Grinding disc

Abstract

The utility model discloses an abrasive disc, which relates to the technical field of pulping and comprises a tooth surface layer and a back surface layer, a double-dovetail groove is jointly formed between the tooth surface layer and the back surface layer, and a double-dovetail pin is inserted into the double-dovetail groove in a clearance fit mode. A wedge opening is vertically formed in the surface of the end, located in the double-dovetail groove, of the double-dovetail pin in a penetrating mode, and a wedge used for expanding the double-dovetail pin is inserted into the wedge opening. According to the double-layer grinding disc, the problems that when the tooth surface layer and the back surface layer of the double-layer grinding disc are connected, the requirement for the matching precision of the double-dovetail pin and the double-dovetail groove is high, and the overall machining, manufacturing, mounting and dismounting difficulty is large are solved, and finally the working efficiency and the working safety of the grinding disc are greatly improved.

Description

[0001] This application is a divisional application with the application date of January 24, 2024, application number 2024201688380, and the invention name being a connection structure between a grinding plate and a mounting seat and a grinding plate. Technical Field

[0002] The utility model relates to the technical field of refining, and in particular to a refining disc. Background Art

[0003] Refiners, especially disc refiners, are widely used in industries such as pulping and papermaking, density board production, pharmaceuticals, tobacco, starch, pulp, nitrocellulose, seaweed, straw waste, rubber, and plastics. The core component of a refiner is the refining disc connected to the refiner mounting base, which impacts, squeezes, and grinds the raw materials. Consequently, the refining discs in a refiner are subject to significant wear and tear, necessitating frequent replacement. Furthermore, since the refining discs are typically integral, the entire disc must be removed from the machine and scrapped during replacement, resulting in high maintenance costs and significant waste of resources.

[0004] In response to this, some manufacturers have developed double-layer grinding discs, such as patent application CN215714248U, a combined grinding disc for a pulping machine. These can be achieved by splitting the grinding disc into a tooth surface layer with a rack and a circular back layer, and using bolts or screws to fix the tooth surface layer and the back layer to solve the problem that the entire grinding disc needs to be removed from the machine and scrapped when replacing the grinding disc. In addition, the grinding disc and the pulping machine mounting seat are also mostly connected by bolts or screws. However, the above-mentioned bolt connection method often has the following problems: First, after long-term use, the bolts or screws are prone to loosening or even falling off. In terms of double-layer grinding discs, this will cause damage to the rack and even the grinding disc. In terms of the grinding disc and the pulping machine mounting seat, this will affect the stability of the grinding disc connection installation, and ultimately affect the efficiency and safety of the grinding disc operation; second, multiple bolts or screws are required, which often affects the flow properties of the slurry and even the pulping effect.

[0005] In response to the above problems, our company chose to use double dovetail pins instead of bolts or screws for connection. Although this structural design has solved the above problems to a certain extent, it is found in actual application that the matching precision of the double dovetail pins and the dovetail grooves connected thereto is high, and the angle, width and depth requirements of the dovetail pins and the dovetail grooves are very high. The processing, manufacturing, installation and disassembly are difficult, so the improvement of the operating efficiency and safety of the grinding disc is still limited. For example, if the dovetail pin is too large, it cannot be inserted into the dovetail groove. If the dovetail pin is too small, there is a risk of loosening. After the dovetail pin and the dovetail groove are tightened, it is difficult to disassemble them again, which is time-consuming and labor-intensive.

[0006] In addition, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0007] The purpose of the present utility model is to provide a grinding wheel to solve the technical problem that in the prior art proposed in the above background technology, when double dovetail pins are used to connect the tooth surface layer and the back surface layer of the double-layer grinding wheel, the matching accuracy of the double dovetail pins and the double dovetail grooves is high, the overall processing, manufacturing, installation and disassembly are difficult, and ultimately the improvement of the operating efficiency and operating safety of the grinding wheel is still limited.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A connection structure between a grinding disc and a mounting seat comprises a grinding disc and a mounting seat, wherein a double dovetail groove Ⅰ is formed between the grinding disc and the mounting seat, and a double dovetail pin Ⅰ is inserted into the double dovetail groove Ⅰ with a clearance fit, wherein the double dovetail pin Ⅰ is an elastic pin, and the double dovetail pin Ⅰ is located in the middle position of one end surface of the double dovetail groove Ⅰ, and a wedge opening Ⅰ is vertically penetrated through the middle position, and a wedge Ⅰ for expanding the double dovetail pin Ⅰ is inserted into the wedge opening Ⅰ, and a pulling hole Ⅰ is provided on the end surface of the double dovetail pin Ⅰ away from the wedge opening Ⅰ.

[0010] Furthermore, the double dovetail pin I is formed by an upper dovetail portion I which is trapezoidal in shape and wide at the top and narrow at the bottom and a lower dovetail portion I which is trapezoidal in shape and narrow at the top and wide at the bottom, the lower surface width of the lower dovetail portion I is greater than the upper surface width of the upper dovetail portion I, the height of the upper dovetail portion I is less than the height of the lower dovetail portion I, and the double dovetail groove I includes an upper dovetail groove I which is opened on the lower surface of the grinding disc and is compatible with the upper dovetail portion I, and a lower dovetail groove I which is opened on the mounting seat and is compatible with the lower dovetail portion I.

[0011] In addition to the above technical solutions, the utility model also provides a grinding disc, including a tooth surface layer and a back surface layer, wherein a double dovetail groove II is formed between the tooth surface layer and the back surface layer, and a double dovetail pin II is inserted into the double dovetail groove II in a clearance-fitting manner, wherein the double dovetail pin II is an elastic pin, and the double dovetail pin II is located in the middle position of one end surface of the double dovetail groove II, and a wedge opening II is vertically penetrated therethrough, and a wedge II for expanding the double dovetail pin II is inserted into the wedge opening II, and a pulling hole II is provided on the end surface of the double dovetail pin II away from the wedge opening II.

[0012] Furthermore, the double dovetail pin II is formed by an upper dovetail portion II in a trapezoidal shape that is wide at the top and narrow at the bottom and a lower dovetail portion II in a trapezoidal shape that is narrow at the top and wide at the bottom, the lower surface width of the lower dovetail portion II is greater than the upper surface width of the upper dovetail portion II, the height of the upper dovetail portion II is less than the height of the lower dovetail portion II, and the double dovetail groove II includes an upper dovetail groove II opened on the lower surface of the tooth surface layer and adapted to the upper dovetail portion II, and a lower dovetail groove II opened on the back surface layer and adapted to the lower dovetail portion II.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. As far as the connection between the grinding disc and the refiner mounting seat is concerned, the present invention utilizes the double dovetail pin Ⅰ and the double dovetail groove Ⅰ to realize the connection between the grinding disc and the mounting seat. At the same time, the double dovetail pin Ⅰ is inserted into the double dovetail groove Ⅰ through the clearance fit of the double dovetail pin Ⅰ, so that the double dovetail pin Ⅰ can be easily inserted into the double dovetail groove Ⅰ, which is convenient for the installation of the double dovetail pin Ⅰ and even the entire grinding disc, and effectively reduces the precision requirements of the double dovetail pin Ⅰ and the double dovetail groove Ⅰ, which is convenient for processing and manufacturing. On this basis, the surface of one end of the double dovetail pin Ⅰ located in the double dovetail groove Ⅰ is vertically penetrated with a wedge opening Ⅰ, and a wedge Ⅰ for expanding the double dovetail pin Ⅰ is inserted into the wedge opening Ⅰ, which not only greatly improves the connection between the grinding disc and the mounting seat The stability and reliability of the connection and installation of the mounting seat also greatly facilitates the removal and replacement of the double dovetail pin I and even the entire grinding disc, that is, through the coordinated action of the wedge I and the wedge mouth I of the double dovetail pin I, the double dovetail pin I and the double dovetail groove I can be transformed into an interference fit, thereby tightly locking the grinding disc and the mounting seat. When the double dovetail pin I needs to be removed, it is only necessary to dig out the wedge I, and the interference fit between the double dovetail pin I and the double dovetail groove I will return to a clearance fit, thereby facilitating the removal of the double dovetail pin I and even the disassembly of the entire grinding disc. Ultimately, while greatly improving the operating safety of the grinding disc, the replacement efficiency of the grinding disc on the mounting seat is improved, thereby fully improving the operating efficiency of the grinding disc.

[0015] 2. As for the connection between the tooth surface layer and the back layer of the double-layer grinding disc, the utility model uses the double dovetail pin II and the double dovetail groove II to realize the connection between the tooth surface layer and the back layer. At the same time, the double dovetail pin II is inserted into the double dovetail groove II through the clearance fit of the double dovetail pin II, so that the double dovetail pin II can be easily inserted into the double dovetail groove II, which is convenient for the installation of the double dovetail pin II and even the entire grinding disc, and effectively reduces the precision requirements of the double dovetail pin II and the double dovetail groove II, which is convenient for processing and manufacturing. On this basis, the double dovetail pin II is vertically penetrated on the surface of one end of the double dovetail pin II in the double dovetail groove II, and a wedge II for expanding the double dovetail pin II is inserted into the wedge II. The cooperation setting not only greatly improves the connection between the tooth surface layer and the back layer The stability and reliability of the joint installation also greatly facilitates the extraction of the double dovetail pin II, that is, the removal and replacement of the tooth surface layer and the back layer, that is, through the coordinated action of the wedge II and the wedge mouth II of the double dovetail pin II, the double dovetail pin II and the double dovetail groove II can be transformed into an interference fit, thereby tightly locking the tooth surface layer and the back layer. When the double dovetail pin II needs to be removed, it is only necessary to dig out the wedge II, and the interference fit between the double dovetail pin II and the double dovetail groove II will return to a clearance fit, thereby facilitating the separation of the double dovetail pin II, that is, the tooth surface layer and the back layer. Ultimately, while greatly improving the operating safety of the grinding wheel, it also improves the replacement efficiency of the grinding wheel when replacing the tooth surface layer or the back layer, thereby fully improving the operating efficiency of the grinding wheel.

[0016] 3. In the present invention, the double dovetail pin I is configured as an elastic pin, so that the double dovetail pin I has elasticity and plasticity, allowing a loose clearance fit with a larger gap. The double dovetail pin I can have a larger gap with the double dovetail groove I, thereby further facilitating the installation of the double dovetail pin I and even the entire grinding disc, and further reducing the precision requirements of the double dovetail pin I and the double dovetail groove I, facilitating processing and manufacturing. At the same time, this setting also allows the wedge mouth I to smoothly rebound and shrink when the wedge I needs to be dug out for removing the double dovetail pin I, thereby further facilitating the removal of the double dovetail pin I and even the entire grinding disc, and further improving the replacement efficiency of the grinding disc on the mounting seat; in addition, the matching setting of the pulling hole I can also further facilitate the removal of the double dovetail pin I and even the entire grinding disc.

[0017] 4. In the present invention, the double dovetail pin II is configured as an elastic pin, so that the double dovetail pin II has elasticity and plasticity, allowing a loose clearance fit with a larger gap. The double dovetail pin II can have a larger gap with the double dovetail groove II, thereby further facilitating the installation of the double dovetail pin II and even the entire grinding disc, and further reducing the precision requirements of the double dovetail pin II and the double dovetail groove II, facilitating processing and manufacturing. At the same time, this setting also allows the wedge mouth II to smoothly rebound and shrink when the wedge II needs to be dug out due to the removal of the double dovetail pin II, thereby further facilitating the extraction of the double dovetail pin II, that is, the separation of the tooth surface layer and the back layer, and further improving the replacement efficiency of the grinding disc when replacing the tooth surface layer or the back layer; in addition, the matching setting of the pulling hole II can also further facilitate the extraction of the double dovetail pin II, that is, the separation of the tooth surface layer and the back layer.

[0018] 5. In the present invention, the wedge opening I is arranged in the middle position of the corresponding end face, which fully ensures the stability and reliability of the wedge I when acting in the double dovetail pin I, thereby further improving the stability and reliability of the connection and installation between the grinding disc and the mounting seat, and improving the operating safety of the grinding disc.

[0019] 6. In the present invention, the wedge opening II is arranged in the middle position of the corresponding end face, which fully ensures the stability and reliability of the wedge II when acting in the double dovetail pin II, thereby further improving the stability and reliability of the connection installation between the tooth surface layer and the back layer of the double-layer grinding wheel, and improving the operating safety of the grinding wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of the working principle of Example 1 of the present utility model;

[0021] Figure 2 is a schematic diagram of the structure of the double dovetail pin I of the utility model Figure 1 ;

[0022] Figure 3 is a schematic diagram of the structure of the double dovetail pin I of the utility model Figure 2 ;

[0023] Figure 4 is a schematic diagram of the working principle of the wedge I of the utility model;

[0024] FIG5 is a schematic diagram of the working principle of Example 2 of the present utility model;

[0025] Figure 6 is a schematic diagram of the structure of the double dovetail pin II of the utility model Figure 1 ;

[0026] Figure 7 is a schematic diagram of the structure of the double dovetail pin II of the utility model Figure 2 ;

[0027] Figure 8 is a schematic diagram of the working principle of wedge II of the present invention;

[0028] In the figure: 1. Grinding disc, 2. Mounting seat, 3. Double dovetail groove I, 31. Upper dovetail groove I, 32. Lower dovetail groove I, 4. Double dovetail pin I, 41. Upper dovetail part I, 42. Lower dovetail part I, 5. Wedge mouth I, 6. Wedge I, 7. Pulling hole I, 8. Tooth surface layer, 9. Back surface layer, 10. Double dovetail groove II, 101. Upper dovetail groove II, 102. Lower dovetail groove II, 11. Double dovetail pin II, 111. Upper dovetail part II, 112. Lower dovetail part II, 12. Wedge mouth II, 13. Wedge II, 14. Pulling hole II. DETAILED DESCRIPTION

[0029] The following examples are used to further illustrate the content of the present invention, but do not limit the application of the present invention. Example 1:

[0030] Please refer to Figures 1 to 4, which show a connection structure between a grinding disc and a mounting seat, including a grinding disc 1 (in this embodiment, a grinding disc 1 Φ720mm full-circular grinding disc is selected), a mounting seat 2 and a double dovetail pin I 4. The lower surface of the grinding disc 1 is provided with an upper dovetail groove I 31 with an inverted trapezoidal structure that is wide at the top and narrow at the bottom. The mounting seat 2 is provided with a lower dovetail groove I 32 with a trapezoidal structure that is narrow at the top and wide at the bottom (in this embodiment, the lower dovetail groove I 32 vertically penetrates the mounting seat 2). The upper dovetail groove I 31 and the lower dovetail groove I 32 are combined to form a double dovetail groove I 3. The double dovetail pin I 4 is inserted into the double dovetail groove I 3 to connect them to form

[0031] A loose clearance fit with a gap of 0.6mm (the number of double dovetail pins Ⅰ 4 and the double dovetail grooves Ⅰ 3 connected thereto can be set as needed, and the position can be set at the inner edge or outer edge of the grinding plate 1), the double dovetail pin Ⅰ 4 is an elastic pin (low-cost and durable carbon steel, nylon, aluminum and other materials can be used, which have elasticity and plasticity, allowing a loose clearance fit with a larger gap), the double dovetail pin Ⅰ 4 is located in the middle position of one end surface of the double dovetail groove Ⅰ 3 and is penetrated by a wedge opening Ⅰ 5, the wedge opening Ⅰ 5 is vertically arranged and a wedge Ⅰ 6 for expanding it is inserted inside (the functions and structures of conventional components such as wedges are well known in the art, and the connection settings are also common knowledge, so no further explanation is given here, and it is not shown in detail in the accompanying drawings), and a pulling hole Ⅰ 7 is provided on the other end surface of the double dovetail pin Ⅰ 4.

[0032] Furthermore, the double dovetail pin Ⅰ 4 is formed by an upper dovetail portion Ⅰ 41 which is trapezoidal in shape and wide at the top and narrow at the bottom and a lower dovetail portion Ⅰ 42 which is trapezoidal in shape and narrow at the top and wide at the bottom, and the height of the upper dovetail portion Ⅰ 41 is smaller than the height of the lower dovetail portion Ⅰ 42, and the upper surface width of the upper dovetail portion Ⅰ 41 is smaller than the lower surface width of the lower dovetail portion Ⅰ 42, thereby avoiding the loosening of the double dovetail pin Ⅰ 44 during operation to a certain extent.

[0033] The working principle and process of this embodiment are as follows: wedge I 6 is inserted into wedge opening I 5, causing one end of double dovetail pin I 4 located in double dovetail groove I 3 to expand, forming an interference fit between double dovetail pin I 4 and double dovetail groove I 3, thereby locking the grinding disc 1 and the mounting seat 2.

[0034] When it is necessary to remove the double dovetail pin Ⅰ 4, it is only necessary to dig out the wedge Ⅰ 6 first, so that the wedge mouth Ⅰ 5 rebounds and shrinks, and the interference fit between the double dovetail pin Ⅰ 4 and the double dovetail groove Ⅰ 3 can be loosened and converted into a clearance fit. Here, after screwing the bolt into the pulling hole Ⅰ 7, the double dovetail pin Ⅰ 4 can be easily pulled out using a puller. Example 2:

[0035] Please refer to Figures 5 to 8, which show a grinding disc (in this embodiment, a Φ1066 mm sector-shaped split grinding disc is selected), including a tooth surface layer 8 (the basic structure such as the rack provided on the tooth surface layer of the existing grinding disc is not specifically described here, nor shown in detail in the accompanying drawings, but this should not limit its functional realization), a back layer 9 and a double dovetail pin II 11. The lower surface of the tooth surface layer 8 is provided with an upper dovetail groove II 101 with an inverted trapezoidal structure that is wide at the top and narrow at the bottom. The back layer 9 is provided with a lower dovetail groove II 102 with a trapezoidal structure that is narrow at the top and wide at the bottom (in this embodiment, the lower dovetail groove II 102 vertically penetrates the back layer 9). The upper dovetail groove II 101 and the lower dovetail groove II 102 are combined to form a double dovetail groove II 10. The double dovetail pin II 11 is inserted into the double dovetail groove II 10 to connect them to form a loose clearance fit with a gap of 1 mm (double dovetail pin II 11). The number of dovetail pins Ⅱ11 and the double dovetail grooves Ⅱ10 connected thereto can be set as needed, and the position can be set at the inner edge or outer edge of the tooth surface layer 8). The double dovetail pin Ⅱ11 is an elastic pin (can be made of low-cost and durable carbon steel, nylon, aluminum and other materials, with elasticity and plasticity, allowing loose clearance fit with a larger gap). The double dovetail pin Ⅱ11 is located in the middle position of one end surface of the double dovetail groove Ⅱ10 and is penetrated by a wedge mouth Ⅱ12. The wedge mouth Ⅱ12 is vertically arranged and a wedge Ⅱ13 for expanding it is inserted inside (the functions and structures of conventional components such as wedges are well known in the art, and the connection settings are also common knowledge, so no further explanation is given here, and it is not shown in detail in the accompanying drawings). The other end surface of the double dovetail pin Ⅱ11 is provided with a pulling hole Ⅱ14.

[0036] Furthermore, the double dovetail pin II 11 is formed by an upper dovetail portion II 111 which is trapezoidal in shape and wide at the top and narrow at the bottom, and a lower dovetail portion II 112 which is trapezoidal in shape and narrow at the top and wide at the bottom, which are connected in one piece. The height of the upper dovetail portion II 111 is smaller than the height of the lower dovetail portion II 112, and the upper surface width of the upper dovetail portion II 111 is smaller than the lower surface width of the lower dovetail portion II 112, thereby avoiding the loosening of the double dovetail pin II 111 during operation to a certain extent.

[0037] The working principle and process of this embodiment are as follows:

[0038] The wedge II 13 is inserted into the wedge opening II 12 , so that one end of the double dovetail pin II 11 located in the double dovetail groove II 10 expands, and an interference fit is formed between the double dovetail pin II 11 and the double dovetail groove II 10 , thereby locking the tooth surface layer 8 and the back surface layer 9 .

[0039] When it is necessary to remove the double dovetail pin II 11, it is only necessary to dig out the wedge II 13 first, so that the wedge mouth II 12 rebounds and shrinks, and the interference fit between the double dovetail pin II 11 and the double dovetail groove II 10 can be loosened and converted into a clearance fit. Here, after screwing the bolt into the pulling hole II 14, the double dovetail pin II 11 can be easily pulled out using a puller.

Claims

1. A grinding disc comprising a tooth surface layer and a back surface layer, characterized in that: A double dovetail groove II is formed between the tooth surface layer and the back surface layer, and a double dovetail pin II is inserted into the double dovetail groove II in a clearance-fitting manner. A wedge opening II is vertically penetrated on one end surface of the double dovetail pin II in the double dovetail groove II, and a wedge II for expanding the double dovetail pin II is inserted into the wedge opening II.

2. A grinding disc according to claim 1, characterized in that: The double dovetail pin II is an elastic pin.

3. A grinding disc according to claim 1, characterized in that: The double dovetail pin II is formed by an upper dovetail portion II in a trapezoidal shape that is wide at the top and narrow at the bottom and a lower dovetail portion II in a trapezoidal shape that is narrow at the top and wide at the bottom. The lower surface width of the lower dovetail portion II is greater than the upper surface width of the upper dovetail portion II, and the height of the upper dovetail portion II is less than the height of the lower dovetail portion II.

4. A grinding disc according to claim 3, characterized in that: The double dovetail groove II includes an upper dovetail groove II adapted to the upper dovetail portion II, and a lower dovetail groove II adapted to the lower dovetail portion II. The upper dovetail groove II is opened on the lower surface of the tooth surface layer, and the lower dovetail groove II is opened on the back surface layer.

5. A grinding disc according to claim 1, characterized in that: The wedge opening II is provided at the middle position of the corresponding end surface, and a pulling hole II is provided on the surface of one end of the double dovetail pin II away from the wedge opening II.

Images