Locking device for sanding machine and sanding machine

Abstract

The present invention relates to a locking device for a sanding machine and a sanding machine provided with the locking device. The locking device for a sanding machine of the present invention comprises a detachably connected fixed connection mechanism and a locking mechanism, wherein the fixed connection mechanism comprises: a split connecting locking block, on which a first matching portion is provided; the locking mechanism comprises: a pressing locking block, on which a second matching portion is provided, the shapes and positions of the first matching portion and the second matching portion match; and a locking assembly for matching and tightly connecting the first matching portion and the second matching portion. The locking device can quickly loosen and lock the cantilever beam of the sanding machine and has excellent repeat positioning accuracy. On the other hand, the cantilever beam of the sanding machine provided by the present invention can have a span of up to 3200 mm, which is a wide-band sanding machine capable of significantly improving processing efficiency and processing accuracy.

Description

Technical Field

[0001] The invention relates to the field of sanding machine equipment manufacturing, in particular to a locking device for a sanding machine and a sanding machine provided with the locking device. Background Art

[0002] Wide-belt sanders are used for surface grinding of wide panels or strips, offering high efficiency, precision, and surface finish. Grinding is accomplished by rotating a wide, circular abrasive belt at high speed, grinding the entire width of the workpiece once the sander passes through it. Sanding quality can be customized by adjusting the belt grit, grit material, and number of sanding passes.

[0003] The sanding belt is the grinding tool of this machine and is also a consumable item. After grinding a certain amount of workpieces, the sand grains will wear out and a new sanding belt must be quickly replaced. At the same time, it is necessary to ensure that after the sanding belt is replaced, the cantilever beam in the sanding machine is accurately reset to ensure the processing accuracy of the equipment.

[0004] In existing technology centers, some locking and centering devices used in sanding machines utilize a cantilever beam arrangement, with a positioning block placed beneath the front end of the cantilever beam. To change the sanding belt, the positioning block must first be opened and removed. After the sanding belt is installed, the positioning block is inserted and then secured with bolts. This arrangement is suitable for sanding machines with small processing widths. As the width of sheet materials processed continues to increase, the width of the sheet materials to be sanded has increased from approximately 600mm to the current 3200mm, necessitating the cantilever beam to be extended to 3200mm. The cantilever beam is too long and heavy. When the detachable end of the cantilever beam is removed to replace the sanding belt, it sinks and presses against the positioning block, making it difficult to remove.

[0005] In some locking and centering devices, the centering structure adopts a circle-cone combination, which is difficult to manufacture and the repeat positioning accuracy is unreliable. Summary of the Invention

[0006] In view of the above problems existing in the prior art, the present invention provides a locking device which can quickly loosen and lock the cantilever beam of a sanding machine and has excellent repeat positioning accuracy.

[0007] The locking device for a sanding machine of the present invention comprises a detachably connected fixed connection mechanism and a locking mechanism, wherein the fixed connection mechanism comprises: a split connection locking block, on which a first matching portion is provided;

[0008] The locking mechanism includes: a pressing locking block, on which a second matching portion is provided, and the shapes and positions of the first matching portion and the second matching portion match; and a locking assembly for matching and firmly connecting the first matching portion and the second matching portion.

[0009] In the present invention, the locking mechanism can connect the separate connecting lock blocks into one with good reset accuracy through the cooperation of the first and second matching parts. The locking device is located between the left and right sides of the sander cantilever beam and the frame, connecting the cantilever beam and the frame.

[0010] The locking device of the present invention allows for rapid tightening and loosening of the cantilever beam in a wide-belt sander, enabling quick replacement of the sanding belt. Specifically, the locking device is opened, the old sanding belt is removed from the end of the cantilever beam where the locking device is mounted, and the new sanding belt is inserted into its proper position. The locking device is then operated to reset the cantilever beam and securely connect it to the machine frame. The split locking block allows the cantilever beam to be freely suspended when the block is opened, allowing the annular sanding belt to be pulled out or loaded from the side. The block can be easily removed, and the locking assembly can be quickly inserted and removed.

[0011] According to one aspect of the present invention, the cross-sectional shape of the first matching portion and the second matching portion is trapezoidal;

[0012] When the locking assembly is tightly connected to the connecting locking block and the pressing locking block, only the inclined side surfaces of the first matching portion and the second matching portion are in contact with each other.

[0013] Specifically, in the present invention, the inclined conical surface located on the connecting lock block and the pressing lock block, close to the locking assembly, is the secondary conical surface; the inclined conical surface located on the connecting lock block and the pressing lock block, close to the frame and the cantilever beam, is the main conical surface. In the concept of the present invention, the locking device fixes the connecting lock block and the pressing lock block through the locking assembly, and uses the precise matching of the main conical surface and the secondary conical surface to restore the cantilever beam to the designed and installed zero position. The main conical surface matching is used for repeated positioning, and the secondary conical matching surface is used for positioning and locking zero position. After the connecting lock block and the pressing lock block are pulled close and fixed by the locking assembly, only the main conical surface and the secondary conical surface are in contact and connected with each other. There is a gap between the top and bottom of the first matching part and the top and bottom of the second matching surface, and there is also a gap between the surfaces of the connecting lock block and the pressing lock block that are close to each other.

[0014] According to one aspect of the present invention, the first matching portion includes a left first matching portion and a right first matching portion that are symmetrically arranged, wherein the left first matching portion is arranged on the left connecting locking block, and the right first matching portion is arranged on the right connecting locking block;

[0015] The first mating portion and the second mating portion are connected in a plug-in manner.

[0016] Preferably, in the locking device of the present invention, the first mating portion is symmetrically arranged on the separate connecting locking blocks, with one mating portion provided on each connecting locking block; the second mating portion is provided on the pressing locking block, matching the first mating portion. The left connecting locking block mates with the tapered surface of the pressing locking block, and the right connecting locking block mates with the tapered surface of the pressing locking block, ensuring accurate repeated positioning and resetting while avoiding over-positioning.

[0017] According to one aspect of the present invention, the first matching portion and the second matching portion are linear in a vertical length direction.

[0018] In the present invention, the first and second mating portions are elongated, effectively increasing the mating area during locking and ensuring precise repeatable positioning and resetting. The linear first and second mating portions form a slide rail and a slider, allowing for easy sliding disconnection when removing the compression lock block from the connecting lock block, ensuring rapid release and locking of the locking mechanism.

[0019] According to one aspect of the present invention, the first matching portion is a boss structure, and the second matching portion is a groove structure.

[0020] According to one aspect of the present invention, the first matching portion is a groove structure, and the second matching portion is a boss structure.

[0021] In the present invention, it is sufficient as long as the first matching portion and the second matching portion can be matched and plugged with each other, and the boss structure and the groove structure can be arranged according to specific needs.

[0022] According to one aspect of the present invention, the first matching portion and the second matching portion are closed structures in the length direction.

[0023] Preferably, in the concept of the present invention, the first and second mating portions are in the shape of long strips, which effectively increases the mating area during locking and ensures the accuracy of repeated positioning and resetting. Preferably, the vertical long strip-shaped first and second mating portions are configured as a structure with closed ends, and the end surfaces of both ends are flat. When the first and second mating portions are plugged into each other, the end surfaces at both ends can play a role in rough positioning, helping the operator to quickly and easily find the approximate position where the connecting lock block and the pressing lock block are mated with each other; when the first and second mating portions are disassembled, the end surfaces at both ends can play a role in limiting displacement, preventing the pressing lock block from sliding off the connecting lock block.

[0024] According to one aspect of the present invention, the locking assembly includes: a locking screw block, which is screwed onto the locking screw; and a push pin, which is inserted through the axis of the locking screw, with both ends protruding from the surface of the locking screw, and the length of the push pin is less than the distance between the left connecting locking block and the right connecting locking block at the push pin installation location;

[0025] A left slide is provided on the side surface in the thickness direction of the left connecting locking block, and a right slide is symmetrically provided on the side surface in the thickness direction of the right connecting locking block. The locking screw block can be slidably clamped between the left slide and the right slide, and the left slide and the right slide are non-through slides.

[0026] In the present invention, a push pin is provided that extends through the locking screw and is positioned between the left and right connecting locking blocks. Because the push pin's length is less than the spacing between the left and right connecting locking blocks, when the locking screw moves away from the end face of the cantilever beam on which the locking device is mounted, the push pin can rotate and move with the locking screw without becoming stuck between the left and right connecting locking blocks. Furthermore, because the push pin's length is greater than the diameter of the locking screw, when the push pin moves outward, it can move the compression locking block outward together, thereby disengaging the second mating portion of the compression locking block from the first mating portion.

[0027] Specifically, in the present invention, the locking assembly includes a locking screw block and a locking screw that are screwed together. The locking screw block has an outer shape of a cylinder with two parallel slider planes, the left slide and the right slide are symmetrically arranged, and the surface for the locking screw block to slide upward is the slide plane, and the slider plane and the slide plane cooperate with each other to enable the locking screw block to slide between the left slide and the right slide, but cannot rotate between the left slide and the right slide. Such an arrangement enables the locking screw to produce a displacement perpendicular to the locking screw block when the locking screw rotates, thereby playing a role in adjusting the distance between the first matching part and the second matching part. When the second matching part is completely separated from the first matching part, the locking assembly can leave the locking device from above with the compression lock block, thereby changing the cantilever beam and the frame from a connected state to a separated state, so as to facilitate the loading and unloading of the sanding belt. Preferably, the lower parts of the left slide and the right slide are set to arc surfaces that match the arc parts of the outer shape of the locking screw. The arc surfaces can limit the displacement of the locking screw in the upper and lower directions. When the locking assembly and the compression locking block are placed between the connecting locking blocks, the arc part of the locking screw contacts the arc surface to roughly position the locking screw and prevent the locking screw from falling.

[0028] According to one aspect of the present invention, the left connecting locking block for fixed connection with the cantilever beam is positioned by a positioning pin and fixedly installed by a screw;

[0029] The right connecting locking block for fixedly connecting to the frame is positioned by a positioning key and a positioning plane perpendicular to the positioning key, and is fixedly installed by screws.

[0030] The left connecting locking block is fixedly connected to the cantilever beam, and the right connecting locking block is fixedly connected to the frame. The accuracy of the two connection positions affects the mating installation of the first and second mating portions. Therefore, the left and right connecting locking blocks must be measured and positioned. After the precise installation position is determined using positioning components, they are fixed to the cantilever beam and frame using screws. In the present invention, the positioning components specifically include positioning pins, positioning keys, and positioning planes.

[0031] According to one aspect of the present invention, a through hole is provided on the compression lock block, and one end of the locking screw is movably provided in the through hole;

[0032] The locking assembly also includes: a handle assembly, wherein the locking screw is fixedly installed on one end of the handle assembly close to the compression lock block, wherein a hexagonal column is provided at the end of the handle assembly away from the compression lock block, and the distance between the end face of the other end of the handle assembly and the push rod is greater than the thickness of the compression lock block.

[0033] In the present invention, a locking screw is inserted through a through-hole in the compression lock block, and a handle assembly is disposed at the outer end of the locking screw. The handle assembly and the locking screw are welded or threaded together and then fixedly connected by a pin, with no particular limitation on the specific method of fixing. Rotating the handle assembly rotates the locking screw accordingly. Preferably, after rotating the handle assembly to tighten the compression lock block and the connecting lock block, the hexagonal column disposed at the end of the locking screw is further tightened by operating a wrench.

[0034] On the other hand, the present invention further provides a sanding machine including the locking device, comprising: a cantilever beam, one end of the cantilever beam being fixedly connected to a frame of the sanding machine, and the other end being detachably connected to the frame via the locking device;

[0035] A bracket is fixedly mounted on the frame, the positioning key is fixedly mounted on the side of the frame close to the right connecting lock block, a positioning key slot is arranged on the side of the corresponding position of the right connecting lock block, and the positioning plane is arranged on the bracket for contacting and positioning with the right side surface of the right connecting lock block; and

[0036] A positioning block is fixedly mounted on the end surface of the other end of the cantilever beam, and the right side of the positioning block contacts and positions the left side of the left connecting locking block.

[0037] In the sanding machine provided by the present invention, the left connecting locking block is fixedly connected after being precisely positioned with the cantilever beam through the positioning block and the positioning pin, and the right connecting locking block is fixedly connected after being precisely positioned with the bracket arranged on the frame through the positioning key and the positioning plane.

[0038] The present invention has the following beneficial effects: On the one hand, it provides a locking device that can quickly loosen and lock the cantilever beam of a sanding machine and has excellent repeatability. When the locking device of the present invention is used to lock the cantilever beam and the machine frame, the repeatability can reach within 0.02 mm, thereby effectively ensuring the processing accuracy of the wide-band sanding machine. On the other hand, the present invention also provides a sanding machine including the locking device, wherein the cantilever beam for mounting the sanding belt can have a span of up to 3200 mm, significantly improving processing efficiency and precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a cross-sectional view taken along line AA of a schematic structural diagram of a locking device according to an embodiment of the present invention;

[0040] Figure 2 is a front view of a schematic structural diagram of a locking device according to an embodiment of the present invention;

[0041] Figure 3 It is a top view of a structural schematic diagram of a locking device according to an embodiment of the present invention.

[0042] Figure numbers: 1-fixed connection mechanism; 11-left connecting lock block; 11a-left slide; 12-right connecting lock block; 12a-right slide; 13-first matching portion; 2-locking mechanism; 21-pressing lock block; 22-second matching portion; 23-locking assembly; 231-locking screw block; 232-locking screw; 233-pushing rod; 234-handle assembly; 3-locating pin; 4-locating block, 5-locating key; 6-bracket; 7-cantilever beam; 8-frame; DETAILED DESCRIPTION

[0043] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0045] like Figure 1 The figure shows an embodiment of the locking device for a sanding machine of the present invention, comprising a detachably connected fixed connection mechanism 1 and a locking mechanism 2, wherein the fixed connection mechanism 1 comprises: a split connection locking block, on which a first mating portion 13 is provided;

[0046] The locking mechanism 2 includes: a pressing lock block 21, a second matching portion 22 is provided on the pressing lock block 21, and the shapes and positions of the first matching portion 13 and the second matching portion 22 match; and

[0047] The locking assembly 23 is used to securely connect the first matching portion 13 and the second matching portion 22 .

[0048] In this embodiment, the locking mechanism 2 can connect the separate connecting locking blocks into one piece with good resetting accuracy through the cooperation of the first matching portion 13 and the second matching portion 22. The locking device is located between the left and right sides of the sander cantilever beam 7 and the frame 8, connecting the cantilever beam 7 and the frame 8.

[0049] The locking device of this embodiment is suitable for quickly tightening and loosening the cantilever beam 7 in a wide-belt sander, allowing for rapid replacement of the sanding belt. Specifically, the locking device is opened, the old sanding belt is removed from the end of the cantilever beam 7 where the locking device is mounted, and the new sanding belt is inserted into its place. The locking device is then operated to reset the cantilever beam 7 and securely connect it to the frame 8. The connecting locking block is split. When the connecting locking block is opened, the cantilever beam 7 is freely suspended, allowing the endless sanding belt to be pulled out or loaded from the side. The connecting locking block can be easily removed, and the locking assembly 23 can also be quickly removed and loaded.

[0050] like Figure 1 As shown, according to this embodiment, the cross-sectional shape of the first matching portion 13 and the second matching portion 22 is a trapezoid;

[0051] When the locking assembly 23 is fastened to the connecting locking block and the pressing locking block 21 , only the inclined side surfaces of the first matching portion 13 and the second matching portion 22 are in contact with each other.

[0052] Specifically, in this embodiment, the inclined conical surface located on the connecting lock block and the pressing lock block 21, close to the locking assembly 23, is the secondary conical surface; the inclined conical surface located on the connecting lock block and the pressing lock block 21, close to the frame 8 and the cantilever beam 7, is the primary conical surface. In this embodiment, the locking device fixes the connecting lock block and the pressing lock block 21 through the locking assembly 23, and uses the precise matching of the primary conical surface and the secondary conical surface to restore the cantilever beam 7 to the designed and installed zero position. The primary conical surface matching is used for repeated positioning, and the secondary conical matching surface is used for positioning and locking the zero position. When the connecting lock block and the pressing lock block 21 are pulled together and fixed by the locking assembly 23, only the primary conical surface and the secondary conical surface are in contact and connected with each other. There is a gap between the top and bottom of the first matching portion 13 and the top and bottom of the second matching surface, and there is also a gap between the surfaces of the connecting lock block and the pressing lock block 21 that are close to each other.

[0053] It should be understood that if Figure 1As shown, the locking block 21 is divided into two parts, namely an inner frustum (secondary cone) and an annular outer frustum (primary cone). The inclined outer side surface of the inner frustum is the secondary cone surface, and the inclined inner side surface of the annular outer frustum is the primary cone surface.

[0054] Furthermore, when the frustum area of ​​the first matching portion 13 or the second matching portion 22 is infinitely close to 0, its cross section is close to a triangle. Therefore, while ensuring accuracy, the cross section of the first matching portion 13 or the second matching portion 22 is a trapezoid or a triangle.

[0055] The cross-sectional shape of the first matching portion 13 or the second matching portion 22 is a trapezoid, and the optimal bottom angle of the trapezoid is 60°.

[0056] According to this embodiment, the first matching portion 13 includes a left first matching portion 13 and a right first matching portion 13 that are symmetrically arranged, wherein the left first matching portion 13 is arranged on the left connecting locking block 11, and the right first matching portion 13 is arranged on the right connecting locking block 12;

[0057] The second matching portion 22 is symmetrically arranged on the pressing lock block 21;

[0058] The first matching portion 13 and the second matching portion 22 are plug-fitted and connected.

[0059] In this embodiment of the locking device, the first mating portion 13 is symmetrically arranged on the separate connecting locking blocks, with one portion provided on each connecting locking block. The second mating portion 22, matching the first mating portion 13, is also provided on the pressing locking block 21. The second mating portions 22 are also separate and symmetrically distributed. The left connecting locking block 11 and the pressing locking block 21 only have one mating connection, and the right connecting locking block 12 and the pressing locking block 21 only have one mating connection. This ensures accurate repeated positioning and resetting while preventing over-positioning.

[0060] In this embodiment, the first matching portion 13 and the second matching portion 22 are linear in the vertical length direction.

[0061] In this embodiment, the first and second mating portions 13, 22 are elongated, effectively increasing the mating area during locking and ensuring accurate repeatable positioning and resetting. The linear first and second mating portions 13, 22 form a slide rail and a slider, allowing for easy sliding disconnection when removing the compression lock block 21 from the connecting lock block, ensuring rapid release and locking of the locking mechanism.

[0062] In this embodiment, the first matching portion 13 is a boss structure, and the second matching portion 22 is a groove structure.

[0063] like Figure 2 、 Figure 3As shown, in this embodiment, the first matching portion 13 and the second matching portion 22 are closed structures in the length direction.

[0064] In this embodiment, the first mating portion 13 and the second mating portion 22 are elongated, effectively increasing the mating area during locking and ensuring accurate repeated positioning and resetting. Preferably, the vertical elongated first mating portion 13 and the second mating portion 22 are configured as a structure with closed ends, and the end surfaces at both ends are flat. When the first mating portion 13 and the second mating portion 22 are plugged into each other, the end surfaces at both ends can serve as a rough positioning function, helping the operator to quickly and easily find the approximate position where the connecting lock block and the pressing lock block 21 are mated and plugged into each other; when the first mating portion 13 and the second mating portion 22 are disassembled, the end surfaces at both ends can serve as a displacement limiter, preventing the pressing lock block 21 from sliding off the connecting lock block.

[0065] In this embodiment, the locking assembly 23 includes: a locking screw block 231, which is screwed onto the locking screw 232; and a push pin 233, which is inserted through the axis of the locking screw 232, with both ends protruding from the surface of the locking screw 232. The length of the push pin 233 is less than the distance between the left connecting locking block 11 and the right connecting locking block 12 at the location where the push pin 233 is installed.

[0066] A left slide 11a is provided on the side surface in the thickness direction of the left connecting locking block 11, and a right slide 12a is symmetrically provided on the side surface in the thickness direction of the right connecting locking block 12. The locking screw 231 can be slidably clamped between the left slide 11a and the right slide 12a. The left slide 11a and the right slide 12a are non-through slides.

[0067] In this embodiment, a push pin 233 is provided that extends through the locking screw 232 and is located between the left connecting lock block 11 and the right connecting lock block 12. Because the length of the push pin 233 is less than the distance between the left connecting lock block 11 and the right connecting lock block 12, when the locking screw 232 moves away from the end surface of the cantilever beam 7 on which the locking device is mounted, the push pin 233 can rotate and move with the locking screw 232 and will not be stuck between the left connecting lock block 11 and the right connecting lock block 12. At the same time, because the length of the push pin 233 is greater than the diameter of the locking screw 232, when the push pin 233 moves outward, it can move outward with the pressing lock block 21, thereby disengaging the second mating portion 22 of the pressing lock block 21 from the first mating portion 13.

[0068] The left slide 11 a and the right slide 12 a are non-through slides and form a U-shaped structure. The horizontal portion of the U-shaped structure can be used for the initial positioning of the locking assembly 23 .

[0069] like Figure 3As shown, in this embodiment, the locking assembly 23 includes a locking screw 231 and a locking screw 232 that are screwed together. The locking screw 231 has an outer shape of a cylinder with two parallel slider planes. The left slide 11a and the right slide 12a are symmetrically arranged, and the surface for the locking screw 231 to slide upward is the slide plane. The slider plane and the slide plane cooperate with each other to enable the locking screw 231 to slide between the left slide 11a and the right slide 12a, but not to rotate between the left and right slides 12a. This arrangement allows the locking screw 232 to produce a displacement perpendicular to the locking screw 231 when the locking screw 232 rotates, thereby adjusting the distance between the first matching portion 13 and the second matching portion 22. When the second mating portion 22 is completely separated from the first mating portion 13, the locking assembly 23 and the compression lock block 21 can be separated from the locking device from above, thereby changing the cantilever beam 7 and the frame 8 from a connected state to a separated state, so as to facilitate the loading and unloading of the abrasive belt. Preferably, the lower portions of the left slide 11a and the right slide 12a are configured as arc surfaces that match the arc portions of the outer shape of the locking screw 231. The arc surfaces can limit the displacement of the locking screw 231 in the vertical direction. When the locking assembly 23 and the compression lock block 21 are placed between the connecting lock blocks, the arc portion of the locking screw 231 contacts the arc surface to roughly position the locking screw 231 and prevent the locking screw 231 from falling.

[0070] In this embodiment, the left connecting locking block 11 for fixed connection with the cantilever beam 7 is positioned by the positioning pin 3 and fixedly installed by screws;

[0071] The right connecting locking block 12 for fixed connection with the frame 8 is positioned by the positioning key 5 and a positioning plane perpendicular to the positioning key 5 and is fixedly installed by screws.

[0072] The left connecting locking block 11 is fixedly connected to the cantilever beam 7, and the right connecting locking block 12 is fixedly connected to the frame 8. The accuracy of these two connection positions affects the mating installation of the first mating portion 13 and the second mating portion 22. Therefore, the left and right connecting locking blocks 11 and 12 must be measured and positioned. After the precise installation position is determined using positioning components, they are then fixed to the cantilever beam 7 and the frame 8 using screws. In this embodiment, the positioning components specifically include the positioning pin 3, the positioning key 5, and the positioning plane.

[0073] In this embodiment, a through hole is provided on the compression lock block 21, and one end of the locking screw 232 is movably provided in the through hole;

[0074] The locking assembly 23 also includes: a handle assembly 234, and the locking screw 232 is fixedly installed on one end of the handle assembly 234 close to the clamping lock block 21, wherein a hexagonal column is set at the end of the handle assembly 234 away from the clamping lock block 21, and the distance between the end face of the other end of the handle assembly 234 and the push rod is greater than the thickness of the clamping lock block 21.

[0075] In this embodiment, a locking screw 232 is inserted through a through-hole in the compression lock block 21, and a handle assembly 234 is disposed at the outer end of the locking screw 232. The handle assembly 234 and the locking screw 232 are welded or threaded together and then fixedly connected by a pin. The specific fixing method is not limited. Rotating the handle assembly 234 rotates the locking screw 232 accordingly. Preferably, after rotating the handle assembly 234 to tighten the compression lock block 21 and the connecting lock block, the hexagonal column disposed at the end of the locking screw 232 is further tightened by operating a wrench.

[0076] On the other hand, an embodiment of a sanding machine according to the present invention includes: a cantilever beam 7, one end of the cantilever beam 7 is fixedly connected to a frame 8 of the sanding machine, and the other end is detachably connected to the frame 8 via a locking device;

[0077] The bracket 6 is fixedly mounted on the frame 8, a positioning key 5 is fixedly mounted on the side of the frame 8 near the right connecting lock block 12, a positioning key slot is set on the side of the corresponding position of the right connecting lock block 12, and a positioning plane is set on the bracket 6 for contacting and positioning with the right side surface of the right connecting lock block 12; and

[0078] The positioning block 4 is fixedly mounted on the end surface of the other end of the cantilever beam 7 , and the right side surface of the positioning block 4 contacts the left side surface of the left connecting locking block 11 for positioning.

[0079] In the sanding machine provided in this embodiment, the left connecting locking block 11 is fixedly connected after being precisely positioned by the positioning block 4, the positioning pin 3 and the cantilever beam 7, and the right connecting locking block 12 is fixedly connected after being precisely positioned by the positioning key 5, the positioning plane and the bracket 6 set on the frame 8.

[0080] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail, it should be understood that they can be implemented by adopting general devices and methods available in the art.

[0081] The above is only one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A locking device for a sanding machine, suitable for a wide belt sanding machine, comprising a detachably connected fixing connection mechanism (1) and a locking mechanism (2), characterized in that: The fixed connection mechanism (1) comprises: a separate connection locking block, on which a first matching portion (13) is provided; The locking mechanism (2) comprises: a pressing locking block (21), a second matching portion (22) being provided on the pressing locking block (21), the first matching portion (13) and the second matching portion (22) matching in shape and position; and A locking assembly (23) for fitting and securely connecting the first matching portion (13) and the second matching portion (22); The first matching portion (13) comprises a left first matching portion (13) and a right first matching portion (13) that are symmetrically arranged, wherein the left first matching portion (13) is arranged on the left connecting locking block (11), and the right first matching portion (13) is arranged on the right connecting locking block (12); The first matching portion (13) and the second matching portion (22) are connected in a plug-in manner; The locking assembly (23) comprises: a locking screw block (231) screwed onto one end of a locking screw rod (232); a through hole is provided on the pressing locking block (21); and the other end of the locking screw rod (232) is movably provided in the through hole; The cross-sectional shapes of the first matching portion (13) and the second matching portion (22) are trapezoidal; When the locking assembly (23) is tightly connected to the connecting locking block and the pressing locking block (21), only the inclined side surfaces of the first matching portion (13) and the second matching portion (22) are in contact with each other.

2. The locking device for a sanding machine according to claim 1, characterized in that: The first matching portion (13) and the second matching portion (22) are linear in a vertical length direction.

3. The locking device for a sanding machine according to claim 2, characterized in that: The first matching portion (13) is a boss structure, and the second matching portion (22) is a groove structure.

4. The locking device for a sanding machine according to claim 2, characterized in that: The first matching portion (13) is a groove structure, and the second matching portion (22) is a boss structure.

5. The locking device for a sanding machine according to claim 3 or 4, characterized in that: The first matching portion (13) and the second matching portion (22) are closed structures in the length direction.

6. The locking device for a sanding machine according to claim 5, characterized in that: The locking assembly (23) further comprises: A push pin (233) is inserted through the axis of the locking screw (232), with both ends protruding from the surface of the locking screw (232), and the length of the push pin (233) is less than the distance between the left connecting locking block (11) and the right connecting locking block (12) at the installation location of the push pin (233); A left slideway (11a) is provided on the side surface in the thickness direction of the left connecting lock block (11), and a right slideway (12a) is symmetrically provided on the side surface in the thickness direction of the right connecting lock block (12). The locking screw block (231) is slidably mounted between the left slideway (11a) and the right slideway (12a). The left slideway (11a) and the right slideway (12a) are non-through slideways.

7. The locking device for a sanding machine according to claim 6, characterized in that: The left connecting lock block (11) for fixed connection with the cantilever beam (7) is positioned by a positioning pin (3) and fixedly installed by screws; The right connecting lock block (12) for fixed connection with the frame (8) is positioned by a positioning key (5) and a positioning plane perpendicular to the positioning key (5), and is fixedly installed by screws.

8. The locking device for a sanding machine according to claim 7, characterized in that: The locking assembly (23) further comprises: a handle assembly (234), wherein the locking screw (232) is fixedly mounted on one end of the handle assembly (234) close to the pressing lock block (21), wherein a hexagonal column is provided on one end of the handle assembly (234) away from the pressing lock block (21), and the distance between the end face of the other end of the handle assembly (234) and the push rod is greater than the thickness of the pressing lock block (21).

9. A sanding machine comprising the locking device according to claim 8, characterized in that: It comprises a cantilever beam (7), one end of which is fixedly connected to a frame (8) of a sanding machine, and the other end of which is detachably connected to the frame (8) via the locking device; A bracket (6) is fixedly mounted on the frame (8), the positioning key (5) is fixedly mounted on the side of the frame (8) close to the right connecting lock block (12), a positioning key slot is arranged on the side of the corresponding position of the right connecting lock block (12), and the positioning plane is arranged on the bracket (6) for contacting and positioning with the right side surface of the right connecting lock block (12); and A positioning block (4) is fixedly mounted on the end surface of the other end of the cantilever beam (7), and the right side of the positioning block (4) contacts and positions the left side of the left connecting locking block (11).

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