A knife dropping device

Abstract

The present invention discloses a knife-dropping device, which relates to the field of experimental testing equipment. The knife-dropping device includes a base and a bracket vertically fixed on the base. The knife-dropping device also includes a tool assembly and a deadweight assembly. One end of the tool assembly is hinged to the bracket. The deadweight assembly includes a weight and an elastic driving member. One end of the elastic driving member is connected to the base, and the other end is connected to the tool assembly. The elastic driving member can drive the tool assembly to rotate relative to the bracket in a direction away from the base; the weight is detachably connected to the elastic driving member, and can drive the tool assembly to rotate around the bracket in a direction close to the base. When in contact with the CRB specimen, the load of the weight can be effectively transferred to the tool assembly, thereby cutting the CRB specimen. Compared with the lathe processing method, the method of using an elastic driving member in combination with a weight avoids the scratching of the specimen cut surface caused by the vibration of the lathe, and its cutting is more stable and the cut surface is smoother.

Description

Technical Field

[0001] The invention relates to the field of experimental testing equipment, in particular to a knife dropping device. Background Art

[0002] Crack growth tests under cyclic loading often use CRB (Cracked Round Bar) specimens with smaller cracks. By observing the crack growth on the surface of the CRB specimen under cyclic loading, the slow crack growth resistance of the material is tested. Therefore, a crack needs to be machined in the center of the CRB specimen in the circumferential direction for specimen fatigue testing.

[0003] In existing technology, the depth of machined cracks is determined by indirectly measuring the crack opening displacement using an extensometer. Therefore, the crack opening width must be minimized and the cut must be smooth to ensure accurate extensometer measurement. External grooving blades are commonly used in lathe machining to ensure a smooth cut surface. However, the machining depth of external grooving blades is generally 75% of the blade depth, making it difficult to meet the requirement for a minimal crack opening width. Furthermore, using thin blades to reduce the crack opening width can lead to excessive bending, vibration, and even breakage. Therefore, existing lathe tooling systems struggle to simultaneously meet the requirements for a minimal crack opening width and a smooth cut.

[0004] Based on this, it is urgent to invent a knife dropping device to solve the problems raised above. Summary of the Invention

[0005] One object of the present invention is to provide a cutting device that can meet the requirements of small crack opening width and smooth incision, thereby improving processing accuracy.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A knife dropping device, comprising:

[0008] base;

[0009] a bracket, the bracket being vertically fixed on the base;

[0010] a cutter assembly, one end of which is hinged to the bracket;

[0011] A deadweight assembly, comprising a weight and an elastic driving member, wherein one end of the elastic driving member is connected to the base and the other end is connected to the tool assembly, and the elastic driving member can drive the tool assembly to rotate relative to the bracket in a direction away from the base;

[0012] The weight is detachably connected to the elastic driving member and can drive the tool assembly to rotate around the bracket toward the base.

[0013] Optionally, the tool assembly comprises:

[0014] Cutlery;

[0015] The tool holder is provided with a tool groove capable of clamping the tool, one end of the tool holder is hinged to the bracket, and the other end of the tool holder is fixedly connected to the elastic driving member.

[0016] Optionally, the tool holder includes a tool holder body and a clamp, the clamp is detachably connected to the tool holder body, and a tool groove for clamping the tool is formed between the clamp and the tool holder body.

[0017] Optionally, an anti-slip member is provided in the knife groove.

[0018] Optionally, a bubble level is provided on both the base and the tool assembly to check whether the tool assembly and the base are level.

[0019] Optionally, the knife dropping device further comprises a moving component mounted on the base, the moving component being capable of sliding horizontally relative to the base, and the bracket and the self-weight component being both fixedly connected to the moving component.

[0020] Optionally, a scale is provided on the surface of the base, and a zero line corresponding to the zero scale of the scale is provided on the movable component, and the scale is used to calibrate the sliding distance of the movable component along the base.

[0021] Optionally, a fixing component is provided on the base, and the fixing component is used to fix the position of the moving component.

[0022] Optionally, the elastic driving member is a hydraulic cylinder or a pneumatic cylinder.

[0023] Optionally, the deadweight assembly further includes a tray, the tray is fixedly connected to the piston rod of the air cylinder or the hydraulic cylinder, and the tray is used to place the heavy object.

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a cutting device comprising a base and a bracket vertically fixed to the base. The cutting device also includes a tool assembly and a deadweight assembly. One end of the tool assembly is hingedly connected to the bracket. The deadweight assembly includes a weight and an elastic drive element. The elastic drive element is connected to the base at one end and to the tool assembly at the other end. The elastic drive element can drive the tool assembly to rotate relative to the bracket away from the base. The weight is detachably connected to the elastic drive element and can drive the tool assembly to rotate around the bracket toward the base. When contacting a CRB specimen, the load of the weight is effectively transferred to the tool assembly, thereby cutting the CRB specimen. Compared to lathe machining, the use of an elastic drive element and a weight in combination avoids scratches on the specimen cut surface caused by lathe vibration, resulting in more stable cutting and a smoother cut surface. Furthermore, the blade in the tool assembly can be narrow and sufficiently sharp to ensure that the crack opening is controlled within the narrow range of the blade width, thereby simultaneously meeting the requirements of a small crack opening width and a smooth cut. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 2. It is a structural schematic diagram of a knife dropping device in an embodiment of the present invention;

[0027] Figure 2 is an exploded view of a deadweight assembly according to an embodiment of the present invention;

[0028] Figure 3 is an exploded view of a tool assembly according to an embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the knife dropping device in which the knife assembly is omitted in an embodiment of the present invention.

[0030] In the picture:

[0031] 1. Self-weight assembly; 2. Base; 3. Bracket; 4. Tool assembly; 5. Bubble level; 6. Moving parts;

[0032] 11. Heavy object; 12. Hydraulic cylinder; 13. Pallet; 21. Ruler; 22. Fixing part; 23. Slide; 31. Pin; 32. Cylindrical hole; 41. Cutting tool; 42. Tool holder; 43. Cutting tool groove; 44. Fastening part; 45. Anti-slip part;

[0033] 121. Piston rod; 122. Cylinder barrel; 123. Cylinder head; 421. Tool holder body; 422. Clamp. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0035] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0038] The embodiment of the present invention provides a knife dropping device, such as Figure 1 As shown, the knife-dropping device includes a base 2 and a bracket 3. The bracket 3 is vertically fixed to the base 2. The knife-dropping device also includes a cutter assembly 4. One end of the cutter assembly 4 is hinged to the bracket 3, allowing the cutter assembly 4 to rotate relative to the bracket 3 toward the base 2. The cutter assembly 4 cuts the surface of the CRB specimen at the central reversal point, cutting a crack on the CRB surface to conduct a crack growth test under cyclic loading to test the slow crack growth resistance of the CRB specimen material.

[0039] However, in existing techniques, the crack depth is determined by indirectly measuring the crack opening displacement using an extensometer. Therefore, the crack opening width must be minimized and the cut must be smooth to ensure accurate extensometer measurement. External grooving blades are commonly used in lathe machining to ensure a smooth cut surface. However, the machining depth of external grooving blades is generally 75% of the blade depth, making it difficult to meet the requirement for a minimal crack opening width. Furthermore, using thin blades to reduce the crack opening width can lead to excessive bending, vibration, and even breakage. Therefore, existing lathe tooling systems struggle to simultaneously meet the requirements for a minimal crack opening width and a smooth cut.

[0040] To solve the above problems, Figure 1-3 As shown, the knife-dropping device proposed in an embodiment of the present invention also includes a self-weight assembly 1, which includes a weight 11 and an elastic drive member. The elastic drive member is connected to the base 2 at one end and to the cutter assembly 4 at the other end. The elastic drive member can drive the cutter assembly 4 to rotate relative to the support 3 away from the base 2. The weight 11 is detachably connected to the elastic drive member and can drive the cutter assembly 4 to rotate around the support 3 toward the base 2. Before the weight 11 is inserted, the elastic drive member exerts an upward force on the cutter assembly 4, causing it to rotate relative to the support 3 away from the base 2, thereby ensuring that the cutter assembly 4 remains horizontal or at a certain elevation angle, preventing contact between the cutter assembly 4 and the CRB specimen. When the knife-dropping device is used to cut a CRB specimen, the weight 11 is connected to the elastic drive member. The load of the weight 11 overcomes the action of the elastic drive member and drives the cutter assembly 4 downward. The weight 11 then drives the cutter assembly 4 to rotate around the support 3 toward the base 2, thereby stabilizing the central circumferential position of the CRB specimen. Compared to lathe processing, the use of a flexible drive member in conjunction with a weight 11 prevents lathe vibrations from scratching the cut surface of the specimen, resulting in a more stable cut and a smoother cut surface. Furthermore, the blade within the tool assembly 4 can be a narrow, sufficiently sharp blade to ensure that the crack opening is controlled within a narrow range of the blade width, thereby simultaneously meeting the requirements of a small crack opening width and a smooth cut.

[0041] Alternatively, the elastic drive member can be configured as a pneumatic cylinder, connecting the cutter assembly 4 to the cylinder's output end. The cylinder's output end can be configured as a piston rod 121. Driven by the pneumatic cylinder, the piston rod 121 drives the cutter assembly 4 to rotate about the support 3, thereby ensuring stable cutting of the CRB specimen. Pneumatic cylinders are suitable for applications involving reciprocating linear motion, and one-way throttle valves on either side of the cylinder can easily achieve stable speed control. Alternatively, the elastic drive member can be configured as a hydraulic cylinder 12, removably connecting the weight 11 to the hydraulic cylinder 12. The hydraulic cylinder 12's output end can also be configured as a piston rod 121, removably connecting the weight 11 to the piston rod 121. The load of the weight 11 is effectively and stably transferred to the cutter assembly 4, thereby driving the cutter assembly 4 to rotate about the support 3. This embodiment utilizes the hydraulic rod 12 and weight 11 to drive the cutter assembly 4. Compared to a pneumatic cylinder, the cushioning effect of the hydraulic cylinder 12 ensures more stable cutting by the cutter assembly 4 and a smoother cut surface.

[0042] Specifically, if Figure 1-2 As shown, when the elastic driving member is set as a hydraulic cylinder 12, the hydraulic cylinder 12 includes a cylinder barrel 122 and a cylinder head 123. The cylinder barrel 122 is connected to the base 2, and the piston rod 121 is passed through the cylinder head 123 and connected to the cylinder barrel 122. The cylinder head 123 is configured to be detachably connected to the cylinder barrel 122 to facilitate the removal of the piston rod 121, thereby improving the convenience of installing and replacing the piston rod 121 of the hydraulic cylinder 12. When the piston rod 121 is worn, the piston rod 121 can be quickly replaced, thereby improving the reliability and service life of the knife dropping device. Furthermore, the cylinder head 123 can be interference-fitted on the cylinder barrel 122 to ensure the internal sealing of the hydraulic cylinder 12, while facilitating the removal of the cylinder head 123, making the entire knife dropping device more concise and convenient to use.

[0043] Preferably, the deadweight assembly 1 further includes a tray 13, which is fixedly connected to the piston rod 121 of the pneumatic or hydraulic cylinder 12. The tray 13 is used to hold the weight 11. When using the drop cutter device to cut a CRB specimen, the weight 11 should first be placed into the tray 13. Under the action of the weight 11, the tray 13 drives the piston rod 121 fixedly connected to it downward, causing the deadweight assembly 1 to drive the cutter assembly 4, causing it to rotate around the bracket 3 toward the base 2.

[0044] In the embodiment of the present invention, Figure 1 and Figure 3As shown, to facilitate the placement of a narrow and sufficiently sharp blade within the tool assembly 4, the tool assembly 4 in this embodiment includes a tool 41 and a tool holder 42. The tool holder 42 is provided with a blade groove 43 capable of holding the tool 41. One end of the tool holder 42 is hingedly connected to the support 3, and the other end of the tool holder 42 is fixedly connected to the elastic drive member. Specifically, the tool 41 is disposed within the blade groove 43. The operator can select a narrow and sufficiently sharp tool 41 and secure it within the blade groove 43 within the tool holder 42. When the tool holder 42 rotates along the support 3 under the action of the piston rod 121, it drives the tool 41 fixed within the tool holder 42 to rotate along the support 3 and cut at the central circumferential position of the CRB specimen, ensuring that the crack opening is controlled within the narrow range of the tool 41 width, thereby simultaneously meeting the requirements of a narrow crack opening width and a smooth incision.

[0045] Optionally, the cutter 41 can be a utility blade, which has a width of approximately 0.4 mm to 0.7 mm. The blade can be regularly replaced to maintain the sharpness of the cutter 41, thereby meeting the requirements of a small crack opening and a smooth incision surface. Furthermore, because utility blades are affordable, regular replacement of the cutter 41 will not significantly increase processing costs.

[0046] To facilitate replacement of the cutting tool 41, ensure the sharpness of the cutting tool 41, and secure the cutting tool 41, the cutting tool holder 42 includes a cutting tool holder body 421 and a clamp 422. The clamp 422 is detachably connected to the cutting tool holder body 421, and a cutting tool slot 43 is formed between the clamp 422 and the cutting tool holder body 421 to clamp the cutting tool 41. One end of the cutting tool holder body 421 is hinged to the bracket 3. The cutting tool holder body 421 may be provided with a cylindrical hole 32, and the bracket 3 is provided with a pin 31 at a position corresponding to the cylindrical hole 32. The cutting tool holder body 421 is hinged to the bracket 3 through the cylindrical hole 32 and the pin 31, allowing the cutting tool holder body 421 to rotate along the bracket 3. Because the clamp 422 is detachably connected to the cutting tool holder body 421, the clamp 422 can be removed from the cutting tool holder body 421 to remove the cutting tool 41 from the cutting tool slot 43, facilitating replacement of the cutting tool 41.

[0047] Specifically, if Figure 3As shown, fastening components 44 are provided at corresponding positions of the tool holder body 421 and the clamp 422 to fix the clamp 422 to the tool holder body 421. The clamp 422 is tightened by the fastening component 44, thereby reducing the space in the tool groove 43 and clamping the tool 41. Optionally, the fastening component 44 can be configured as a threaded connection structure, that is, a threaded hole can be provided on the tool holder body 421, and a threaded through hole is also provided on the clamp 422 at a position corresponding to the threaded hole of the tool holder body 421. The clamp 422 is fastened to the tool holder body 421 by bolts. When the tool 41 needs to be replaced, the clamp 422 can be removed from the tool holder body 421 by screwing the bolts. In other words, the threaded connection between the tool holder body 421 and the clamp 422 enables the replacement and fixation of the tool 41. In this embodiment, four threaded holes are provided at corresponding positions of the tool holder body 421 and the clamp 422, which improves the clamping force. At the same time, the positions of the four threaded holes are symmetrically arranged, which improves the stability of the tool assembly 4 and avoids reducing the strength of the tool assembly 4 due to too many threaded holes.

[0048] Preferably, an anti-slip member 45 is provided in the knife groove 43 to further secure the knife 41 in the knife groove 43, thereby preventing the knife 41 from sliding relative to the knife groove 43 and affecting the cutting effect of the knife 41. The anti-slip member 45 can be a rubber pad, which utilizes the property of rubber to sag under external pressure to form an arc-shaped contact surface to increase resistance and form an anti-slip surface. The provision of the rubber pad increases the friction of the knife 41 in the knife assembly 4, thereby improving the cutting stability of the knife 41.

[0049] In the embodiment of the present invention, Figure 1 As shown, to ensure that the cutter 41 can cut the CRB specimen vertically, a bubble level 5 is provided on both the base 2 and the cutter assembly 4 to check whether the cutter assembly 4 is level with the base 2. The bubble level 5 uses the characteristic of the bubble maintaining the highest position in the glass tube to determine whether the base 2 and the cutter assembly 4 are level based on the position of the bubble. When the cutter assembly 4 and the bubble level 5 on the base 2 are both at the same scale, it means that the cutter assembly 4 is parallel to the base 2. Before cutting the CRB specimen, the position of the base 2 and the piston rod 121 should be repeatedly adjusted so that when the cutter assembly 4 is parallel to the base 2, the tip of the cutter 41 just contacts the outer surface of the central annular portion of the CRB specimen, and the height of the bracket 3 is consistent with the height of the central axis of the CRB specimen, so as to ensure that the tip of the cutter 41 is perpendicular to the central axis of the CRB specimen and that the cutter 41 cuts the CRB specimen vertically.

[0050] To adjust the position of the base 2 and the tool assembly 4, the depth of the crack cut by the tool assembly 4 can be adjusted, such as Figure 1 and Figure 4As shown, the cutting device further includes a moving component 6 mounted on the base 2. The base 2 is provided with a slide groove 23 that cooperates with the moving component 6. The moving component 6 can slide horizontally relative to the base 2. The bracket 3 and the deadweight assembly 1 are both fixedly connected to the moving component 6. Since, in the initial state, the position of the cutting device has been adjusted to ensure that it just contacts the outer surface of the CRB specimen by adjusting the position of the base 2 and the piston rod 121, the distance between the cutting tool assembly 4 and the CRB specimen can be controlled by adjusting the position of the moving component 6 relative to the base 2, thereby controlling the depth of the crack cut by the cutting tool assembly 4, thereby achieving crack processing on the surface of the CRB specimen.

[0051] Alternatively, as Figure 4 As shown, the movable component 6 is set to a trapezoidal structure, and the slide groove 23 is correspondingly set to a trapezoidal groove. By setting the trapezoidal structure, the stability of the movement of the movable component 6 is ensured. At the same time, the setting of the trapezoidal groove ensures that the movable component 6 can adjust its position along a straight line, which facilitates the position adjustment of the tool 41 along the horizontal direction.

[0052] Preferably, in order to further control the crack depth and improve the crack processing accuracy, a scale 21 is provided on the surface of the base 2, and a zero position line corresponding to the zero scale of the scale 21 is provided on the movable part 6. In the initial state of the knife drop device, the zero position line is aligned with the zero scale on the scale 21 to ensure that the movable part 6 is in the initial position. The scale 21 is used to calibrate the sliding distance of the movable part 6 along the base 2. By reading the scale value on the scale 21 corresponding to the zero position line, the moving distance of the movable part 6 can be judged, and the crack processing depth can be accurately controlled. According to the international standard ISO 18489, the pre-cracked round bar test under cyclic load requires a CRB specimen with a smaller crack depth. The pre-crack depth is set to 1.5mm with an error of ±0.15mm. Therefore, by moving the movable part 6 in the initial position to a position where its zero position line is aligned with the "1.5mm" scale on the scale 21, the crack processing depth can be controlled to 1.5mm, thereby ensuring the crack processing accuracy.

[0053] Furthermore, to prevent the movable component 6 from shifting during crack machining and affecting the machining effect, a fixing component 22 is provided on the base 2 to secure the movable component 6. By fixing the movable component 6 at a specified position according to the position of the scale 21 before cutting, the cutting position of the tool 41 can be further improved, ensuring that the tool 41 does not shift due to contact with the CRB specimen, thereby ensuring the machining accuracy of the crack. Optionally, the fixing component 22 can be equipped with a hexagon socket head bolt to fix the movable component 6 in place to ensure the crack machining depth.

[0054] For ease of understanding, combined Figure 1-4 The working steps of the knife dropping device in the embodiment of the present invention are described as follows:

[0055] The first step is to determine the initial position of the knife drop device;

[0056] First, the movable component 6 is fixed to the scale of "0mm" on the ruler 21 by the fixing component 22, which serves as the initial state of the movable component 6. Then, the tray 13 is unloaded, and the piston rod 121 is appropriately raised to make the tool assembly 4 present an elevation angle of about 30°. Subsequently, the position of the moving base 2 and the piston rod 121 is moved to ensure that when the tool assembly 4 falls from the elevation state to the parallel state with the base 2, the parallel state is a state in which the tool assembly 4 and the bubble level 5 on the base 2 are located at the same scale, the tip of the tool 41 contacts the outer surface of the central circumferential position of the CRB specimen, and the height of the bracket 3 is consistent with the height of the central axis of the CRB specimen. At this time, the tip of the tool 41 is perpendicular to the central axis of the CRB specimen.

[0057] The second step is to control the crack cutting depth;

[0058] First, loosen component 22 and move movable component 6 a short distance away from the CRB specimen. Simultaneously, raise piston rod 121 appropriately, repositioning tool assembly 4 at an approximately 30° elevation angle. Next, move movable component 6 toward the CRB specimen until it reaches the 1.5 mm mark on scale 21. Ensure that tool assembly 41 does not contact the CRB specimen during this step.

[0059] In the third step, cracks were machined on the surface of the CRB specimen.

[0060] As the cutter assembly 4 gradually descends, the cutter 41 gradually approaches the CRB specimen. The specimen is rotated at 100 rpm, and a weight 11 is placed on the tray 13. It is recommended that the weight of the weight 11 be selected to be at least 50% of the weight of the entire cutter assembly. Then, under the action of the deadweight assembly 1, the cutter 41 steadily descends to contact the CRB specimen and completes the crack processing.

[0061] It is worth noting that the embodiments of the present invention use CRB sample cutting as an example. The knife-dropping device proposed in the present invention can also be used for crack processing of other samples. The specific processing sample is selected according to actual conditions and is not specifically limited here.

[0062] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A knife dropping device, characterized in that: Used for cutting CRB specimens, including: Base (2); a bracket (3), the bracket (3) being vertically fixed on the base (2); A tool assembly (4), one end of the tool assembly (4) is hinged to the bracket (3); A self-weight assembly (1) comprises a weight (11) and an elastic driving member, wherein one end of the elastic driving member is connected to the base (2) and the other end is connected to the tool assembly (4), and the elastic driving member can drive the tool assembly (4) to rotate relative to the bracket (3) in a direction away from the base (2); The weight (11) is detachably connected to the elastic driving member and can drive the tool assembly (4) to rotate around the bracket (3) in a direction close to the base (2); The knife-dropping device further comprises a moving component (6) mounted on the base (2), wherein the moving component (6) is capable of sliding horizontally relative to the base (2), and the bracket (3) and the self-weight component (1) are both fixedly connected to the moving component (6); Before cutting the CRB specimen, the position of the knife drop device is repeatedly adjusted so that when the knife assembly (4) is located in a position parallel to the base (2), the tip of the knife assembly (4) just contacts the outer surface of the central annular portion of the CRB specimen, and the height of the bracket (3) is consistent with the height of the central axis of the CRB specimen.

2. The knife dropping device according to claim 1, characterized in that: The tool assembly (4) comprises: Cutting tool (41); A tool holder (42) is provided with a tool groove (43) capable of clamping the tool (41); one end of the tool holder (42) is hinged to the bracket (3); and the other end of the tool holder (42) is fixedly connected to the elastic driving member.

3. The knife dropping device according to claim 2, characterized in that: The tool holder (42) includes a tool holder body (421) and a clamp (422), wherein the clamp (422) is detachably connected to the tool holder body (421), and a tool groove (43) for clamping the tool (41) is formed between the clamp (422) and the tool holder body (421).

4. The knife dropping device according to claim 2, characterized in that: An anti-slip part (45) is provided in the knife groove (43).

5. The knife dropping device according to any one of claims 1 to 4, characterized in that: A bubble level (5) is provided on both the base (2) and the tool assembly (4) to check whether the tool assembly (4) and the base (2) are level.

6. The knife dropping device according to claim 1, characterized in that: A scale (21) is provided on the surface of the base (2), and a zero line corresponding to the zero scale of the scale (21) is provided on the movable component (6). The scale (21) is used to calibrate the sliding distance of the movable component (6) along the base (2).

7. The knife dropping device according to claim 1, characterized in that: A fixing component (22) is provided on the base (2), and the fixing component (22) is used to fix the position of the moving component (6).

8. The knife dropping device according to any one of claims 1 to 4, characterized in that: The elastic driving member is a hydraulic cylinder or a pneumatic cylinder.

9. The knife dropping device according to claim 8, characterized in that: The self-weight assembly (1) further comprises a tray (13), wherein the tray (13) is fixedly connected to the piston rod (121) of the air cylinder or the hydraulic cylinder (12), and the tray (13) is used for placing the heavy object (11).

Images