Floating tool holder for woodworking machines

Abstract

The present application is a kind of floating tool holder for woodworking machinery, including tool holder, pull pin connected to the upper end of the tool holder, tool shaft connected to the lower end of the tool holder, tool holder hollow cavity inside the tool holder, tool shaft inserted into the tool holder hollow cavity and movably connected with the tool holder, tool shaft has up and down displacement space in the tool holder hollow cavity, spring element is arranged in the tool holder hollow cavity, bearing seat is arranged at the lower end of the tool shaft, rotary bearing is arranged in the bearing seat, shaft sleeve matched with the rotary bearing is arranged at the lower end of the tool shaft, the tool shaft is connected with the rotary bearing through the shaft sleeve to realize the connection with the bearing seat, and the slag outlet is arranged on the side wall of the bearing seat. When the present application is used, the milling groove movement is floating feed, the tool shaft can fluctuate up and down with the unevenness of the working surface to ensure that the groove depth of the feed machining is consistent, greatly improves the mortise and tenon jointing precision, and also reduces the wear of the milling cutter.

Description

Technical Field

[0001] This invention relates to a floating tool holder for woodworking machinery, belonging to the field of woodworking machinery technology. Background Technology

[0002] In the woodworking industry, furniture made using traditional mortise and tenon joinery techniques has advantages such as a tight and sturdy structure, aesthetic appeal, and durability. Mortise and tenon joinery requires extremely high precision in machining, but existing woodworking machinery, such as dovetail milling machines for panel furniture and dovetail groove cutting machines, suffers from various technical shortcomings, including cumbersome manufacturing processes, low processing precision, and low production efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a floating tool holder for woodworking machinery with a novel structure and high machining precision.

[0004] The technical solution of the present invention is: a floating tool holder for woodworking machinery, including a tool holder, a pull pin connected to the upper end of the tool holder, a tool shaft connected to the lower end of the tool holder, a hollow cavity inside the tool holder, a slot at the upper end of the tool shaft, a pin hole on the side wall of the tool holder corresponding to the slot hole, a pin inserted into the pin hole and the slot hole, the tool shaft inserted into the hollow cavity of the tool holder and movably connected to the tool holder through the pin, the diameter of the pin is smaller than the diameter of the pin hole and the slot hole, that is, the pin has a displacement space to move up and down in the pin hole and the slot hole, so that the tool shaft has a displacement space to move up and down in the hollow cavity of the tool holder; A spring element is provided in the hollow cavity of the tool holder. The upper end of the spring element is connected to the top of the hollow cavity of the tool holder, and the lower end of the spring element is connected to the top of the tool shaft. A bearing housing is provided at the lower end of the cutter shaft, and a rotary bearing is provided inside the bearing housing. The rotary bearing is located in the bearing cavity of the bearing housing and is fixedly connected to the bearing housing. A bushing matching the rotary bearing is provided at the lower end of the cutter shaft. The lower end of the cutter shaft is connected to the bearing housing through the bushing and the rotary bearing. The cutter shaft can rotate freely relative to the bearing housing through the rotary bearing. A slag outlet is provided on the side wall of the bearing housing.

[0005] Furthermore, a bushing is provided at the lower end of the hollow cavity of the tool holder, the bushing is fixedly connected to the tool holder, and a bushing hollow cavity is provided in the middle of the bushing, through which the tool shaft passes and is movably connected to the tool holder.

[0006] Furthermore, the bushing is made of a wear-resistant material.

[0007] Furthermore, a grinding block is connected to the lower end of the bearing housing.

[0008] Furthermore, the grinding block is made of a wear-resistant material.

[0009] Furthermore, a connecting member is provided on the side wall of the bearing housing, and a through hole is provided on the connecting member, which communicates with the interior of the bearing housing. An external vent pipe is connected to the through hole of the connecting member.

[0010] In existing woodworking machinery, the milling cutter shank and shaft are fixed and cannot be adjusted after the angle and height are set. The feed height cannot be adjusted vertically. Since the boards or strips to be processed often have slight bends or curvatures, the milled grooves will have varying depths. This not only reduces the accuracy of mortise and tenon joints, affecting the aesthetics and lifespan of the furniture, but also increases the wear rate of the milling cutter. The key design feature of this invention is to improve the milling operation in existing woodworking machinery from a fixed feed to a floating feed. A hollow cavity and elastic structure are incorporated within the shank, allowing the cutter shaft to move vertically within the hollow cavity. During the feed process, the cutter shaft can move up and down with the unevenness of the working surface (the surface of the board to be processed), ensuring consistent groove depth and significantly improving the accuracy of mortise and tenon joints while reducing wear on the milling cutter. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded view of the structure of the present invention; Figure 3 This is another structural schematic diagram of the present invention.

[0012] Explanation of reference numerals in the attached figures: 1 rivet, 2. Tool holder, 201. Hollow cavity of the tool holder, 202. Pin hole, 203. Spring element, 204. Screw hole, 205. Upper protrusion. 3. Bushing, 301 bushing with hollow cavity. 4 pins, 5. Tool shaft, 501 slot, 502 external thread, 503 lower protrusion, 504 bushing, 505 pressure plate. 6. Upper baffle 7. Nut, 701. Lower baffle, 702. Internal thread, 703. Rotary bearing. 8. Bearing housing; 801. Inner top surface; 802. Slag outlet; 803. Connecting component; 804. Through hole; 805. External vent pipe. 9 grinding blocks.

[0013] The present invention will now be explained in detail with reference to the accompanying drawings and embodiments. Detailed Implementation

[0014] See Figure 1 , Figure 2A floating tool holder for woodworking machinery includes a tool holder 2, with a pull stud 1 threadedly connected to the upper end of the tool holder 2 for connection to a machining center; a hollow cavity 201 is provided inside the tool holder 2, with a through hole from the lower end of the hollow cavity 201 to the bottom of the tool holder 2; a bushing 3, made of wear-resistant graphite, is installed at the lower end of the hollow cavity 201 and is fixedly connected to the tool holder 2; several screw holes 204 are provided on the lower side wall of the hollow cavity 201 to fix the bushing 3 to the tool holder 2 using screws; a tool shaft 5 is installed inside the hollow cavity 201, with a slot 501 at the upper end of the tool shaft 5, and a pin hole 202 corresponding to the slot 501 on the side wall of the tool holder 2; the tool shaft 5 first passes through the hollow cavity 301 of the bushing and then inserts into the hollow cavity 201 of the tool holder; a pin 4 is inserted into the pin hole 202 and the slot 501, allowing the tool shaft 5 to pass through the hollow cavity 301 of the bushing. The tool shaft 5 is movably connected to the tool holder 2 via pin 4. The diameter of pin 4 should be smaller than the diameter of pin hole 202 and slot hole 501, meaning that pin 4 has a displacement space that can move up and down within pin hole 202 and slot hole 501. In other words, the tool shaft 5 has a displacement space that can move up and down within the hollow cavity 201 of the tool holder. This displacement space can be set to approximately 5mm. After the tool shaft 5 is installed into the tool holder 2, there is still a space between the top of the tool shaft 5 and the top of the hollow cavity 201 of the tool holder. An elastic element 203, such as a compression spring, is installed in this space. The upper end of the compression spring is connected to the top of the hollow cavity 201 of the tool holder, and the lower end of the compression spring is connected to the top of the tool shaft 5. An upper protrusion 205 can be set at the top of the hollow cavity 201 of the tool holder, and a lower protrusion 503 can be set at the top of the tool shaft 5. The compression spring is installed using the upper protrusion 205 and the lower protrusion 503.

[0015] To better utilize the floating tool holder of the present invention, a bearing seat 8 is also provided at the lower end of the tool shaft 5, such as... Figure 1 , Figure 2As shown, a rotary bearing 703 is provided inside the bearing housing 8. The rotary bearing 703 can be an angular contact bearing. The rotary bearing 703 is located in the bearing cavity of the bearing housing 8 and is fixedly connected to the bearing housing 8. A nut 7 is provided below the rotary bearing 703. The nut 7 has an internal thread 702. A lower baffle 701 is fixedly installed on the outer wall of the nut 7. During installation, the upper end face of the lower baffle 701 corresponds to the inner top surface 801 of the bearing housing 8. At the lower end of the cutter shaft 5, a pressure plate 505, a bushing 504 that matches the rotary bearing 703, and an outer... are arranged in sequence. The upper baffle 6 is also provided between the cutter shaft 5 and the bearing seat 8. When the lower end of the cutter shaft 5 is installed with the bearing seat 8, the lower end of the cutter shaft 5 passes through the upper baffle 6, the bearing seat 8, the rotary bearing 703 and the nut 7 in sequence. The lower end of the cutter shaft 5 is fixedly connected to the rotary bearing 703 through the bushing 504, and then fixedly connected to the internal thread 702 of the nut 7 through the external thread 502. The pressure plate 505 at the lower end of the cutter shaft 5 corresponds to the upper baffle 6. The upper baffle 6 is fixedly connected to the bearing seat 8 with screws. Multiple slag outlets 802 are provided on the side wall of the bearing seat 8.

[0016] The lower end of the cutter shaft 5 is fixedly connected to the bearing housing 8 via a bushing 504 and a rotary bearing 703. The cutter shaft 5 can rotate freely relative to the bearing housing 8 through the rotary bearing 703. During installation, the pressure plate 505 at the lower end of the cutter shaft 5 corresponds to the upper baffle 6, the upper surface of the lower baffle 701 corresponds to the inner top surface 801 of the bearing housing 8, and the upper surface of the nut 7 corresponds to the lower surface of the rotary bearing 703. These surfaces are not directly touching each other; a certain amount of rotational clearance, approximately 1mm, must be reserved. The upper baffle 6 and the nut 7 are used to prevent the rotary bearing 703 from dislodging during operation, providing a safety protection function.

[0017] The pull pin 1, the handle 2, the cutter shaft 5, and the nut 7 (and the lower baffle 701) are fixedly connected as one unit. In use, the above-mentioned integrated connection structure can rotate freely relative to the bearing seat 8 through the rotary bearing 703. When rotating, the pressure plate 505 rotates relative to the upper baffle 6, the lower baffle 701 rotates relative to the inner top surface 801 of the bearing seat 8, and the upper end surface of the nut 7 rotates relative to the lower end surface of the rotary bearing 703.

[0018] The function of the bearing housing 8 is to provide a stable and solid support for the floating tool holder. In order to reduce friction and protect the bearing housing 8, a grinding block 9 can also be set on the lower end face of the bearing housing 8. The grinding block 9 is made of wear-resistant material, such as polymer rubber block, etc. The grinding block 9 is fixedly connected to the bearing housing 8.

[0019] In some embodiments, a connecting member 803 may also be provided on the side wall of the bearing housing 8, see [reference]. Figure 3As shown, the connecting member 803 is provided with a through hole 804, which communicates with the inside of the bearing housing 8. An external vent pipe 805 is connected to the connecting member 803 by a threaded structure, and the external vent pipe 805 is connected to the through hole 804.

[0020] The usage method is briefly described below: Install the milling cutter at the bottom of the cutter shaft 5, and install the floating cutter holder on the woodworking machining center through the pull pin 1. Place the board to be processed on the worktable, and adjust the height of the floating cutter holder so that the bearing seat 8 at the lower end of the cutter holder 2 presses on the board surface. At this time, the elastic element 203 (compression spring) should be in a semi-compressed state. The length of the milling cutter exposed on the bottom surface of the bearing seat 8 is the milling groove depth of the board to be processed (different milling groove depths can be adjusted by adjusting the exposed length of the milling cutter, which is common mechanical knowledge and will not be elaborated further).

[0021] The equipment is started to perform milling. The milling cutter moves back and forth and left and right to mill the groove, controlled by the machining center program (pulling pin 1 drives the tool holder 2 and the tool shaft 5). During the machining process, the bearing seat 8 is always in contact with the plate surface and moves back and forth and left and right on the plate surface by the tool shaft 5. The rotation of the milling cutter relative to the bearing seat 8 is achieved by the rotary bearing 703. The bearing seat 8 always provides a stable and solid support force to the floating tool holder.

[0022] When encountering changes in the height of the sheet metal surface (changes in sheet metal surface height refer to changes in the curvature of the sheet metal surface; there will be no step-like changes in the height of the sheet metal surface; generally, the change in curvature slope is <1mm, and the upper and lower limit floating stroke of the floating cutter holder is 5mm, but the height error of the sheet metal surface during the production process is generally <1mm), under the action of the elastic element 203, the bearing seat 8 attached to the sheet metal surface will float up or down with the sheet metal surface, and the bearing seat 8 will in turn drive the milling cutter to float up and down. That is, the milling cutter goes up and down with the changes in the height of the sheet metal surface, but the exposed length of the milling cutter relative to the bottom surface of the bearing seat 8 remains unchanged. That is, the depth of the milled groove will always be consistent, and there will be no phenomenon of uneven depth. Moreover, the milling cutter will not wear excessively due to going too deep into the sheet metal surface, which well ensures the machining accuracy and extends the service life of the milling cutter.

[0023] During the processing, the milled wood chips are discharged through the slag outlet 802. In some embodiments, an external air pipe 805 can be provided on the side wall of the bearing seat 8, and an air blowing device (such as compressed air can be connected through a pressure regulating valve) can be connected to the external air pipe 805. This can better discharge the wood chips and improve the processing accuracy.

Claims

1. A floating tool holder for woodworking machinery, comprising a tool holder (2), a pull stud (1) connected to the upper end of the tool holder (2), and a tool shaft (5) connected to the lower end of the tool holder (2), characterized in that: The tool holder (2) has a hollow cavity (201) inside. The upper end of the tool shaft (5) has a slot (501). Corresponding to the slot (501), a pin hole (202) is provided on the side wall of the tool holder (2). The tool shaft (5) is inserted into the hollow cavity (201) and is movably connected to the tool holder (2) by inserting a pin (4) into the pin hole (202) and the slot (501). The diameter of the pin (4) is smaller than the diameter of the pin hole (202) and the slot (501), that is, the pin (4) has a displacement space to move up and down in the pin hole (202) and the slot (501), so that the tool shaft (5) has a displacement space to move up and down in the hollow cavity (201) of the tool holder. A spring element (203) is provided in the hollow cavity (201) of the tool holder. The upper end of the spring element (203) is connected to the top of the hollow cavity (201) of the tool holder, and the lower end of the spring element (203) is connected to the top of the tool shaft (5). A bearing seat (8) is provided at the lower end of the cutter shaft (5), and a rotary bearing (703) is provided inside the bearing seat (8). The rotary bearing (703) is located in the bearing cavity of the bearing seat (8) and is fixedly connected to the bearing seat (8). A bushing (504) matching the rotary bearing (703) is provided at the lower end of the cutter shaft (5). The lower end of the cutter shaft (5) is connected to the rotary bearing (703) through the bushing (504) to achieve the connection with the bearing seat (8). The cutter shaft (5) can rotate freely relative to the bearing seat (8) through the rotary bearing (703). A slag outlet (802) is provided on the side wall of the bearing seat (8).

2. The floating tool holder for woodworking machinery according to claim 1, characterized in that, A bushing (3) is provided at the lower end of the hollow cavity (201) of the tool holder. The bushing (3) is fixedly connected to the tool holder (2). A bushing cavity (301) is provided in the middle of the bushing (3). The tool shaft (5) passes through the bushing cavity (301) and is movably connected to the tool holder (2).

3. The floating tool holder for woodworking machinery according to claim 2, characterized in that, The bushing (3) is made of wear-resistant material.

4. The floating tool holder for woodworking machinery according to claim 1, characterized in that, A grinding block (9) is connected to the lower end of the bearing housing (8).

5. The floating tool holder for woodworking machinery according to claim 4, characterized in that, The grinding block (9) is made of wear-resistant material.

6. The floating tool holder for woodworking machinery according to claim 1, characterized in that, A connecting member (803) is provided on the side wall of the bearing housing (8), and a through hole (804) is provided on the connecting member (803). The through hole (804) communicates with the inside of the bearing housing (8), and an external vent pipe (805) is connected at the through hole (804) of the connecting member (803).

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