Cutting device with quick-change tool holder

Abstract

A cutting device of a quick-change tool holder is used in a ground processing machine. The cutting device includes a tool holder and a base. The tool holder has a main body. A tool mounting portion is provided in a processing side area of ​​the upper part of the main body, and an extended handle portion is provided on the fixed part side of the lower part of the main body. A plurality of open external surfaces are provided between the tool mounting portion and the extended handle portion of the main body. In the cutting device of the quick-change tool holder of the present invention, the tool holder and the base have multiple working surfaces that cooperate with each other, thereby expanding the contact area, and the working force can be released from the tool holder to the base to the maximum extent, and the tool holder can rotate freely with the help of the base accommodating portion, making it more convenient to disassemble the tool holder.

Description

Technical Field

[0001] The invention belongs to the technical field of cutting tools, and in particular relates to a cutting device of a quick-change tool holder. Background Art

[0002] A cold planer, also known as a road pulverizer or road scarifier, is a machine that generally comprises a frame supported on all four sides by tracked or wheeled drive units. The frame is used to mount the engine, operator station and milling drum. The milling drum equipped with cutting tools is rotated by the engine through suitable interconnections to break up the surface of the road.

[0003] Such machines are usually machines with a driven working roll which can rotate about a horizontal axis and on which a plurality of ground working tools, in particular shears or chisels and in particular round bar chisels, are arranged.

[0004] In the actual cutting process, the milling drum rotates rapidly and continuously to cut off the damaged ground. In such a reciprocating cutting process, several replaceable supports installed on the milling drum regularly and successively bear this high-frequency, high-impact and strong vibration working condition. Under such harsh working conditions, the combination of the replaceable support and the base is very easy to change, such as misalignment, loosening, separation and falling off. When analyzing the causes of similar situations, we found that the replaceable support has variable freedom and instability in the assembly positioning with the base, which greatly affects the quality of road construction, and the construction project needs to be interrupted to repair or reassemble the replaceable support that has fallen off and is missing.

[0005] The main components of this replaceable support system include a base part and a replaceable support connected to the base part and having a processing tool. In particular, the replaceable support can be formed integrally with the processing tool, or it can also have a suitable tool holder, which is configured to accommodate a tool for ground processing, such as a chisel, in particular a round bar chisel, and the base part is firmly fixed, for example, by being fixed to the cylindrical outer surface of the supporting loosening roller, in particular by being fixedly welded to the roller body. The base part thus constitutes a connecting element of the replaceable support system and the roller base body. Although conventional quick-change tool holder systems have long been proven to be successful in principle, there is still a need for improvement, which particularly relates to the replacement of processing tools and / or quick-change tool holders and the reliability and service life of the entire quick-change tool holder system. For example, due to repeated impact forces, the assembly surfaces of the replaceable support and the base are worn and deformed, so that the purpose of being fastened to each other cannot be achieved, that is, the entire replaceable support system can no longer be used. Summary of the invention

[0006] The object of the present invention is to provide a cutting device with a quick-change tool holder which can lead the machining force to a base component in a stress-optimized manner during machining.

[0007] Another object of the present invention is to provide a cutting device with a quick-change tool holder, in which the tool holder can rotate freely with the aid of a base accommodating portion, and the tool holder can be more conveniently disassembled.

[0008] In order to solve the above technical problems, the present invention discloses a cutting device with a quick-change tool holder, which is used for a ground processing machine. The cutting device 1 includes a tool holder 2 and a base 3. The tool holder 2 has a main body 210. A tool mounting portion 22 is provided on the processing portion side of the upper part of the main body 210, and an extended handle portion 202 is provided on the fixing portion side of the lower part of the main body 210. It is characterized in that a plurality of open external surfaces are provided between the tool mounting portion 22 and the extended handle portion 202 of the main body 210.

[0009] Furthermore, the plurality of open external surfaces include a pressing surface 28, a pressure surface 29, and a transition surface 200, which are arranged at angles to each other.

[0010] Furthermore, an angle d is formed between the pressing surface 28 and the central axis L of the elongated handle 202 .

[0011] The pressure surface 29 is at least partially arranged behind the elongated shank 202 opposite to the second working direction V2 . An angle e is formed between the pressure surface 29 and the pressing surface 28 , and the two are transitionally connected via a first rounded corner 208 .

[0012] The transition surface 200 is at least partially arranged between the pressure surface 29 and the tool mounting portion 22, and the transition surface 200 is at least partially arranged behind the extended shank 202 opposite to the second working direction V2. The transition surface 200 and the pressure surface 29 have an angle f and are transitionally connected through a second fillet 209.

[0013] Furthermore, the angle d=angle e=angle f=90°, that is, the pressing surface 28 is parallel to the transition surface 200; and the pressure surface 29 is parallel to the central axis L.

[0014] Furthermore, the pressure surface 29 is configured as an arc surface with a radius of R1, and its center O1 is on the median plane M of the tool holder 2 and coincides with the central axis L. The size of R1 is preferably 50 mm-60 mm.

[0015] Furthermore, the abutment surface 36 of the base body 3 is configured as an arc surface with a radius R2, and the center O2 thereof is on the median plane M1 of the base body 3 and coincides with the central axis L1.

[0016] Furthermore, the arc surfaces R1 and R2 are set to R1=R2, and the center O1 of the pressure surface 29 coincides with the center O2 of the abutment surface 36.

[0017] Furthermore, the pressing surface 28 is in contact with the force-bearing surface 37 of the base 3 ; the pressure surface 29 is in contact with the abutment surface 36 of the base 3 , and the tool holder 2 can rotate around the center O2 with the help of the extended handle 202 .

[0018] Furthermore, the elongated handle 202 is in a semi-conical shape with a diameter gradually decreasing from top to bottom, and the ratio of the top diameter x to the bottom diameter y of the elongated handle 202 is preferably 1.1-2.

[0019] Furthermore, an auxiliary surface 38 is provided on the upper end surface of the substrate 3 relative to the transition surface 200 , and the transition surface 200 does not fit the auxiliary surface 38 of the substrate 3 , and a gap of not less than 0.1 mm is maintained.

[0020] The cutting device of the quick-change tool holder of the present invention has at least the following advantages:

[0021] The cutting device of the quick-change tool holder of the present invention has multiple working surfaces that cooperate with each other between the tool holder and the base, thereby expanding the contact area, and can maximize the release of working force from the tool holder to the base. In addition, the tool holder can rotate freely with the help of the base accommodating portion, making it more convenient to disassemble the tool holder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall view of the left rear side of the cutting device of the quick-change tool holder of the present invention;

[0023] Figure 2 It is an exploded view of the left rear of the cutting device of the quick-change tool holder of the present invention;

[0024] Figure 3 It is a right front exploded view of the cutting device of the quick-change tool holder of the present invention;

[0025] Figure 4 It is a perspective view of the left rear side of the tool holder of the cutting device of the quick-change tool holder of the present invention;

[0026] Figure 5 It is a left side front view of the tool holder of the cutting device of the quick-change tool holder of the present invention;

[0027] Figure 6 It is a bottom front view of the tool holder of the cutting device of the quick-change tool holder of the present invention;

[0028] Figure 7 The tool holder of the cutting device of the quick-change tool holder of the present invention is Figure 6 A front and side view of the body cut along the median plane M;

[0029] Figure 8 is a top elevation view of a base body of a cutting device of a quick-change tool holder of the present invention;

[0030] Fig. 9 The base of the cutting device of the quick-change tool holder of the present invention is Figure 8 A front and side view cut through the median plane M1;

[0031] Fig.10 It is a front overall view of the cutting device of the quick-change tool holder of the present invention;

[0032] Fig.11 The cutting device of the quick-change tool holder of the present invention is Fig.10 Frontal and lateral view of the middle AA section;

[0033] Fig.12 The cutting device of the quick-change tool holder of the present invention is Fig.10 A front side view cut along line AA without components 4 and 5. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below through examples so that those skilled in the art can implement the invention with reference to the description.

[0035] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0036] Figure 1 The cutting device 1 is shown, which is composed of a base 3, a tool holder 2, a locking component 4 and a fastening component 5. The tool holder 2 is replaceably connected to the base 3. A connecting surface 3.1 is provided below the base 3, and the connecting surface 3.1 is in a concave arched state, wherein the size of the arch is defined according to the outer diameter of the milling drum. Therefore, the base 3 can be mounted on the outer surface of the milling drum with the connecting surface 3.1 and fixedly welded thereto.

[0037] like Figures 2 to 4 As shown, the tool holder 2 is installed in the receiving portion 30 of the base 3 by means of the extended handle 202, the fastening component 5 is inserted into the blind hole 1 33 of the base 3, and then the locking component 4, which can be a screw, is passed through the through hole 204 of the tool holder 2 and the blind hole 2 34 of the base 3. After the internal thread 50 of the fastening component 5 is properly adjusted to be aligned with the external thread 41 of the locking component 4, a tool such as a wrench can be used to insert it into the adapter hole 40 of the locking component 4 and rotate it clockwise. The locking component 4 will be gradually screwed into the internal thread 50 of the fastening component 5. Under appropriate torque, the locking surface 42 of the locking component 4 will eventually fit tightly with the countersunk surface 205.1 of the tool holder 2. At this time, the pressing surface 28 of the tool holder 2 and the force-bearing surface 37 of the base 3 are in contact with each other; the pressure surface 29 of the tool holder 2 and the abutment surface 36 of the base 3 are in contact with each other; the transition surface 200 of the tool holder 2 and the auxiliary surface 38 of the base 3 are not in contact with each other, and a reasonable gap is maintained.

[0038] Also like Figure 2-Figure 3 As shown, there is a working surface in front of the main body 210 of the tool holder 2, including a discharge surface 1 25, a discharge surface 26, and a discharge surface 3 27. The discharge surface 1 25 is at the front, and the discharge surface 1 25 and the discharge surface 2 26 are arranged at an angle; the discharge surface 1 25 and the discharge surface 3 27 are arranged at an angle, and the three form an arrow-shaped geometric shape, which has the function of protecting the substrate 3 and can reduce the cutting resistance during work. The front of the substrate 3 has a raised part, including the frontmost surface 1 301, the surface 2 300 on both sides, the surface 3 302, the surface 4 303, and the surface 5 304, which are also arranged at an angle, so that when multiple substrates 3 are arranged in front and back for welding, there will be a better spatial effect.

[0039] like Figure 4 Figure 6 As shown, the through hole 204 of the tool holder 2 passes through the pressing surface 28, the pressure surface 29 and the transition surface 200; the countersunk hole 205 passes through the transition surface 200 and partially intersects with the pressure surface 29.

[0040] Figure 5 It is shown that the elongated handle 202 has a supporting surface 203 and a central axis L, and the supporting surface 203 extends obliquely along the central axis L and away from the main body 210, and its surface line 206 has an angle a around the central axis. Preferably, the angle a ranges from 5° to 15°, and is particularly preferably set to 10°, which is conducive to the tool holder 2 to generate sufficient force to be fastened in the base 3, and because the tool holder 2 is a wearing part and needs to be replaced according to actual conditions, then the force generated by the angle within this range is also conducive to disassembly, so that the force is not too large and cannot be disassembled. Obviously, the elongated handle 202 forms a cone shape, and it can be realized that its diameter gradually decreases along the V3 direction. In addition, it is connected to the pressing surface 28 through the reinforcement part 201.

[0041] Also like Figure 5 As shown, the pressing surface 28 and the pressure surface 29 form an angle e. Preferably, the angle e is set to 90°.

[0042] The pressure surface 29 and the transition surface 200 form an angle f. Preferably, the angle f is set to 90°. Since the tool holder 2 is a wearing part and needs to be replaced according to actual conditions, the clamping surface 28 and the pressure surface 29 are set in a vertical state, which is most conducive to the mutual limitation and stopping of the two, and is also conducive to the disassembly of the tool holder 2. The same is true for setting the angle f to 90°.

[0043] like Figure 7As shown, there is an angle c between the central axis L0 of the tool mounting portion 22 and the central axis L of the elongated shank 202. Preferably, the angle c is in the range of 130°-140°. It is proved in practice that when the cutting tool is installed in the tool mounting portion 22, the cutting tool needs to form a certain angle with the ground to be processed when performing rotary cutting along the second working direction V2. This angle is beneficial to improving the service life of the cutting tool and the flatness of the cutting ground. The main body 210 has a clamping surface 28, which is arranged between the elongated shank 202 and the tool mounting portion 22, and there is an angle d between the clamping surface 28 and the central axis L of the elongated shank 202. Preferably, the angle d is set to 90°. Since the central axis L22 is parallel to the central axis L, the angle e is 90°, so the angle d is also 90°.

[0044] like Figure 6 Figure 7 As shown, the main body 210 includes a pressure surface 29, which is at least partially arranged behind the elongated shank 202 against the second working direction V2, and is transitionally connected to the pressing surface 28 through a first fillet 208. In addition, the main body 210 includes a transition surface 200, which is at least partially arranged between the pressure surface 29 and the tool mounting portion 22, and is at least partially arranged behind the elongated shank 202 against the second working direction V2, and is transitionally connected to the pressure surface 29 through a second fillet 209. The pressure surface 29 is configured as an arc surface with a radius of R1, and its center O1 is on the median plane M of the tool holder 2, and coincides with the central axis L. Preferably, the size range of R1 is between 50mm and 60mm.

[0045] like Figure 7 As shown, the main body 210 is provided with a through hole 204, which is arranged behind the elongated handle 202 in the direction opposite to the second working direction V2 and penetrates the main body 210. The main body 210 is provided with a countersunk hole 205, which is arranged behind the elongated handle 202 in the direction opposite to the second working direction V2. The through hole 204 and the countersunk hole 205 share a central axis L22, and the countersunk hole 205 is arranged above the through hole 204 in the direction opposite to the third direction V3. Moreover, the central axis L22 is arranged in parallel with the central axis L of the elongated handle 202.

[0046] Another example Figure 7 As shown, the entrance of the tool mounting portion 22 has a tool mounting surface 21, which is the end and abutment surface after the tool is installed. Because the tool rotates at high speed during operation, the tool mounting surface 21 will be gradually worn down as the tool is used. A plurality of wear indicator grooves 20 are provided on the outer circumferential surface of the tool mounting portion 22 to judge the use and wear of the tool mounting surface 21. When the wear indicator grooves 20 are all worn away, a new tool holder 2 must be replaced and installed on the base 3 of the cutting device 1.

[0047] like Figure 8 Fig. 9 As shown, the receiving portion 30 of the base 3 has a central axis L1, and the surface element line 32 of the receiving surface 30.1 forms an angle b around L1. It can be seen that the receiving portion 30 forms a conical hollow chamber, and in fact, its diameter gradually decreases against the direction V3. Preferably, the range of angle b is between 5°-15°, and angle b=angle a. The receiving portion entrance 31 is between the force-bearing surface 37 and the receiving portion 30, the force-bearing surface 37 is connected to the abutting surface 36 through the fillet three 39, and the abutting surface 36 is connected to the auxiliary surface 38 through the fillet four 39.1. The blind hole 2 34 contains the central axis L2 and passes through the auxiliary surface 38, the abutting surface 36, and the force-bearing surface 37. The countersunk hole 2 35 is coaxially arranged with the blind hole 2 34 and is arranged above the blind hole 2 34 against the direction V3. The blind hole 1 33 has a central axis L3, which is arranged along the V2 direction. It is preferably provided that L2 and L3 are arranged in a vertical state. The contact surface 36 is arranged as an arc surface with a radius of R2, and its center O2 is on the median plane M1 of the base 3 and coincides with the central axis L1. Preferably, the size range of R2 is between 50mm and 60mm.

[0048] like Fig.10 The assembled cutting device 1 is cut in the direction of AA to obtain a full cross-sectional view of the tool holder 2, the base 3, and the fastening component 5. Fig.11The tool holder 2 is fixed in the receiving portion 30 of the base 3 by means of the extended shank 202, and if the angle a=angle b is set, then the central axis L1 of the receiving portion 30 coincides with the central axis L of the extended shank 202. As mentioned above, the cylindrical fastening component 5 has an internal thread 50, which acts as a nut. When the locking component 4 is tightened, under the action of the clamping force F1 in the V3 direction, its locking surface 42 is tightly fitted with the countersunk surface 205.1 of the tool holder 2. At the same time, the outer cylindrical surface 51 of the fastening component 5 tightly presses the inner surface of the blind hole 33 to form a surface-to-surface tangent structure. It can be seen that due to the action of the clamping force F1, a force F is generated, which is generated along the central axis L of the extended shank 202, and the support surface 203 and the receiving surface 30.1 of the receiving portion 30 form a conical matching relationship. The advantage of this is that under the action of the force in the F direction, the conical fit forms an interference fit relationship, and the tightness between the support surface 203 and the receiving surface 30.1 of the receiving portion 30 increases as the force in the V3 direction increases. This allows the support surface 203 of the extended handle 202 to fully mesh with the receiving surface 30.1 of the receiving portion 30. At the same time, the pressing surface 28 and the force-bearing surface 37; the pressure surface 29 and the abutment surface 36 are also tightly fitted, and the transition surface 200 and the auxiliary surface 38 are set to maintain a small gap, such as 0.5mm. This is because there is a processing tolerance, and it is difficult to achieve the simultaneous contact between the pressing surface 28 and the force-bearing surface 37; the transition surface 200 and the auxiliary surface 38, so only the pressing surface 28 with a larger contact area and the force-bearing surface 37 are allowed to contact together.

[0049] Also like Fig.11 As shown, when the tool holder 2 is to be disassembled, the fastening component 5 is first unscrewed counterclockwise. Considering that when the cutting device 1 is actually working, fine debris and residues on the road surface will enter the gap between the outer cylindrical surface 51 of the fastening component 5 and the inner surface of the blind hole 33, blocking the fastening component 5, a circular annular groove 53 is provided on the end of the outer cylindrical surface 51 of the fastening component 5 exposed from the base 3, so that the circular annular groove 53 can be pried out with the flat mouth of a flat tool, such as a flat-bladed screwdriver, so that the fastening component 5 can be easily taken out against the direction V2.

[0050] like Fig.10 The assembled cutting device 1 is cut in the direction of DD to obtain a full cross-sectional view of the tool holder 2, the base 3, the locking component 4 and the fastening component 5. Fig.12, setting R1=R2, then the center O1 of the pressure surface 29 coincides with the center O2 of the abutment surface 36, that is, the central axis L1 of the accommodating portion 30 coincides with the central axis L of the extended shank 202, and the clamping surface 28 fits with the force surface 37 of the base 3; the pressure surface 29 fits with the abutment surface 36 of the base 3, therefore, the tool holder 2 can rotate freely around the center O2 by 360° with the help of the extended shank 202. This is beneficial to the precision control of machining, and it is also faster and more convenient to disassemble the tool holder 2. When disassembling the tool holder 2, if the pressing surface 28 and the force-bearing surface 37; the pressure surface 29 and the abutment surface 36 are tightly bonded together due to rust caused by the spraying of cooling water when the cutting device 1 is working, you can use a hammer to knock the side discharge surface 4 26.1 and the discharge surface 5 27.1 of the tool holder 2 back and forth along the V direction and the V1 direction to rotate the tool holder 2, and the rust adhesion can be easily released.

[0051] from Figure 6 Figure 7 It can be seen that three disassembly parts 23 are provided on the tool holder 2, which are arranged between the pressing surface 28 and the discharging surface 26.1, the pressing surface 28 and the discharging surface 27.1, and the pressing surface 28 and the discharging surface 25, respectively, and are recessed into the main body 210 in the opposite direction of V3. The disassembly parts 23 are used as spare parts for disassembling the tool holder 2. A pry bar, such as a flat-blade screwdriver, can be inserted into the disassembly part 23, and the force-bearing surface 37 of the base body 3 is used to form a lever principle to pry the three disassembly parts 23 in sequence. Thus, the purpose of disassembling the tool holder 2 is achieved.

[0052] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A cutting device with a quick-change tool holder, used in a floor processing machine, the cutting device (1) comprising a tool holder (2) and a base (3), the tool holder (2) having a main body (210), a tool mounting portion (22) being provided on the processing portion side of the upper part of the main body (210), and an elongated handle portion (202) being provided on the fixing portion side of the lower part of the main body (210), characterized in that: A plurality of open external surfaces are provided between the tool mounting portion (22) and the elongated handle portion (202) of the main body (210); The plurality of open external surfaces include a pressing surface (28), a pressure surface (29), and a transition surface (200), which are arranged at an angle to each other; The pressure surface (29) is configured as an arc surface, and its center (O1) is on the median plane (M) of the tool holder (2) and coincides with the central axis (L), and its radius R1 is 50 mm to 60 mm; The abutment surface (36) of the base (3) is configured as an arc surface, and its center (O2) is on the median plane (M1) of the base (3) and coincides with the central axis (L1), its radius R2 and the radius R1 are set to R1=R2, and the center (O1) of the pressure surface (29) coincides with the center (O2) of the abutment surface (36); The pressing surface (28) fits with the force-bearing surface (37) of the base (3); the pressure surface (29) fits with the abutment surface (36) of the base (3), and the tool holder (2) rotates in a circle around the center (O2) with the aid of the extended handle (202); It also includes a fastening component (5) inserted into the base (3) and a locking component (4) inserted into the tool holder (2), the fastening component (5) being machined with a threaded hole having an internal thread (50), the locking component (4) being machined with an external thread (41) matching the internal thread (50), and the locking component (4) connecting the tool holder (2) and the base (3) via the threaded hole; The fastening component (5) is exposed on the surface of the base (3), and a circular annular groove (53) is provided on the portion of the fastening component (5) exposed on the surface of the base (3).

2. The cutting device of the quick-change tool holder according to claim 1, characterized in that: An angle d is formed between the pressing surface (28) and the central axis (L) of the elongated handle (202); The pressure surface (29) is at least partially arranged behind the elongated handle (202) opposite to the second working direction (V2), and an angle e is formed between the pressure surface (29) and the pressing surface (28), and the two are transitionally connected via a first rounded corner (208); The transition surface (200) is at least partially arranged between the pressure surface (29) and the tool mounting portion (22), and the transition surface (200) is at least partially arranged behind the extended shank (202) opposite to the second working direction (V2). The transition surface (200) and the pressure surface (29) have an included angle f and are transitionally connected via a second fillet (209).

3. The cutting device of the quick-change tool holder according to claim 2, characterized in that: The angle d = angle e = angle f = 90°, that is, the pressing surface (28) is parallel to the transition surface (200); and the pressure surface (29) is parallel to the central axis (L).

4. The cutting device of the quick-change tool holder according to claim 1, characterized in that: The elongated handle (202) is in the shape of a semi-cone with a diameter that gradually decreases from top to bottom, and the ratio of the top diameter (x) to the bottom diameter (y) of the elongated handle (202) is 1.1-2.

5. The cutting device of the quick-change tool holder according to claim 1, characterized in that: An auxiliary surface (38) is provided at a position opposite to the transition surface (200) on the upper end surface of the base body (3); the transition surface (200) and the auxiliary surface (38) of the base body (3) are not in contact with each other and a gap of not less than 0.1 mm is maintained.

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