Multi-edge indexable spiral groove milling cutter

Abstract

The invention relates to the technical field of milling cutters, in particular to a multi-blade indexable spiral groove milling cutter which comprises a cutter rest, a first cutter and a second cutter which are arranged in a staggered mode are arranged on the cutter rest, a first indexing mechanism used for enabling the first cutter to move is arranged in the cutter rest, and a second indexing mechanism used for enabling the second cutter to move is arranged in the cutter rest. The first indexing mechanism comprises a first spline shaft, a first spline groove for sliding limiting of the first spline shaft is formed in the tool rest, and a first wedge block elastically installed in the tool rest in a sliding mode is rotationally installed on the first spline shaft. Through the design of the first transposition mechanism and the second transposition mechanism, transposition of the first cutter and the second cutter can be rapidly completed, screws for fixing the first cutter and the second cutter do not need to be disassembled, the working efficiency is greatly improved, and through the design of the first spline shaft and the second spline shaft, in the milling cutter machining process, the machining efficiency is greatly improved. And the first cutter and the second cutter can be kept stable in the working process.

Description

Technical Field

[0001] The invention relates to the technical field of milling cutters, in particular to a multi-blade indexable spiral groove milling cutter. Background Art

[0002] An indexable milling cutter is a milling cutter that can be indexed for use. The tool adopts a multi-edge structure. When the main cutting edge is worn, the tool is indexed to activate the spare cutting edge, which significantly reduces the inventory cost and replacement frequency of the tool.

[0003] Although indexable milling cutters significantly reduce the inventory cost and replacement frequency of tools, when the tool needs to be indexed, the tools on the same layer usually need to be indexed together. Due to the special shape of the spiral groove milling cutter, the spiral groove milling cutters in the existing technology lack the means to quickly complete the indexing. In addition, when the tool is indexed, the bolts fixing the tool need to be removed first, and then the tool is removed and indexed, and then the tool is fixed with bolts. The tool indexing efficiency is low and the steps are cumbersome, which has a great impact on the processing efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a multi-edge indexable spiral groove milling cutter.

[0005] The technical implementation scheme of the present invention is: a multi-blade indexable spiral groove milling cutter, including a tool holder, on which two groups of staggered first tools and second tools are arranged, a first indexing mechanism for making the first tool movable is provided in the tool holder, and a second indexing mechanism for making the second tool movable is provided, the first indexing mechanism includes a first spline shaft, the tool holder has a first spline groove for sliding and limiting the first spline shaft, a first wedge block elastically slidably installed in the tool holder is rotatably installed on the first spline shaft, a first wedge plate used in conjunction with the first wedge plate is provided on one side of the first wedge block, a first sliding rod is fixedly installed on the first wedge plate, and the first wedge plate and the first sliding rod are both slidably installed in the tool holder.

[0006] Furthermore, the first indexing mechanism further includes a first rectangular box fixedly mounted on the first wedge plate, a first friction strip being elastically slidably mounted in the first rectangular box, and the first friction strip being used in conjunction with the first spline shaft.

[0007] Furthermore, the top of the first friction strip consists of a horizontal surface and a trapezoidal surface.

[0008] Furthermore, a first damping plate is fixedly installed in the first rectangular box.

[0009] Furthermore, the second indexing mechanism includes a second spline shaft, the tool holder has a second spline groove for sliding and limiting the second spline shaft, the second spline shaft is rotatably mounted with a second wedge block elastically slidably mounted in the tool holder, one side of the second wedge block is provided with a second wedge plate for use therewith, the second wedge plate is fixedly mounted with a second sliding rod, and the second wedge plate and the second sliding rod are both slidably mounted in the tool holder.

[0010] Furthermore, the second indexing mechanism further includes a second rectangular box fixedly mounted on the second wedge plate, and a second friction strip is elastically and slidably mounted in the second rectangular box.

[0011] Furthermore, the top of the second friction strip consists of a horizontal surface and a trapezoidal surface.

[0012] Furthermore, a second damping plate is fixedly installed in the second rectangular box.

[0013] Furthermore, it also includes a positioning mechanism, which includes a ring. The outer walls of the first spline shaft and the second spline shaft are both slidably sleeved with the ring, and the ring is rotatably installed in the tool holder. The ring has a slide groove, and a positioning block is elastically slidably installed in the slide groove. A wave ring is provided on one side of the ring for use with the positioning block, and the wave ring is fixedly installed in the tool holder.

[0014] Furthermore, it also includes a switching mechanism for controlling the first indexing mechanism and the second indexing mechanism, the switching mechanism includes a sliding sleeve elastically slidably mounted on the tool holder, a first switching rod movably mounted in the tool holder, a first compression spring that is against the outer wall of the first switching rod is provided in the tool holder, a top shaft is fixedly mounted on the first switching rod, the top shaft is slidably mounted in the tool holder and used in conjunction with the first sliding rod, a second switching rod is provided in the sliding sleeve on the outer wall of the first switching rod, the second switching rod is slidably mounted in the tool holder and used in conjunction with the second sliding rod, a second compression spring that is against the outer wall of the second switching rod is provided in the tool holder, and the sliding sleeve has an F-shaped groove that is set through and used in conjunction with the first switching rod and the second switching rod.

[0015] The present invention has the following advantages: 1. The present invention can quickly complete the rotation of the first tool and the second tool through the design of the first rotation mechanism and the second rotation mechanism, without the need to remove the screws fixing the first tool and the second tool, thereby greatly improving work efficiency. Through the design of the first spline shaft and the second spline shaft, during the milling cutter processing, the first tool and the second tool can remain stable during the operation.

[0016] 2. The present invention designs a positioning mechanism so that the first spline shaft and the second spline shaft can be accurately inserted into the first spline groove and the second spline groove after rotation. Through the design of the switching mechanism, the first tool and the second tool can be individually adjusted by changing the positions of the first switching lever and the second switching lever. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 Schematic diagram of the structure of the first indexing mechanism of the present invention; Figure 3 This is a schematic diagram of the installation of the first wedge block of the present invention; Figure 4 This is a schematic diagram of the installation of the first wedge plate of the present invention; Figure 5 This is a schematic diagram of the installation of the first friction strip of the present invention; Figure 6 Schematic diagram of the structure of the second indexing mechanism of the present invention; Figure 7 This is a schematic diagram of the installation of the second damping plate of the present invention; Figure 8 This is a schematic diagram of the installation of the collar of the present invention; Figure 9 This is a schematic diagram of the installation of the positioning block of the present invention; Figure 10 This is a schematic diagram of the installation of the sliding sleeve of the present invention; Figure 11 Schematic diagram of the structure of the switching mechanism of the present invention; Figure 12 This is a schematic diagram of the installation of the second switching lever of the present invention.

[0018] In the above figures: 1: tool holder, 101: first tool, 102: second tool, 201: first spline shaft, 202: first wedge block, 301: first wedge plate, 302: first sliding rod, 401: first rectangular box, 402: first friction strip, 501: first damping plate, 601: second spline shaft, 602: second wedge block, 701: second wedge plate, 702: second sliding rod, 801: second rectangular box, 802: second friction strip, 901: second damping plate, 1001: collar, 1002: positioning block, 1003: wave ring, 1101: sleeve, 1102: first switching rod, 1103: top shaft, 1104: second switching rod. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1, a multi-edge indexable spiral groove milling cutter, such as Figures 1-4 As shown, it includes a tool holder 1, on which are provided two sets of staggered first tools 101 and second tools 102, each of which has four first tools 101 and four second tools 102. A first indexing mechanism for moving the first tool 101 is provided in the tool holder 1, and a second indexing mechanism for moving the second tool 102 is provided. The first indexing mechanism includes a first spline shaft 201, and the first spline shaft 201 is provided in a one-to-one correspondence with the first tool 101. The tool holder 1 has four first spline shafts for the first spline shaft. 201 is a first spline groove for sliding limitation, one end of the first spline shaft 201 is rotatably mounted with a first wedge block 202 elastically slidably mounted in the tool holder 1, one side of the first wedge block 202 is provided with a first wedge plate 301 used in conjunction therewith, when the first wedge plate 301 squeezes the first wedge block 202, the first spline shaft 201 can slide out of the first spline groove, a first sliding rod 302 is fixedly mounted on the first wedge plate 301, and the first wedge plate 301 and the first sliding rod 302 are both slidably mounted in the tool holder 1.

[0021] like Figure 5 As shown, the first indexing mechanism also includes a first rectangular box 401 fixedly mounted on one side of the first wedge plate 301, and a first friction strip 402 for use with the first spline shaft 201 is elastically and slidably mounted in the first rectangular box 401. The top of the first friction strip 402 is composed of a horizontal surface and a trapezoidal surface. When the first friction strip 402 contacts the first spline shaft 201, the first spline shaft 201 can be rotated.

[0022] like Figure 5 As shown, a first damping plate 501 is fixedly installed in the first rectangular box 401 , and the first damping plate 501 can apply a unidirectional friction force to the first friction strip 402 .

[0023] like Figure 6 and Figure 7As shown, the second indexing mechanism includes a second spline shaft 601, and the second spline shaft 601 is arranged in a one-to-one correspondence with the second tool 102. The tool holder 1 has four second spline grooves for the second spline shaft 601 to slide and limit. The first tool 101 and the second tool 102 are respectively fixed to the first spline shaft 201 and the second spline shaft 601 by bolts. One end of the second spline shaft 601 is rotatably installed with a second wedge block 602 elastically slidably installed in the tool holder 1. A second wedge plate 701 is provided on one side of the second wedge block 602 for use therewith. When the second wedge plate 701 squeezes the second wedge block 602, the second spline shaft 601 can slide out of the second spline groove. A second sliding rod 702 is fixedly installed on the second wedge plate 701. The second wedge plate 701 and the second sliding rod 702 are both slidably installed in the tool holder 1.

[0024] like Figure 6 and Figure 7 As shown, the second indexing mechanism also includes a second rectangular box 801 fixedly mounted on the second wedge plate 701, and a second friction strip 802 is elastically and slidably mounted in the second rectangular box 801. The top of the second friction strip 802 is composed of a horizontal surface and a trapezoidal surface. When the second friction strip 802 contacts the second spline shaft 601, the second spline shaft 601 can be rotated.

[0025] like Figure 7 As shown, a second damping plate 901 is fixedly installed in the second rectangular box 801 , and the second damping plate 901 can apply a unidirectional friction force to the second friction strip 802 .

[0026] In order to ensure that the first spline shaft 201 and the second spline shaft 601 can be accurately inserted into the first spline groove and the second spline groove after rotation, Figure 8 As shown, it also includes a positioning mechanism, which includes a ring 1001. The outer walls of the first spline shaft 201 and the second spline shaft 601 are both slidably sleeved with the ring 1001. The ring 1001 is rotatably installed in the tool holder 1. The ring 1001 has a slide groove, and a positioning block 1002 is elastically slidably installed in the slide groove. A wave ring 1003 is provided on one side of the ring 1001 for use with the positioning block 1002. The wave ring 1003 is fixedly installed in the tool holder 1. Through the cooperation between the positioning block 1002 and the wave ring 1003, it can be ensured that the angle between the first spline shaft 201 and the second spline shaft 601 is maintained at ninety degrees each time it rotates.

[0027] Initially, the first spline shaft 201 and the second spline shaft 601 are respectively inserted into the first spline groove and the second spline groove of the tool holder 1. When a milling cutter is used for processing, the first spline shaft 201 and the second spline shaft 601 can remain stable under the action of the first spline groove and the second spline groove to ensure the processing effect of the first tool 101 and the second tool 102.

[0028] Initially, there is a gap between the first friction strip 402 and the first spline shaft 201, and there is a gap between the second friction strip 802 and the second spline shaft 601. When the first tool 101 and the second tool 102 are worn, the first wedge plate 301 and the second wedge plate 701 are controlled to move toward the adjacent first wedge block 202 and the second wedge block 602. The first wedge plate 301 drives the first friction strip 402 to move through the first rectangular box 401 thereon, and the second wedge plate 701 drives the second friction strip 802 to move through the second rectangular box 801 thereon. The first wedge block 202 is forced to drive the first spline shaft 201 to disengage from the first spline groove of the tool holder 1, and the second wedge block 602 is forced to drive the second spline shaft 601 to disengage from the second spline groove of the tool holder 1. The first spline shaft 201 and the second spline shaft 601 respectively drive the first tool 101 and the second tool 102 thereon to move. At this time, the first friction strip 402 contacts the adjacent first spline shaft 201, and the first spline shaft 201 rotates under the action of the first friction strip 402. The second friction strip 802 contacts the adjacent second spline shaft 601. The second spline shaft 601 rotates under the action of the second friction strip 802. The first spline shaft 201 and the second spline shaft 601 respectively drive the first tool 101 and the second tool 102 to rotate. Then the trapezoidal surfaces of the first friction strip 402 and the second friction strip 802 respectively contact the outer walls of the first spline shaft 201 and the second spline shaft 601, and the first friction strip 402 and the second friction strip 802 elastically shrink and slide under force. At this time, the first damping plate 501 and the second damping plate 901 will not apply resistance to the first friction strip 402 and the second friction strip 802 until the first wedge plate 301 and the second wedge plate 701 stop moving. At this time, the first tool 101 and the second tool 102 are rotated ninety degrees and the indexing is completed. Then the first wedge block 202 begins to elastically release and slide back, and drives the first tool 101 to move through the first spline shaft 201. After the movement, the first spline shaft 201 is stuck in the first spline groove of the tool holder 1. At the same time, the first wedge block 202 pushes the first wedge plate 301 to slide back, and the first wedge plate 301 drives the first friction strip 402 to move through the first rectangular box 401 thereon. At the same time, the second wedge block 602 elastically releases and slides back, and drives the first tool 101 to move through the second spline shaft The shaft 601 drives the second tool 102 to move, and the second spline shaft 601 is stuck in the second spline groove of the tool holder 1 after movement. At the same time, the second wedge block 602 pushes the second wedge plate 701 to slide and reset. The second wedge plate 701 drives the second friction strip 802 to move through the second rectangular box 801 thereon. In the process of movement of the first rectangular box 401 and the second rectangular box 801, the first friction strip 402 and the second friction strip 802 are respectively elastically slid and reset under the action of the first damping plate 501 and the second damping plate 901, and gaps are generated between the first friction strip 402 and the second friction strip 802 and the first spline shaft 201 and the second spline shaft 601 respectively, thereby preventing the first wedge plate 301 and the second wedge plate 701 from resetting.The first friction strip 402 and the second friction strip 802 generate hard friction with the first spline shaft 201 and the second spline shaft 601 respectively, causing the first friction strip 402 and the second friction strip 802 to wear, thereby completing the indexing of the first tool 101 and the second tool 102, effectively improving the indexing efficiency.

[0029] When the first spline shaft 201 and the second spline shaft 601 move, the first spline shaft 201 and the second spline shaft 601 slide along the inner wall of the corresponding ring 1001. When the first spline shaft 201 and the second spline shaft 601 rotate, the ring 1001 rotates synchronously and drives the positioning block 1002 to move. The positioning block 1002 moves in accordance with the outer wall of the wave ring 1003 and is squeezed and elastically contracted by the wave ring 1003 to slide. Due to the angle of each rotation of the first spline shaft 201 and the second spline shaft 601, the first spline shaft 201 and the second spline shaft 601 rotate. Both are approximately ninety degrees. When the first friction strip 402 and the second friction strip 802 are no longer in contact with the first spline shaft 201 and the second spline shaft 601, the positioning block 1002 elastically slides back to its original position. By snapping the positioning block 1002 into the recess of the wave ring 1003, it can be ensured that the angle of each rotation of the first spline shaft 201 and the second spline shaft 601 is accurate to ninety degrees, so that the first spline shaft 201 and the second spline shaft 601 can be accurately snapped into the first spline groove and the second spline groove after rotation.

[0030] In embodiment 2, in order to improve the rotation flexibility of the first spline shaft 201 and the second spline shaft 601, as shown in FIG. Figure 10-12 As shown, it also includes a switching mechanism for controlling the first indexing mechanism and the second indexing mechanism, the switching mechanism includes a sliding sleeve 1101 elastically slidably installed on the tool holder 1 along the up and down directions, a first switching rod 1102 is movably installed in the tool holder 1, a first compression spring that is against the outer wall of the first switching rod 1102 is provided in the tool holder 1, a top shaft 1103 is fixedly installed on the bottom end of the first switching rod 1102, the top shaft 1103 is slidably installed in the tool holder 1 along the up and down directions, and is used in conjunction with the first sliding rod 302, the outer wall sliding sleeve of the first switching rod 1102 is provided with a second switching rod 1104, the second switching rod 1104 is slidably installed in the tool holder 1, and is used in conjunction with the second sliding rod 702, a second compression spring that is against the outer wall of the second switching rod 1104 is provided in the tool holder 1, and the sliding sleeve 1101 has an F-shaped groove that is set through and used in conjunction with the first switching rod 1102 and the second switching rod 1104.

[0031] Initially, the first switching rod 1102 and the second switching rod 1104 are both stuck in the vertical part of the F-shaped groove of the sleeve 1101. When the milling cutter processes the workpiece, the workpiece processing method will cause the feed depth of the milling cutter to be different, and the degree of wear of the first tool 101 and the second tool 102 will be different. When the first tool 101 and the second tool 102 both need to be indexed, the staff will push the end of the first switching rod 1102 and the second switching rod 1104 outside the sleeve 1101 to the left, so that the first switching rod 1102 and the second switching rod 1104 are in contact with the end of the F-shaped groove of the sleeve 1101, and then pull the sleeve 1101 downward. The sleeve 1101 squeezes the outer walls of the first switching rod 1102 and the second switching rod 1104 through the F-shaped groove. The rod 1104 slides downward under the force, the first compression spring and the second compression spring are contracted under the force, and the first switching rod 1102 drives the top shaft 1103 to slide downward, and the bottom ends of the top shaft 1103 and the second switching rod 1104 squeeze the ends of the first sliding rod 302 and the second sliding rod 702 respectively, and the first sliding rod 302 and the second sliding rod 702 are forced to move. The above steps realize the rotation of the first tool 101 and the second tool 102, and then the sleeve 1101 is released, and the sleeve 1101 slides elastically to reset, and drives the first switching rod 1102 and the second switching rod 1104 to reset synchronously. At this time, the top shaft 1103 and the second switching rod 1104 no longer squeeze the ends of the first sliding rod 302 and the second sliding rod 702, and the first wedge block 202 and the second wedge block 602 can be elastically reset.

[0032] When the first tool 101 needs to be indexed separately, only the end of the first switching rod 1102 located outside the sliding sleeve 1101 is pushed to the left, so that the first switching rod 1102 contacts the end of the F-shaped groove of the sliding sleeve 1101, and then the sliding sleeve 1101 is pulled downward. The sliding sleeve 1101 squeezes the outer wall of the first switching rod 1102 through the F-shaped groove, and then the bottom end of the top shaft 1103 squeezes the end of the first sliding rod 302 to achieve the indexing of the first tool 101. When the sliding sleeve 1101 slides, the F-shaped groove will not squeeze the outer wall of the second switching rod 1104. The second compression spring can provide support for the second switching rod 1104, and the second tool 102 will not be indexed. When rotating, only the end of the second switching rod 1104 located outside the sleeve 1101 is pushed to the left, so that the second switching rod 1104 contacts the end of the F-shaped groove of the sleeve 1101, and then the sleeve 1101 is pulled downward. The F-shaped groove of the sleeve 1101 squeezes the outer wall of the second switching rod 1104, and then the bottom end of the second switching rod 1104 squeezes the end of the second sliding rod 702 to realize the rotation of the second tool 102. When the sleeve 1101 slides, it will not squeeze the outer wall of the first switching rod 1102. The first compression spring can provide support for the first switching rod 1102, and the first tool 101 will not rotate, thereby realizing the separate rotation of the first tool 101 and the second tool 102.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A multi-blade indexable spiral groove milling cutter, comprising a tool holder (1), wherein the tool holder (1) is provided with two sets of staggered first tools (101) and second tools (102), characterized in that: The tool holder (1) is provided with a first transfer mechanism for moving the first tool (101), and a second transfer mechanism for moving the second tool (102), the first transfer mechanism including a first spline shaft (201), the tool holder (1) having a first spline groove for slidingly limiting the first spline shaft (201), a first wedge block (202) elastically slidably mounted in the tool holder (1) is rotatably mounted on the first spline shaft (201), a first wedge plate (301) for use with the first wedge block (202) is provided on one side, a first sliding rod (302) is fixedly mounted on the first wedge plate (301), and the first wedge plate (301) and the first sliding rod (302) are both slidably mounted in the tool holder (1).

2. A multi-edge indexable spiral groove milling cutter according to claim 1, characterized in that: The first indexing mechanism further comprises a first rectangular box (401) fixedly mounted on the first wedge plate (301), a first friction strip (402) being elastically slidably mounted in the first rectangular box (401), and the first friction strip (402) being used in conjunction with the first spline shaft (201).

3. A multi-edge indexable spiral groove milling cutter according to claim 2, characterized in that: The top of the first friction strip (402) consists of a horizontal surface and a trapezoidal surface.

4. A multi-edge indexable spiral groove milling cutter according to claim 2, characterized in that: A first damping plate (501) is fixedly installed in the first rectangular box (401).

5. The multi-edge indexable spiral groove milling cutter according to claim 1, characterized in that: The second indexing mechanism includes a second spline shaft (601), the tool holder (1) has a second spline groove for slidingly limiting the second spline shaft (601), the second wedge block (602) elastically slidably mounted in the tool holder (1) is rotatably mounted on the second spline shaft (601), a second wedge plate (701) for use with the second wedge block (602) is provided on one side of the second wedge block (602), a second sliding rod (702) is fixedly mounted on the second wedge plate (701), and the second wedge plate (701) and the second sliding rod (702) are both slidably mounted in the tool holder (1).

6. A multi-edge indexable spiral groove milling cutter according to claim 5, characterized in that: The second indexing mechanism further comprises a second rectangular box (801) fixedly mounted on the second wedge plate (701), and a second friction strip (802) is elastically and slidably mounted in the second rectangular box (801).

7. A multi-edge indexable spiral groove milling cutter according to claim 6, characterized in that: The top of the second friction strip (802) consists of a horizontal surface and a trapezoidal surface.

8. The multi-edge indexable spiral groove milling cutter according to claim 6, characterized in that: A second damping plate (901) is fixedly installed in the second rectangular box (801).

9. The multi-edge indexable spiral groove milling cutter according to claim 5, characterized in that: The tool holder (1) further comprises a positioning mechanism, the positioning mechanism comprising a collar (1001), the outer walls of the first spline shaft (201) and the second spline shaft (601) are both slidably sleeved with the collar (1001), the collar (1001) is rotatably mounted in the tool holder (1), the collar (1001) is provided with a slide groove, a positioning block (1002) is elastically slidably mounted in the slide groove, a wave ring (1003) for use with the positioning block (1002) is provided on one side of the collar (1001), and the wave ring (1003) is fixedly mounted in the tool holder (1).

10. The multi-edge indexable spiral groove milling cutter according to claim 5, characterized in that: The invention also includes a switching mechanism for controlling the first indexing mechanism and the second indexing mechanism, wherein the switching mechanism includes a sliding sleeve (1101) elastically slidably mounted on the tool holder (1), a first switching rod (1102) movably mounted in the tool holder (1), a first compression spring abutting against the outer wall of the first switching rod (1102) is provided in the tool holder (1), a top shaft (1103) is fixedly mounted on the first switching rod (1102), the top shaft (1103) is slidably mounted in the tool holder (1) and is in contact with the first sliding rod. (302), the outer wall sliding sleeve of the first switching rod (1102) is provided with a second switching rod (1104), the second switching rod (1104) is slidably installed in the tool holder (1) and is used in conjunction with the second sliding rod (702), and a second compression spring is provided in the tool holder (1) to abut against the outer wall of the second switching rod (1104), and the sliding sleeve (1101) has an F-shaped groove which is set through and is used in conjunction with the first switching rod (1102) and the second switching rod (1104).

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