Ring cutting equipment for polyurethane polishing disk

Abstract

The utility model relates to ring cutting equipment for a polyurethane polishing disk, which comprises a rack, a first telescopic cylinder is vertically arranged at the top of the rack, a sliding block in sliding connection with the rack is fixed at the lifting end of the first telescopic cylinder, and a base opposite to the sliding block is fixed at the bottom of the rack; the cutting ring assembly comprises an outer cutting ring and an inner cutting ring, the outer cutting ring is in an inverted cup shape, the top of the outer cutting ring is fixed to the bottom face of the sliding block, and the inner cutting ring is in a column shape and is arranged in the outer cutting ring; the cutting bearing seat is fixed to the base and located under the cutting ring assembly, and a containing groove is formed in the cutting bearing seat; the circular cutting device has the advantages that the outer cutting ring and the inner cutting ring are driven to descend to cut off redundant hook-and-loop fasteners and polyurethane on a semi-finished polyurethane polishing disc through lifting of the air cylinder, automatic circular cutting operation is achieved, compared with manual operation, efficiency can be improved by more than 6 times, namely, one semi-finished product can be changed into a finished product within 30 seconds on average, and meanwhile labor cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic tool production equipment, and in particular to a circumferential cutting device for polyurethane polishing discs. Background Technology

[0002] A pneumatic polisher is a tool that uses compressed air as a power source and is widely used for polishing and grinding the surfaces of various materials such as metal, wood, and plastic. A polyurethane polishing disc, also known as a pneumatic suction cup, is a component installed on the rotating end of the pneumatic polisher. Figure 1 and Figure 2 As shown, existing polyurethane polishing discs include a base, a polyurethane layer, a hook and loop fastener layer, and a polishing or grinding layer. The base is made of plastic or metal, with a connector (a bolt protruding from the back of the base) on the back for fixing to the rotating end of a pneumatic polisher. The polyurethane layer is formed on the front of the base through an injection molding and foaming process. A hook and loop fastener layer is adhered to the surface of the polyurethane layer to secure the polishing or grinding layer (such as sandpaper, polishing cloth, etc.). The polyurethane polishing disc has multiple through holes for heat dissipation, allowing for exhaust, optimizing airflow, and improving heat dissipation.

[0003] After ester injection and foaming, it forms as follows: Figure 3 The semi-finished product shown has a hook and loop layer with a much larger area than the base. The base has pre-drilled ventilation holes at the bottom, but the foamed polyurethane layer and the attached hook and loop layer lack ventilation holes. Furthermore, the foamed polyurethane also blocks the pre-drilled ventilation holes at the base. At this point, the worker needs to use scissors to cut the hook and loop to fit the edges of the base. Simultaneously, a thin-tube ring cutter is used to remove the polyurethane and hook and loop at the locations of the pre-drilled ventilation holes, creating through holes corresponding to the pre-drilled ventilation holes on the base, thus forming the finished polyurethane polishing disc.

[0004] However, the above processes are all done manually, which is extremely inefficient. A skilled worker needs an average of 3 minutes to turn a semi-finished product into a finished product. Based on this, this case is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a circumferential cutting device for polyurethane polishing discs, which can significantly improve the manufacturing efficiency and quality of polyurethane polishing discs while reducing labor costs.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A circumferential cutting device for polyurethane polishing discs, comprising:

[0008] The frame has a vertically arranged first telescopic cylinder at its top, and a slider that is slidably connected to the frame is fixed at the lifting end of the first telescopic cylinder. The bottom of the frame has a base that is opposite to the slider.

[0009] The ring cutter assembly includes an outer ring cutter and an inner ring cutter. The outer ring cutter is an inverted cup shape with an annular cutting edge at its bottom end, the diameter of which is the same as the diameter of the finished polyurethane polishing disc. Its top is fixed to the bottom surface of the slider. The inner ring cutter is tubular and is disposed inside the outer ring cutter. Its top end is fixed to the inner wall of the top surface of the outer ring cutter, and its bottom end is an annular cutting edge that protrudes downward from the bottom surface of the outer ring cutter. The inner ring cutter can pass through the heat dissipation hole reserved at the base of the polyurethane polishing disc. The distance from the bottom surface of the inner ring cutter to the bottom surface of the outer ring cutter is equal to the height of the polyurethane polishing disc.

[0010] The cutting support is fixed on the base and located directly below the ring cutter assembly. The cutting support has a mounting groove that matches the polyurethane polishing disc base. The bottom center of the mounting groove has a receiving groove that matches the polyurethane polishing disc connector.

[0011] Furthermore, the bottom surface of the mounting groove is provided with protrusions that correspond one-to-one with the inner ring cutter. The outer diameter of the protrusion is smaller than the inner diameter of the inner ring cutter, and the height of the protrusion is greater than the thickness of the polyurethane polishing disc base.

[0012] The top surface of the outer ring cutter is provided with channels that correspond one-to-one with the inner ring cutter. A cleaning nozzle is installed on the top surface of the outer ring cutter. The cleaning nozzle enters the inner ring cutter through the channel and the air jet direction is vertically downward.

[0013] Furthermore, the frame is equipped with several cleaning nozzles, which blow air downwards at an angle and the air blowing direction is aimed at the placement groove.

[0014] Furthermore, it includes a horizontally placed second telescopic cylinder, the telescopic end of which is fixed with a finger cylinder, which is located on one side of the placement groove and is used to grip the cut Velcro.

[0015] Furthermore, a blade holder is fixed to the outer wall of the outer ring cutter, and a slit-opening blade is provided at the bottom of the blade holder. The cutting edge of the slit-opening blade is flush with the bottom surface of the outer ring cutter. The blade holder and the second telescopic cylinder are located on both sides of the cutting seat.

[0016] Furthermore, the outer ring cutter is provided with a pressure rod, which is fixed to the center of the inner wall of the top surface of the outer ring cutter, and its bottom surface is flush with the bottom surface of the outer ring cutter.

[0017] Furthermore, the outer ring cutter includes an outer ring cutter seat and an outer ring cutter blade, which are detachably and fixedly connected.

[0018] Furthermore, the outer ring blade holder and the outer ring blade are connected by threads, and vertical grooves are arranged on the outer wall of the outer ring blade.

[0019] Furthermore, the channel extends into the inner cavity of the outer ring cutter to form an external threaded opening, and the top of the inner ring cutter is provided with an internal thread that mates with the external threaded opening.

[0020] Furthermore, the air nozzle for cleaning the hole includes an air nozzle body and a mounting ring integrally formed with the air nozzle body. The mounting ring has a mounting hole and a screw. The top surface of the outer ring cutter has a screw hole that mates with the screw.

[0021] The advantages of this utility model are:

[0022] 1. By lifting the cylinder, the outer ring cutter and the inner ring cutter are driven to descend and remove the excess Velcro and polyurethane on the semi-finished polyurethane polishing disc, realizing automated ring cutting operation. Compared with manual operation, the efficiency can be increased by more than 6 times, that is, an average of 30 seconds can turn a semi-finished product into a finished product, while also reducing labor costs.

[0023] 2. The ring cutter assembly consists of an outer ring cutter and an inner ring cutter. It can simultaneously remove excess Velcro and polyurethane on the semi-finished polyurethane polishing disc. It also adds an air nozzle to blow out the polyurethane stuck in the inner ring cutter. In addition, the cutting edge of the outer ring cutter can be disassembled and replaced, and the inner ring cutter is also detachable, which can be replaced individually, greatly reducing maintenance costs.

[0024] 3. The equipment simulates manual operation by adding a clamping device for picking up the cut hook and loop fasteners. When the ring cutter assembly descends and the excess hook and loop fasteners are cut off, the clamping device picks up the cut hook and loop fasteners and pulls them out, eliminating the need for manual cleaning of the cutting seat surface, improving efficiency and increasing operational safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a finished polyurethane polishing disc in the background art;

[0026] Figure 2 for Figure 1 An explosion diagram;

[0027] Figure 3 This is a schematic diagram of the structure of a polyurethane polishing disc semi-finished product in the background art;

[0028] Figure 4 This is a schematic diagram of the structure of the circumferential cutting device in the embodiment;

[0029] Figure 5 for Figure 4 Enlarged diagram of part A in the diagram;

[0030] Figure 6 This is a top view schematic diagram of the ring cutter assembly in the embodiment;

[0031] Figure 7 This is a schematic diagram of the cutter holder and the slit cutting blade in the ring cutter assembly of an embodiment;

[0032] Figure 8 for Figure 4 Enlarged schematic diagram of part B in the diagram;

[0033] Figure 9 This is a schematic diagram of a polyurethane polishing disc semi-finished product placed on a cutting support in an embodiment;

[0034] Figure 10 This is a schematic diagram showing the state of the ring blade assembly descending to remove excess polyurethane and Velcro in the embodiment;

[0035] Figure 11 for Figure 10 This is a diagram illustrating how the finger cylinder extends to grab excess Velcro in this state.

[0036] Figure 12 This is a schematic diagram showing the state of the polyurethane and Velcro plug removed from the inner ring cutter after the circumferential cutting is completed and the slider rises, as described in the embodiment.

[0037] Figure 13 This is a schematic diagram of the Velcro strip that was cut off by the outer ring blade in the embodiment.

[0038] Label Explanation

[0039] 1. Frame; 2. Ring cutter assembly; 201. Outer ring cutter; 2011. Outer ring cutter holder; 2012. Outer ring cutter blade; 202. Inner ring cutter; 203. Cleaning nozzle; 2031. Mounting ring; 2032. Screw; 204. Cutter holder; 205. Slit cutting blade; 206. Pressure bar; 207. Vertical groove; 208. External threaded end; 3. First telescopic cylinder; 4. Slider; 5. Base; 6. Cutting support; 601. Mounting groove; 602. Receiving groove; 603. Protrusion; 7. Cleaning nozzle; 801. Second telescopic cylinder; 802. Finger cylinder; 9. Polyurethane polishing disc; 901. Base; 902. Polyurethane layer; 903. Velcro layer; 904. Through hole; 905. Connector. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the embodiments. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" etc. indicated by the accompanying drawings are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0041] This embodiment proposes a circumferential cutting device for polyurethane polishing discs, such as... Figures 4 to 9As shown, the machine includes a frame 1, a ring cutter assembly 2, and a cutting support 6. The top of the frame 1 is provided with a vertically arranged first telescopic cylinder 3, and the lifting end of the first telescopic cylinder 3 is fixed with a slider 4 that is slidably connected to the frame 1. The bottom of the frame 1 is fixed with a base 5 opposite to the slider 4.

[0042] like Figure 5 and Figure 6 As shown, the ring cutter assembly 2 includes an outer ring cutter 201 and an inner ring cutter 202. The outer ring cutter 201 is an inverted cup shape, with an annular cutting edge at its bottom end and the diameter of the cutting edge being the same as the diameter of the finished polyurethane polishing disc 9. Its top is fixed to the bottom surface of the slider 4. The inner ring cutter 202 is a thin tube shape and is disposed inside the outer ring cutter 201. Its top end is fixed to the inner wall of the top surface of the outer ring cutter 201, and its bottom end is an annular cutting edge that protrudes downward from the bottom surface of the outer ring cutter 201. The inner ring cutter 202 can just pass through the heat dissipation hole reserved at the base 901 of the polyurethane polishing disc 9. The distance from the bottom surface of the inner ring cutter 202 to the bottom surface of the outer ring cutter 201 is equal to the height of the polyurethane polishing disc 9. According to Figure 1 The number of through holes 904 in the finished polyurethane polishing disc 9 is as follows: In this embodiment, four inner ring cutters 202 are provided, and the four inner ring cutters 202 are arranged in a ring inside the outer ring seat.

[0043] The cutting support 6 is fixed on the base 5 and located directly below the ring cutter assembly 2. The cutting support 6 has a mounting groove 601 that matches the base 901 of the polyurethane polishing disc 9. The bottom center of the mounting groove 601 has a receiving groove 602 that matches the connector 905 of the polyurethane polishing disc 9. For example... Figure 8 As shown, the bottom surface of the mounting groove 601 is provided with protrusions 603 corresponding to the inner ring cutters 202. The outer diameter of the protrusions 603 is smaller than the inner diameter of the inner ring cutters 202, and the height of the protrusions 603 is greater than the thickness of the polyurethane polishing disc 9 base 901. The top surface of the outer ring cutter 201 is provided with channels corresponding to the inner ring cutters 202. A cleaning nozzle 203 is installed on the top surface of the outer ring cutter 201. The cleaning nozzle 203 enters the inner ring cutter 202 through the channels and the air jet direction is vertically downward.

[0044] like Figure 9As shown, during operation, the worker places the semi-finished polyurethane polishing disc 9 into the placement groove 601. The connector 905 on the base 901 can just enter the receiving groove 602, limiting the base 901. At the same time, the protrusion 603 is aligned with the pre-reserved heat dissipation hole on the base 901, but at this time the hole is blocked by polyurethane, and the protrusion 603 cannot enter. After placement, the worker operates the first telescopic cylinder 3 to descend, bringing the ring cutter assembly 2 close to the semi-finished polyurethane polishing disc 9. During the descent, the cutting edge of the outer ring cutter 201 cuts around the edge of the base 901, separating the Velcro outside the edge of the base 901 from the Velcro inside the edge of the base 901. The inner ring cutter 202 passes through the Velcro layer 903, the polyurethane layer 902, and the pre-reserved heat dissipation hole on the base 901 in sequence until it reaches the bottom surface of the placement groove 601. Figure 10 As shown in the enlarged view, at this point, the protrusion 603 enters the inner ring cutter 202. During the entry process, the protrusion 603 pushes the polyurethane and Velcro cut by the inner ring cutter 202 into the cavity of the inner ring cutter 202. After the ring cutting is completed, the worker operates the first telescopic cylinder 3 to rise, as shown in the enlarged view. Figure 12 As described above, the polyurethane polishing disc semi-finished product completes the circumferential cutting operation, and the cavity of the inner ring cutter 202 is filled with the cut polyurethane and Velcro. At this time, the air pump is started, and the cleaning nozzle 203 sprays high-pressure air to blow out the polyurethane and Velcro filled in the cavity of the inner ring cutter 202.

[0045] Preferably, the frame 1 is equipped with several cleaning nozzles 7, which blow air downwards at an angle and are directed towards the placement groove 601. When the polyurethane and Velcro plugged into the cavity of the inner ring cutter 202 are blown out, they will fall into or near the placement groove 601. At this time, the air pump is activated, causing the cleaning nozzles 7 to spray high-pressure air, which blows the polyurethane and Velcro in or near the placement groove 601 to the ground.

[0046] refer to Figure 5 The outer ring cutter 201 has a pressure rod 206 inside, which is fixed to the center of the inner wall of the top surface of the outer ring cutter 201, and its bottom surface is flush with the bottom surface of the outer ring cutter 201. During the circumferential cutting process, the inner ring cutter 202 first contacts the polishing disc to perform circumferential cutting. Due to the elasticity of the polyurethane material, when the four inner ring cutters 202 arranged in a ring are inserted into the polishing disc at the same time, the central area will bulge upward, causing the Velcro layer 903 to shrink inward. In this embodiment, the bottom of the pressure rod 206 is on the same plane as the outer ring cutter 201. The pressure rod 206 is used to press down to press down the bulging part in the center of the disc surface, ensuring that after the outer ring cutter 201 performs circumferential cutting, the edge of the Velcro is aligned with the edge of the base 901.

[0047] After the circumferential cutting, the Velcro cut by the outer ring blade 201 needs to be removed manually. Preferably, this embodiment includes a clamping device. Figure 4As shown, the gripping device includes a horizontally placed second telescopic cylinder 801. A finger cylinder 802 is fixed to the telescopic end of the second telescopic cylinder 801. The finger cylinder 802 is located on one side of the mounting groove 601 and is used to grip the cut Velcro. Figure 11 As shown, when the ring blade assembly 2 descends to perform a ring cut, the finger cylinder 802 extends synchronously, clamping the edge of the Velcro. After the cut is completed, it retracts and releases, causing the clamped Velcro to fall to the ground. However, there is a problem here: the Velcro cut by the outer ring blade 201 forms a closed ring. If the finger cylinder 802 tries to remove the Velcro before the ring blade assembly 2 rises, there will be some resistance (the cut Velcro will remain on the ring blade assembly 2). Preferably, as... Figures 5 to 7 As shown, in this embodiment, a blade holder 204 is fixed to the outer wall of the outer ring cutter 201. A slit-opening blade 205 is provided at the bottom of the blade holder 204. The cutting edge of the slit-opening blade 205 is flush with the bottom surface of the outer ring cutter 201. The blade holder 204 and the second telescopic cylinder 801 are located on opposite sides of the cutting support 6. By providing the slit-opening blade 205, when the ring cutter assembly 2 descends, the slit-opening blade 205 cuts into the Velcro cut by the outer ring cutter 201, forming a... Figure 13 The notch shown allows the Velcro to be removed when the finger cylinder 802 is not in the ring cutter assembly 2.

[0048] To facilitate the replacement of the outer ring blade and the inner ring blade 202, ensure the sharpness of the ring cut, and reduce maintenance costs, the outer ring blade 201 in this embodiment includes an outer ring blade seat 2011 and an outer ring blade 2012. The outer ring blade seat 2011 and the outer ring blade 2012 are connected by threads, and vertical grooves 207 are arranged on the outer wall of the outer ring blade 2012. The vertical grooves 207 are used to enhance the friction when gripping, making it easier for the user to screw the outer ring blade 2012 (the outer ring blade 201 has a larger diameter, and the ring blade assembly 2 is made of stainless steel. If the surface is relatively smooth, it is not easy to screw it. The inner ring blade 202 has a smaller diameter, making it easier for the user to apply force and screw it. Therefore, it is not necessary to add vertical grooves 207). Meanwhile, the channel on the outer ring cutter 201 extends into the inner cavity of the outer ring cutter 201 to form an external threaded opening 208, and the top of the inner ring cutter 202 is provided with an internal thread that mates with the external threaded opening 208, so as to realize the detachable fixed connection of the inner ring cutter 202.

[0049] In addition, the cleaning nozzle 203 includes a nozzle body and a mounting ring 2031 integrally formed with the nozzle body. The mounting ring 2031 has a mounting hole and a screw 2032. The top surface of the outer ring cutter 201 has a screw hole that mates with the screw, thereby realizing the installation and fixation of the cleaning nozzle 203.

[0050] The above embodiments are only used to explain the concept of this utility model, and are not intended to limit the protection of this utility model. Any non-substantial modifications made to this utility model using this concept should fall within the protection scope of this utility model.

Claims

1. A circumferential cutting device for polyurethane polishing discs, characterized in that, include: The frame has a vertically arranged first telescopic cylinder at its top, and a slider that is slidably connected to the frame is fixed at the lifting end of the first telescopic cylinder. The bottom of the frame has a base that is opposite to the slider. The ring cutter assembly includes an outer ring cutter and an inner ring cutter. The outer ring cutter is an inverted cup shape with an annular cutting edge at its bottom end, the diameter of which is the same as the diameter of the finished polyurethane polishing disc. Its top is fixed to the bottom surface of the slider. The inner ring cutter is tubular and is disposed inside the outer ring cutter. Its top end is fixed to the inner wall of the top surface of the outer ring cutter, and its bottom end is an annular cutting edge that protrudes downward from the bottom surface of the outer ring cutter. The inner ring cutter can pass through the heat dissipation hole reserved at the base of the polyurethane polishing disc. The distance from the bottom surface of the inner ring cutter to the bottom surface of the outer ring cutter is equal to the height of the polyurethane polishing disc. The cutting support is fixed on the base and located directly below the ring cutter assembly. The cutting support has a mounting groove that matches the polyurethane polishing disc base. The bottom center of the mounting groove has a receiving groove that matches the polyurethane polishing disc connector.

2. The circumferential cutting device for polyurethane polishing discs as described in claim 1, characterized in that, The bottom surface of the mounting groove is provided with protrusions that correspond one-to-one with the inner ring cutter. The outer diameter of the protrusion is smaller than the inner diameter of the inner ring cutter, and the height of the protrusion is greater than the thickness of the polyurethane polishing disc base. The top surface of the outer ring cutter is provided with channels that correspond one-to-one with the inner ring cutter. A cleaning nozzle is installed on the top surface of the outer ring cutter. The cleaning nozzle enters the inner ring cutter through the channel and the air jet direction is vertically downward.

3. The circumferential cutting device for polyurethane polishing discs as described in claim 2, characterized in that, The frame is equipped with several cleaning nozzles, which blow air downwards at an angle and are directed into the groove.

4. The circumferential cutting device for polyurethane polishing discs as described in claim 1, characterized in that, It includes a horizontally placed second telescopic cylinder, the telescopic end of which is fixed with a finger cylinder, which is located on one side of the placement groove and is used to grip the cut Velcro.

5. The circumferential cutting device for polyurethane polishing discs as described in claim 4, characterized in that, A blade holder is fixed to the outer wall of the outer ring cutter. A slit-opening blade is provided at the bottom of the blade holder. The cutting edge of the slit-opening blade is flush with the bottom surface of the outer ring cutter. The blade holder and the second telescopic cylinder are located on both sides of the cutting seat.

6. The circumferential cutting device for polyurethane polishing discs as described in claim 1, characterized in that, The outer ring cutter is provided with a pressure rod, which is fixed to the center of the inner wall of the top surface of the outer ring cutter, and its bottom surface is flush with the bottom surface of the outer ring cutter.

7. The circumferential cutting device for polyurethane polishing discs as described in claim 1, characterized in that, The outer ring cutter includes an outer ring cutter seat and an outer ring cutter blade, which are detachably and fixedly connected.

8. The circumferential cutting device for polyurethane polishing discs as described in claim 7, characterized in that, The outer ring blade holder and the outer ring blade are connected by threads, and vertical grooves are arranged on the outer wall of the outer ring blade.

9. The circumferential cutting device for polyurethane polishing discs as described in claim 2, characterized in that, The channel extends into the inner cavity of the outer ring cutter to form an external threaded opening, and the top of the inner ring cutter is provided with an internal thread that mates with the external threaded opening.

10. The circumferential cutting device for polyurethane polishing discs as described in claim 2, characterized in that, The cleaning nozzle includes a nozzle body and a mounting ring integrally formed with the nozzle body. The mounting ring has a mounting hole and a screw. The top surface of the outer ring cutter has a screw hole that mates with the screw.

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