Adjustable power tool apron and tool turret device
By introducing a crankshaft mechanism into the turret device, fine-tuning of the power tool seat and the cutting plate is achieved, the position deviation problem during installation is solved, and the processing quality and equipment stability are improved.
Patent Information
- Application Number
- CN202510453263.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2025-07-11
AI Technical Summary
The existing turret device has a slight position deviation when installing the power tool holder and the cutter plate, which affects the processing quality, tool life and equipment stability.
By setting up a crankshaft mechanism, including a guide block and an eccentric wheel, fine adjustment of the power tool seat against the cutter plate is achieved to eliminate position deviation.
Effectively eliminate slight position deviations between the power tool holder and the cutting plate, and improve processing quality, tool life and equipment stability.
Smart Images

Figure CN120286738A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of machining, and particularly relates to an adjustable power tool holder. Background Art
[0002] The turret device is an important machine tool accessory that can automatically switch tools according to a program to meet the different machining requirements of workpieces. The turret device includes a power tool holder and a turret. A cylinder body is provided on the power tool holder, and the turret is provided with a mounting hole corresponding to the cylinder body. During installation, the cylinder body is inserted into the mounting hole to position the power tool holder on the turret, and then bolts are screwed between the power tool holder and the turret to fix the tool holder. However, during actual installation, there is a clearance fit between the cylinder body and the mounting hole. Although the turret can position the power tool holder with high precision, there is still a slight positional deviation in the actual power tool holder, which is likely to affect the machining quality, tool life, and equipment stability after long-term use.
[0003] Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Invention
[0004] The purpose of the present invention is to provide an adjustable power tool holder and a turret device. When the power tool holder is installed on the turret, its position can be adjusted relative to the turret to eliminate the positional deviation between the two.
[0005] The purpose of the present invention is achieved through the following technical solutions: An adjustable power tool holder includes:
[0006] A tool holder body placed on the mounting surface on the periphery of the turret;
[0007] An output shaft installed on the tool holder body, the axis of which is perpendicular to the mounting surface or parallel to the axis of the turret;
[0008] A crankshaft mechanism including a guide block and a crankshaft. The guide block is located on one side of the tool holder body in the axial direction of the turret and is movably connected to the tool holder body. The guide block is formed with a first guide hole penetrating along the axial direction of the turret. The crankshaft includes a shaft body rotatably passing through the first guide hole and an eccentric wheel eccentrically connected to one end of the shaft body;
[0009] Wherein, a transmission hole adapted to the eccentric wheel is formed by inward depression on the side surface of the tool holder body facing the guide block. The eccentric wheel is rotatably embedded in the transmission hole. When the tool holder body is placed on the mounting surface, the eccentric wheel drives the tool holder body to move along the radial direction of the turret parallel to the mounting surface in response to the rotation of the shaft body, and makes the projections of the axes of the output shaft and the turret coincide in the direction perpendicular to the mounting surface.
[0010] Furthermore, the other end of the crankshaft extends out of the first guiding hole and is provided with a first cap portion.
[0011] Furthermore, a flange portion for fitting with the mounting surface is formed on one side of the tool holder body. A cylinder is protruded from the flange surface of the flange portion fitting with the mounting surface. An installation hole is formed by the mounting surface being recessed inward along the radial direction of the tool disc. The cylinder is in plug-in fit with the installation hole.
[0012] Furthermore, the first guiding hole is an elliptical hole, its major axis is perpendicular to the mounting surface, and its minor axis is adapted to the shaft body.
[0013] Furthermore, a second guiding hole is formed through the guiding block along the axial direction of the tool disc. The crankshaft mechanism includes a guiding bolt passing through the second guiding hole. The guiding bolt is threadedly connected with the tool holder body. A second cap portion is provided at one end of the guiding bolt. The guiding block is limited between the tool holder body and the second cap portion.
[0014] Furthermore, the second guiding hole is a strip-shaped hole, its length direction is parallel to the adjusting direction of the tool holder body, and the second guiding hole is adapted to guide the movement of the tool holder body.
[0015] Furthermore, the number of the second guiding holes is two, and they are respectively arranged on both sides of the guiding block along the adjusting direction of the tool holder body. The guiding bolts correspond to the second guiding holes one by one. The first guiding hole is located between the two second guiding holes.
[0016] Furthermore, the crankshaft mechanism includes a positioning pin inserted on the guiding block. A part of the positioning pin protrudes relative to the flange surface. A positioning hole is formed by the mounting surface being recessed inward. After the tool holder body is docked with the tool disc, the protruding part of the positioning pin is embedded and positioned in the positioning hole, and the guiding block is restricted from moving along the radial direction of the positioning hole.
[0017] Furthermore, a pin hole is formed by the side of the guiding block facing the mounting surface being recessed inward. The positioning pin is fixedly passed through the pin hole. A third cap portion of the positioning pin protrudes relative to the flange surface and is adapted to the positioning hole.
[0018] In addition, the present invention further provides a turret device, characterized in that
[0019] the aforementioned adjustable power tool holder;
[0020] a tool disc, the outer peripheral contour of which is a polygonal structure to form a plurality of the mounting surfaces, and each of the mounting surfaces is recessed with an installation hole;
[0021] Among them, there are multiple adjustable power tool holders, and they correspond to the mounting surface one by one.
[0022] Compared with the prior art, the present invention has the following beneficial effects: By arranging a crankshaft mechanism, when the tool holder body is placed on the mounting surface of the tool disc, by rotating the shaft body of the crankshaft, the eccentric wheel can drive the tool holder body to slightly move and adjust relative to the tool disc, so that the projections of the output shaft and the axis of the tool disc in the direction perpendicular to the mounting surface coincide, effectively eliminating the tiny position deviation between the power tool holder and the tool disc, and effectively improving the machining quality, tool life and equipment stability. Description of the Drawings
[0023] Figure 1 is a schematic structural diagram of the turret device of the present invention.
[0024] Figure 2 is an exploded structural diagram of the turret device of the present invention.
[0025] Figure 3 is an exploded structural diagram of the power tool holder of the present invention.
[0026] Figure 4 is a schematic structural diagram of the power tool holder of the present invention.
[0027] Description of the Reference Numerals:
[0028] 100, tool holder body; 110, transmission hole; 120, flange part; 121, flange surface; 122, first connection hole; 130, cylinder body; 140, locking bolt; 150, second connection hole; 160, mounting groove; 200, output shaft; 300, input shaft; 400, crankshaft mechanism; 410, guide block; 411, first guide hole; 412, second guide hole; 413, first surface; 414, second surface; 415, third surface; 416, pin hole; 420, crankshaft; 421, shaft body; 422, eccentric wheel; 423, first cap part; 430, guiding bolt; 431, second cap part; 440, positioning pin; 441, third cap part; 500, tool disc; 510, mounting surface; 520, mounting hole; 530, docking hole; 540, positioning hole. Detailed Embodiments
[0029] To make the above objects, features and advantages of the present application more obvious and understandable, the following will describe the detailed embodiments of the present application in conjunction with the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. Additionally, it should be noted that for the sake of convenience of description, only parts related to the present application are shown in the drawings rather than all the structures. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0030] The terms "comprising" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.
[0031] The mention of "embodiment" in this context means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.
[0032] Please refer to Figures 1 to 4 As shown, the adjustable power tool post corresponding to a preferred embodiment of the present invention includes: a tool post body 100 placed on the mounting surface 510 on the circumferential side of the tool disc 500; an output shaft 200 installed on the tool post body 100, the axis of which is perpendicular to the mounting surface 510 or parallel to the axis of the tool disc 500; a crankshaft mechanism 400 including a guide block 410 and a crankshaft 420. The guide block 410 is located on one side of the tool post body 100 in the axial direction of the tool disc 500 and is movably connected to the tool post body 100. The guide block 410 is formed with a first guide hole 411 penetrating along the axial direction of the tool disc 500. The crankshaft 420 includes a shaft body 421 rotatably passing through the first guide hole 411 and an eccentric wheel 422 eccentrically connected to one end of the shaft body 421. Wherein, a transmission hole 110 adapted to the eccentric wheel 422 is recessed inwardly on the side surface of the tool post body 100 facing the guide block 410. The eccentric wheel 422 is rotatably embedded in the transmission hole 110. When the tool post body 100 is placed on the mounting surface 510, the eccentric wheel 422 drives the tool post body 100 to move radially parallel to the mounting surface 510 of the tool disc 500 in response to the rotation of the shaft body 421, and makes the projections of the axes of the output shaft 200 and the tool disc 500 coincide in the direction perpendicular to the mounting surface 510.
[0033] By setting the crankshaft mechanism 400 in the present invention, after the tool post body 100 is placed on the mounting surface 510 of the tool disc 500, by rotating the shaft body 421 of the crankshaft 420, the eccentric wheel 422 can drive the tool post body 100 to perform fine displacement adjustment relative to the tool disc 500, so that the projections of the axes of the output shaft 200 and the tool disc 500 coincide in the direction perpendicular to the mounting surface 510, effectively eliminating the small positional deviation between the power tool post and the tool disc 500, and effectively improving the machining quality, tool life, and equipment stability.
[0034] Further, the axial direction of the cutter head 500 refers to the direction of its rotation axis. The mounting surface 510 is recessed inward along the radial direction of the cutter head 500 to form a mounting hole 520. One side of the tool holder body 100 is formed with a flange portion 120 for fitting with the mounting surface 510. The flange portion 120 has a flange surface 121 that fits with the mounting surface 510. A cylinder body 130 protrudes from the flange surface 121, and the cylinder body 130 is inserted and fitted with the mounting hole 520.
[0035] In addition, a plurality of first connection holes 122 are evenly distributed around the flange portion 120. The axial direction of the first connection holes 122 is perpendicular to the mounting surface 510. A locking bolt 140 is inserted through the first connection holes 122. Corresponding docking holes 530 are provided on the mounting surface 510 of the cutter head 500. The locking bolt 140 is threadedly connected between the first connection holes 122 and the docking holes 530 to realize the fastening of the tool holder body 100 and the cutter head 500. When there is a deviation between the tool holder body 100 and the cutter head 500, the locking bolt 140 can be first screwed away from the flange portion 120, and then the crankshaft 420 is rotated. The tool holder body 100 is adapted to move along the radial direction of the cutter head 500 parallel to the mounting surface 510 under the drive of the eccentric wheel 422, so that the axes of the output shaft 200 and the cutter head 500 coincide in the projection of the cutter head 500 in the radial direction parallel to the axial direction of the cylinder body 130.
[0036] Further, in this embodiment, the axial direction of the output shaft 200 is parallel to the axial direction of the cutter head 500. The output end of the output shaft 200 extends out of the tool holder body 100 on the other side in the axial direction of the cutter head 500 for tool connection. By adopting the above arrangement, the tools on the crankshaft mechanism 400 and the output shaft 200 can be prevented from limiting each other. An input shaft 300 that is in transmission cooperation with the output shaft 200 is coaxially provided in the cylinder body 130. Specifically, a transmission structure can be provided inside the tool holder body 100 to make the input shaft 300 and the output shaft 200 in transmission connection. After the power tool holder is docked with the cutter head 500, the input shaft 300 can also be in transmission connection with the cutter head 500 to make the cutter head 500 drive the output shaft 200 to rotate. This is a well-known structure in the art and will not be elaborated in the present invention.
[0037] Further, the outer contour of the eccentric wheel 422 is circular, its outer diameter is larger than that of the shaft body 421, the eccentric wheel 422 has a protruding end away from the shaft body 421, the transmission hole 110 is a circular hole adapted to the eccentric wheel 422, the transmission hole 110 is located in the middle area of the tool holder body 100 in the adjustment direction and is close to the flange portion 120. The other end of the crankshaft 420 away from the eccentric wheel 422 extends out of the first guiding hole 411 and is provided with a first cap portion 423. The outer contour of the first cap portion 423 is a polygonal structure, which is convenient for the debugging personnel to dock with the crankshaft 420 through tools such as a wrench and rotate the crankshaft 420. The outer peripheral contour of the first cap portion 423 does not protrude relative to the outer periphery of the shaft body 421 so as not to hinder the installation of the crankshaft 420 in the first guiding hole 411.
[0038] Preferably, the first guiding hole 411 is located in the middle area of the guiding block 410 in the adjustment direction of the tool holder body 100. The first guiding hole 411 is an elliptical hole, its major axis is perpendicular to the mounting surface 510, and its minor axis is adapted to the shaft body 421. Since the tool holder body 100 usually moves along the rotation track of the eccentric wheel 422 during the rotation of the shaft body 421, by adopting the elliptical first guiding hole 411, the shaft body 421 can move along the major axis direction of the first guiding hole 411, thereby eliminating the movement of the tool holder body 100 in the direction perpendicular to the mounting surface 510, so that it can only move radially parallel to the mounting surface 510 of the tool disc 500, ensuring that the tool holder body 100 can always be closely attached to the mounting surface 510 during the adjustment process, which is convenient for subsequent fastening by the locking bolt 140. When the protruding end of the eccentric wheel 422 rotates to the distal end away from the mounting surface 510, the shaft body 421 is in contact with the side of the first guiding hole 411 close to the mounting surface 510. When the protruding end of the eccentric wheel 422 rotates to the proximal end close to the mounting surface 510, the shaft body 421 is in contact with the side of the first guiding hole 411 away from the mounting surface 510.
[0039] Further, the guiding block 410 is axially penetrated with a second guiding hole 412 along the tool disc 500. The crankshaft mechanism 400 includes a guiding bolt 430 passing through the second guiding hole 412. The tool holder body 100 is concavely provided with a second connecting hole 150 on the side facing the guiding block 410. The guiding bolt 430 is threadedly connected with the tool holder body 100 through the second connecting hole 150. One end of the guiding bolt 430 is provided with a second cap portion 431. The guiding block 410 is limited between the tool holder body 100 and the second cap portion 431, thereby ensuring the reliable installation of the guiding block 410 and the tool holder body 100.
[0040] The second guiding hole 412 is a strip-shaped hole, and its length direction is parallel to the adjustment direction of the tool holder body 100. The guiding bolt 430 can move along the length direction of the second guiding hole 412, so that the second guiding hole 412 can guide the tool holder body 100 to move along the preset adjustment direction. The number of the second guiding holes 412 is two, and they are respectively arranged on both sides of the guiding block 410 along the adjustment direction of the tool holder body 100. The guiding bolts 430 correspond to the second guiding holes 412 one by one, and the first guiding hole 411 is located between the two second guiding holes 412.
[0041] In this embodiment, the guiding block 410 has a first surface 413 and a second surface 414 perpendicular to the axial direction of the tool disc 500. The first surface 413 faces the tool holder body 100, and the second surface 414 faces away from the tool holder body 100. The first guiding hole 411 and the second guiding hole 412 both penetrate from the first surface 413 to the second surface 414. When the guiding bolt 430 is tightened in place, the first surface 413 can be in contact with the tool holder body 100 or have a certain gap, and the second surface 414 can be in contact with the second cap portion 431 or have a certain gap.
[0042] Preferably, an installation groove 160 is formed by inwardly recessing the side surface of the tool holder body 100 in the axial direction of the tool disc 500. The guiding block 410 is received in the installation groove 160 and is limited between the bottom of the installation groove 160 and the first cap portion 423 of the guiding bolt 430. The installation groove 160 is a through structure in the direction perpendicular to the installation surface 510, and the transmission hole 110 and the second connection hole 150 are both recessed in the bottom of the installation groove 160. By providing the installation groove 160, the space between the crankshaft mechanism 400 and the tool holder body 100 can be made more compact, reducing the occupied space. In the adjustment direction of the tool holder body 100, the size of the installation groove 160 is larger than the size of the guiding block 410, so as to prevent the installation groove 160 from hindering the translational adjustment of the tool holder body 100.
[0043] Further, the guiding block 410 has a third surface 415 facing the mounting surface 510. The third surface 415 does not protrude relative to the flange surface 121 and is preferably flush therewith to ensure that the flange surface 121 can be reliably attached to the mounting surface 510. The crankshaft mechanism 400 includes a positioning pin 440 inserted on the guiding block 410. A part of the positioning pin 440 protrudes relative to the flange surface 121. The mounting surface 510 is recessed inward to form a positioning hole 540. After the tool holder body 100 is docked with the tool disc 500, the protruding part of the positioning pin 440 is inserted and positioned in the positioning hole 540, and the guiding block 410 is restricted from moving radially along the positioning hole 540, ensuring that the guiding block 410 can reliably guide the rotation of the crankshaft 420 and guide the translation adjustment of the tool holder body 100. At the same time, the setting of the positioning pin 440 can also play an anti-misalignment role, enabling the tool holder body 100 to be accurately placed on the mounting surface 510. Specifically, the third surface 415 is recessed inward to form a pin hole 416. The pin hole 416 is preferably located in the middle area of the guiding block 410 in the adjustment direction of the tool holder body 100. The positioning pin 440 is fixedly inserted through the pin hole 416. The positioning pin 440 has a third cap portion 441. The third cap portion 441 protrudes relative to the flange surface 121 and is adapted to the positioning hole 540. The positioning pin 440 and the cylinder body 130 can cooperate to position the tool holder body 100, avoiding the axial direction of the output shaft 200 not being parallel to the axial direction of the tool disc 500 due to an angular deviation thereof. Preferably, the cross-section of the guiding block 410 perpendicular to the axial direction of the tool disc 500 is in a T shape to reasonably arrange the positioning pin 440, the guiding bolt 430, and the crankshaft 420 in a limited space.
[0044] Further, when installing the crankshaft mechanism 400, the positioning pin 440 can be first fixed on the guiding block 410, then the guiding bolt 430 is inserted into the second guiding hole 412 from the second surface 414, and the end of the crankshaft 420 provided with the first cap portion 423 is inserted through the first guiding hole 411 from the first surface 413. Then, the guiding block 410 is moved to insert the eccentric wheel 422 into the transmission hole 110. At the same time, the second connection hole 150 corresponds to the guiding bolt 430. Finally, the guiding bolt 430 is screwed into the second connection hole 150 until it is tightened, realizing the axial limit of the guiding block 410 and the crankshaft 420 on the tool disc 500.
[0045] Further, the present invention also provides a turret device, including the aforementioned adjustable power tool holder and the tool disc 500. The outer peripheral contour of the tool disc 500 is in a polygonal structure to form a plurality of mounting surfaces 510. Each mounting surface 510 is recessed with a mounting hole 520. The number of power tool holders is multiple and corresponds to the mounting surfaces 510 one by one.
[0046] The installation process of the adjustable power tool holder of the present invention and the tool disc 500 is as follows. First, align the positioning pin 440 at the crankshaft mechanism 400 with the pin hole 416 on the tool disc 500. Then insert the tool holder body 100 into the installation hole 520 of the tool disc 500 until the flange portion 120 is in contact with the installation surface 510 and the positioning pin 440 is inserted into the pin hole 416. When the axes of the output shaft 200 on the tool holder body 100 and the tool disc 500 do not coincide in the projection perpendicular to the installation surface 510, rotate the crankshaft 420. The eccentric wheel 422 of the crankshaft 420 can drive the tool holder body 100 to finely adjust radially parallel to the installation surface 510 of the tool disc 500 so that the axes of the output shaft 200 and the tool disc 500 coincide in projection. After the adjustment is completed, screw the locking bolt 140 into the space between the flange portion 120 and the tool disc 500 to lock the power tool holder. Since the tool holder body 100 is usually finely adjusted by only a fraction of a millimeter, it will not affect the installation of the locking bolt 140.
[0047] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.
Claims
1. An adjustable power tool post, characterized in that, Comprising: A tool holder body (100), placed on the mounting surface (510) on the circumferential side of the tool disc (500); An output shaft (200), mounted on the tool holder body (100), the axis of which is perpendicular to the mounting surface (510) or parallel to the axis of the tool disc (500); A crankshaft mechanism (400), including a guide block (410) and a crankshaft (420), the guide block (410) is located on one side of the tool holder body (100) in the axial direction of the tool disc (500) and is movably connected to the tool holder body (100). A first guide hole (411) is formed through the guide block (410) along the axial direction of the tool disc (500). The crankshaft (420) includes a shaft body (421) rotatably passing through the first guide hole (411) and an eccentric wheel (422) eccentrically connected to one end of the shaft body (421); Wherein, a transmission hole (110) adapted to the eccentric wheel (422) is formed by inwardly recessing the side surface of the tool holder body (100) facing the guide block (410). The eccentric wheel (422) is rotatably embedded in the transmission hole (110). When the tool holder body (100) is placed on the mounting surface (510), the eccentric wheel (422) drives the tool holder body (100) to move along the radial direction of the tool disc (500) parallel to the mounting surface (510) in response to the rotation of the shaft body (421), and makes the projections of the axes of the output shaft (200) and the tool disc (500) coincide in the direction perpendicular to the mounting surface (510).
2. The adjustable power tool post according to claim 1, wherein The other end of the crankshaft (420) extends out of the first guide hole (411) and is provided with a first cap portion (423).
3. The adjustable power tool holder according to claim 1, wherein, A flange portion (120) for fitting with the mounting surface (510) is formed on one side of the tool holder body (100). A cylinder body (130) protrudes from the flange surface (121) of the flange portion (120) that fits with the mounting surface (510). The mounting surface (510) is recessed inward along the radial direction of the tool disc (500) to form a mounting hole (520). The cylinder body (130) is inserted and matched with the mounting hole (520).
4. The adjustable power tool holder according to claim 1, wherein, The first guide hole (411) is an elliptical hole, its major axis is perpendicular to the mounting surface (510), and its minor axis is adapted to the shaft body (421).
5. The adjustable power tool rest according to claim 1, wherein A second guide hole (412) is formed through the guide block (410) along the axial direction of the tool disc (500). The crankshaft mechanism (400) includes a guiding bolt (430) passing through the second guide hole (412). The guiding bolt (430) is threadedly connected to the tool holder body (100). One end of the guiding bolt (430) is provided with a second cap portion (431). The guide block (410) is limited between the tool holder body (100) and the second cap portion (431).
6. The adjustable power tool post according to claim 5, wherein The second guide hole (412) is a strip-shaped hole, the length direction of which is parallel to the adjustment direction of the tool holder body (100). The second guide hole (412) is adapted to guide the movement of the tool holder body (100).
7. The adjustable power tool post according to claim 5, wherein, The number of the second guiding holes (412) is two, and the second guiding holes are respectively arranged on two sides of the guiding block (410) along the adjusting direction of the tool holder body (100). The guiding bolts (430) correspond to the second guiding holes (412) one by one, and the first guiding hole (411) is located between the two second guiding holes (412).
8. The adjustable power tool post according to claim 3, wherein, The crankshaft mechanism (400) includes a positioning pin (440) inserted on the guiding block (410). A part of the positioning pin (440) protrudes relative to the flange surface (121). A positioning hole (540) is formed by inward depression of the mounting surface (510). After the tool holder body (100) is docked with the tool disc (500), the protruding part of the positioning pin (440) is embedded and positioned in the positioning hole (540), and the guiding block (410) is restricted from moving radially along the positioning hole (540).
9. The adjustable power tool rest according to claim 8, characterized in that, One side of the guiding block (410) facing the mounting surface (510) is inwardly depressed to form a pin hole (413). The positioning pin (440) is fixedly arranged through the pin hole (413). A third cap portion (441) of the positioning pin (440) protrudes relative to the flange surface (121) and is adapted to the positioning hole (540).
10. A turret device, characterized in that, Comprising: The adjustable power tool holder according to any one of claims 1 to 9; A tool disc (500) with a polygonal structure on the outer peripheral contour to form a plurality of the mounting surfaces (510), and each mounting surface (510) is recessed with a mounting hole (520); Wherein, the number of the adjustable power tool holders is multiple and corresponds to the mounting surfaces (510) one by one.