a robot arm according to claim 5, wherein, ​ 7. The polishing pad suitable for polishing operations by a robot arm according to claim 6, wherein, ​ 8. The polishing pad suitable for polishing operations by a robot arm according to any one of claims 1 to 7, wherein, ​ 9. The polishing pad suitable for polishing operations by a robot arm according to any one of claims 1 to 7, wherein, ​ 10. A polishing pad suitable for use in a robotic polishing operation, comprising a base and a polishing pad attached to the base, wherein the polishing pad comprises a plurality of layers, and wherein at least one of the layers is a layer of a material having a coefficient of friction of at least 0.

5. ​

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