A clamping device for a locking hook

Abstract

This invention discloses a locking hook clamping device located on a horizontal workbench, including a base plate; the top surface of the base plate is provided with an inclined positioning block and a backing plate; a rough-machined blank of the locking hook is placed on the top of the inclined positioning block; the upper part of the backing plate is connected to the rear end of a double-ended bolt; the top surface of the middle part of the double-ended bolt contacts the upper hook recess of the hook head of the rough-machined blank of the locking hook; the front end of the double-ended bolt is connected to a nut after passing through a pressure plate; the hook head is located in the gap between the backing plate and the pressure plate; the left end of the inclined positioning block has a vertical positioning block; the vertical positioning block extends into the through groove C of the lower half of the hook head; a first positioning shaft is used to longitudinally penetrate and insert into two coarse reference holes of the hook head and abut against the left end of the inclined positioning block; a second positioning shaft is used to longitudinally penetrate and insert into two fine reference holes of the hook head and abut against the left end of the inclined positioning block; this invention saves on device manufacturing costs by using a method of replacing the positioning shaft to position the coarse reference holes and fine reference holes on the locking hook respectively.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a clamping device for a locking hook. Background Technology

[0002] See Figures 1a to 1h As shown, the finished locking hook 100 is a part of the external locking device. It has an irregularly shaped flat hook and a hook head 101 at its left end. The hook head 101 has a longitudinally penetrating hole A on both its front and rear sides, symmetrically distributed. The lower half of the hook head 101 has a transversely penetrating groove C. The upper part of the hook head 101 has a precision-machined inclined groove D as required by the drawing. The bottom surface (i.e., the bottom) of the precision-machined inclined groove D is an inclined surface E (i.e., a precision-machined inclined surface E) as required by the drawing. A positioning straight surface B is provided on the lower middle side of the locking hook 101. Both the front and rear sides of the hook head 101 are end positioning surfaces K.

[0003] Figure 2a A three-dimensional structural diagram of a rough-machined blank 200 with a locking hook, which requires machining operations on the finishing groove D and the finishing inclined surface E at the bottom of the finishing groove D.

[0004] See Figures 2a to 2f As shown, the rough-machined blank 200 of the lock hook (i.e., the rough-machined blank lock hook) has an irregular flat hook shape. Its left end has a hook head. The front and rear sides of the hook head 101 each have a hole A′ pre-drilled with machining allowance after rough machining (i.e., a pre-drilled rough reference hole A′). The two rough reference holes A′ are symmetrically distributed front and rear. The lower half of the hook head 101 has a transverse through-slot C, and the lower middle part of the lock hook 101 has a positioning surface B. Both the front and rear sides of the hook head 101 are end positioning surfaces K.

[0005] For the rough-machined blank 200 of the lock hook, the upper part of the hook head 101 at the left end is in a completely sealed state at this time, without any grooves being machined (e.g., no finishing groove D that needs to be machined).

[0006] In order to obtain a finishing groove D on the rough-machined blank 200 of the lock hook, and to obtain a slope E (i.e., finishing slope E) of the required dimensions in the drawing at the bottom of the finishing groove D, the straight-line distance L between the slope E at the bottom of the finishing groove D and the center point of the hole A is a critical dimension.

[0007] During processing, see Figures 2a to 3bAs shown, firstly, taking the pre-existing rough reference hole A (two rough reference holes A′ located on the front and rear sides of the hook head 101) and the positioning straight surface B on the left end of the rough-machined blank 200 of the hook as references, a rough machining groove D′ is obtained by rough machining. The bottom surface of the rough machining groove D′ is the inclined surface E′ (i.e., the rough machining inclined surface E′). The rough machining inclined surface E′ is parallel to the inclined surface E (i.e., the finishing inclined surface E) required by the drawing and has a preset distance gap.

[0008] Then, using existing machining equipment and methods, the rough datum hole A′ is finished to the size required in the drawing (the center point of the fine datum hole A′ is the same as that of the rough datum hole A′). Then, using the fine datum hole A and the positioning surface B as references, the rough-machined inclined groove D′ is finished again to obtain the finished inclined groove D. See [link to documentation]. Figure 1a , Figure 1b The bottom surface of the finished product's locking hook 100, with the precision-machined inclined groove D, is the inclined surface E required by the drawing (i.e., the precision-machined inclined surface E). In other words, the rough-machined inclined surface E′ is precision-machined to the inclined surface E required by the drawing (i.e., the precision-machined inclined surface E).

[0009] It should be noted that, using existing machining equipment, the rough datum hole A′ can be precision machined to the size required by the drawing. The relevant machining techniques are well-known and will not be described in detail here.

[0010] Currently, in order to perform machining operations on the roughing groove D′ with the roughing slope E′ and the finishing groove D with the finishing slope E respectively after positioning the roughing datum hole A′ and the finishing datum hole A′, two sets of locking hook positioning devices are required. The roughing blank 200 of the locking hook is clamped twice. Therefore, the manufacturing cost and procurement expenditure of the device are increased, that is, the hardware cost is increased.

[0011] Furthermore, by using two sets of locking hook positioning devices to clamp the rough-machined blank 200 of the locking hook twice, positioning and machining errors will inevitably occur, affecting the final dimensional accuracy of the locking hook part.

[0012] Therefore, there is an urgent need to develop a technology that can solve the above-mentioned technical problems. Summary of the Invention

[0013] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a clamping device for a locking hook.

[0014] Therefore, the present invention provides a clamping device for a lock hook, located on a horizontal workbench, which includes a base plate, a backing plate, an inclined positioning block, a pressure plate, a double-ended bolt, a nut, a first positioning shaft, and a second positioning shaft;

[0015] The top surface of the base plate has horizontally distributed inclined positioning blocks and horizontally distributed backing plates, respectively, which are vertically arranged in the middle and rear of the base plate.

[0016] The top of the angled positioning block is used to place the rough-machined blank of the lock hook to be processed;

[0017] The upper left side of the backplate is connected to the rear end of a longitudinally distributed double-headed bolt;

[0018] The top surface of the double-ended bolt is used to contact the upper hook recess F on the inner side of the hook head at the left end of the rough-machined blank of the lock hook.

[0019] A U-shaped opening is longitudinally provided at the bottom of the pressure plate;

[0020] The front end of the double-ended bolt passes through the U-shaped opening of the pressure plate and is then threadedly fixed to a nut.

[0021] The hook head is located in the gap between the back plate and the pressure plate;

[0022] The backing plate and pressure plate are used to clamp the hook head at the left end of the rough-machined blank of the locking hook by means of double-ended bolts and nuts;

[0023] A positioning bevel is provided on the right side of the top surface of the bevel positioning block;

[0024] The locating inclined surface of the inclined locating block is in contact with the locating straight surface B on the lower side of the middle of the rough-machined blank of the locking hook;

[0025] The left end of the oblique positioning block has a vertical positioning block protruding to the left;

[0026] The vertical positioning block extends to the left into the through groove C of the lower half of the hook head at the left end of the rough-machined blank of the locking hook;

[0027] The first positioning shaft is used to longitudinally penetrate into the two rough reference holes A′ that were originally present on the front and rear sides of the hook head on the left side of the rough-machined blank of the lock hook when it is necessary to position them. Its right side is in close contact with the left end face of the vertical positioning block at the left end of the inclined positioning block.

[0028] The second positioning shaft is used to position the two precision reference holes A formed by machining on the front and rear sides of the hook head on the left side of the rough-machined blank of the lock hook. It is inserted longitudinally into the two precision reference holes A, and its right side is in close contact with the left end face of the vertical positioning block at the left end of the inclined positioning block.

[0029] Among them, the center point of the coarse datum hole A′ is the same as that of the fine datum hole A;

[0030] The diameter of the fine reference hole A is larger than the diameter of the coarse reference hole A′.

[0031] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a clamping device for a lock hook. Its structure is scientifically designed. By changing the positioning shaft, the rough reference hole A′ and the fine reference hole A obtained successively on the rough-machined blank of the lock hook are positioned respectively. Only one set of devices is needed to complete the two clamping operations of the rough-machined blank of the lock hook, saving the manufacturing cost of the device and having significant practical significance.

[0032] Furthermore, the second positioning shaft 8 of the present invention, by adopting a stepped shaft structure (i.e., a stepped shaft structure), compensates for the positioning difference between the fine reference hole A and the device positioning surface B. In the two rough and fine hole positioning clamping operations performed on the rough-machined blank of the lock hook (i.e., positioning clamping based on the rough reference hole and the fine reference hole), the vertical height position of the fine-machined inclined surface E of the rough-machined blank of the lock hook remains consistent. This ensures that the position of the rough-machined blank of the lock hook to be machined in the clamping device of the present invention does not change due to the two clamping operations, effectively avoiding positioning errors.

[0033] After testing, the clamping device for the lock hook provided by this invention is convenient and quick to operate. Even if the rough-machined blank of the lock hook is clamped twice, the positioning error is effectively avoided, thus ensuring the machining accuracy of the rough-machined blank of the lock hook by existing machine tools. Attached Figure Description

[0034] Figure 1a This is a three-dimensional structural diagram of a finished locking hook after the finishing operations of the precision-machined slant D and precision-machined inclined surface E have been completed.

[0035] Figure 1b This is a front view of a finished locking hook after the finishing operations of the finished slant D and the finished inclined surface E have been completed.

[0036] Figures 1c to 1g These are the front view, left view, right view, top view, and bottom view of a finished locking hook after the finishing operation of the inclined surface E has been completed;

[0037] Figure 1h A schematic diagram showing the positional relationship between the rough reference hole A′ and the fine reference hole A formed sequentially in the rough-machined blank of the lock hook to be clamped, provided by the present invention;

[0038] Figure 2a This is a three-dimensional structural diagram of a rough-machined blank for a locking hook, which requires machining of the finishing groove D and the finishing inclined surface E at the bottom of the finishing groove D; that is, a three-dimensional structural diagram of a rough-machined blank for a locking hook before machining of the finishing groove D and the finishing inclined surface E at the bottom of the finishing groove D.

[0039] Figure 2bLeft view of a rough-machined blank with a locking hook, which requires machining operations for the finishing groove D and the finishing slope E at the bottom of the finishing groove D.

[0040] Figure 2c The right view of a rough-machined blank with a locking hook, which requires machining operations for the finishing groove D and the finishing slope E at the bottom of the finishing groove D.

[0041] Figure 2d This is a front view of a rough-machined blank with a locking hook, which requires machining operations for the finishing groove D and the finishing slope E at the bottom of the finishing groove D.

[0042] Figure 2e A bottom view of a rough-machined blank with a locking hook, which requires machining operations for the finishing groove D and the finishing slope E at the bottom of the finishing groove D.

[0043] Figure 2f This is a top view of a rough-machined blank with a locking hook, which requires machining operations for the finishing groove D and the finishing inclined surface E at the bottom of the finishing groove D.

[0044] Figure 3a for Figure 2a The diagram shows the three-dimensional structure of the rough-machined blank of the lock hook, which is positioned by the rough reference hole A′, the positioning straight surface B and the end positioning surface K, and then rough-machined to obtain the rough-machined groove D′.

[0045] Figure 3b for Figure 2a The front view of the rough-machined blank of the lock hook shown, after being positioned by the rough reference hole A′, the positioning straight surface B and the end positioning surface K, and then rough-machined to obtain the rough-machined groove D′;

[0046] Figure 3c Left view of the rough-machined blank for obtaining the rough-machined groove D′;

[0047] Figure 3d Left view of the rough-machined blank for the locking hook with the finished groove D;

[0048] Figure 3e This is a schematic diagram showing the relationship between the machining allowance β between the roughing groove D′ and the finishing groove D in the roughing blank of the lock hook;

[0049] Figure 4a The front view of the clamping device for a lock hook provided by the present invention shows that the first positioning shaft is inserted into the rough reference hole A′ to clamp the rough-machined blank of the lock hook, thereby enabling existing machining center machine tools to rough-machine the lock hook to the rough-machined inclined surface E′.

[0050] Figure 4bThe present invention provides a front view of a clamping device for a lock hook, which inserts a second positioning shaft into a fine reference hole A to clamp the rough-machined blank of the lock hook. This allows existing machining centers to process the rough-machined inclined surface E′ on the rough-machined blank of the lock hook to obtain the fine-machined inclined surface E.

[0051] Figure 4c The left view of a clamping device for a lock hook provided by the present invention shows the clamping operation of the rough-machined blank of the lock hook by inserting the first positioning shaft into the rough reference hole A′. At this time, the rough-machined blank of the lock hook is omitted.

[0052] Figure 4d The left view of a locking hook clamping device provided by the present invention shows a locking hook roughing blank clamping operation by inserting a second positioning shaft into a fine reference hole A. At this time, the roughing blank of the locking hook is omitted.

[0053] Figure 5a A top view of the base plate of a locking hook clamping device provided by the present invention;

[0054] Figure 5b A front view of the base plate of a locking hook clamping device provided by the present invention, the view being partially sectional;

[0055] Figure 5c A left view of the base plate of a locking hook clamping device provided by the present invention, the view being partially cross-sectional;

[0056] Figure 6a A front view of a backing plate in a locking hook clamping device provided by the present invention;

[0057] Figure 6b A bottom view of the backing plate of a locking hook clamping device provided by the present invention;

[0058] Figure 7a A front view of the inclined positioning block of a locking hook clamping device provided by the present invention;

[0059] Figure 7b A left view of the inclined positioning block in a locking hook clamping device provided by the present invention;

[0060] Figure 7c A top view of an inclined positioning block in a locking hook clamping device provided by the present invention;

[0061] Figure 8a A front view of the pressure plate of a locking hook clamping device provided by the present invention;

[0062] Figure 8b A left view of the pressure plate of a locking hook clamping device provided by the present invention, which is partially cross-sectional;

[0063] Figure 9 A top view of a double-headed bolt in a locking hook clamping device provided by the present invention;

[0064] Figure 10a A front view of a nut included in a locking hook clamping device provided by the present invention;

[0065] Figure 10b A left view of a nut included in a locking hook clamping device provided by the present invention;

[0066] Figure 11 A top view of a locking hook clamping device provided by the present invention, having a first positioning axis;

[0067] Figure 12 A top view of a locking hook clamping device provided by the present invention, having a second positioning axis.

[0068] In the diagram, 1. base plate, 2. backing plate, 3. inclined positioning block, 4. pressure plate, 5. double-ended bolt;

[0069] 6. Nut, 7. First positioning shaft, 8. Second positioning shaft, 9. Mounting screw hole for backplate, 10. Mounting pin hole for backplate;

[0070] 11. Screw hole for inclined positioning block; 12. Pin hole for inclined positioning block; 13. Threaded hole for backing plate; 14. Pin hole for backing plate; 15. Hole for double-ended bolt.

[0071] 16. Vertical positioning block; 17. Hook head arc surface G receiving groove; 18. Positioning bevel; 19. Annular boss; 20. Annular chamfer.

[0072] 21. U-shaped opening, 22. Positioning straight shaft, 23. First positioning shaft handle, 24. Intermediate thin shaft, 25. Coarse shaft, 26. Stepped shaft handle. Detailed Implementation

[0073] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0074] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0075] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0076] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0077] See Figures 1a to 12 The present invention provides a clamping device for a lock hook, located on a horizontal workbench, which includes a base plate 1, a backing plate 2, an inclined positioning block 3, a pressure plate 4, a double-ended bolt 5, a nut 6, a first positioning shaft 7, and a second positioning shaft 8.

[0078] The top surface of the base plate 1 has horizontally distributed inclined positioning blocks 3 and horizontally distributed backing plates 2, respectively, which are vertically arranged in the middle and rear of the base plate 1.

[0079] The top of the inclined positioning block 3 is used to place the rough-machined blank 200 of the lock hook to be processed;

[0080] It should be noted that, see Figures 2a to 2fAs shown, the rough-machined blank 200 of the lock hook (i.e., the rough-machined blank lock hook) has an irregular flat hook shape. Its left end has a hook head. The front and rear sides of the hook head 101 each have a pre-existing rough-machined hole A′ (i.e., a pre-existing rough reference hole A′). The two rough reference holes A′ are symmetrically distributed front and rear. The lower half of the hook head 101 has a transverse through-slot C, and the lower middle part of the lock hook 101 has a positioning surface B. Both the front and rear sides of the hook head 101 are end positioning surfaces K. For the rough-machined blank 200 of the lock hook, the upper part of the hook head 101 at its left end is completely sealed at this time, without any machined grooves (e.g., no finishing oblique groove D that needs to be machined).

[0081] Specifically, for the rough-machined blank 200 of the lock hook, a finishing groove D needs to be machined on the rough-machined blank 200, and a slope E (i.e., finishing slope E) of the required dimensions in the drawing needs to be machined at the bottom of the finishing groove D. The straight-line distance L between the slope E at the bottom of the finishing groove D and the center point of the hole A is a critical dimension.

[0082] On the upper left side of the back plate 2, there is a longitudinal through double-headed bolt mounting hole 15;

[0083] The double-ended bolt mounting hole 15 is located to the left of the inclined positioning block 3;

[0084] The double-ended bolt mounting hole 15 is threaded to the rear end of a longitudinally distributed double-ended bolt 5;

[0085] The top surface of the double-ended bolt 5 is used to contact the upper hook socket F inside the hook head 101 at the left end of the rough-machined blank 200 of the lock hook.

[0086] A U-shaped opening 21 is longitudinally provided at the lower part of the pressure plate 4;

[0087] The front end of the double-ended bolt 5 passes through the U-shaped opening 21 of the pressure plate 4 and is then threadedly fixed to a nut 6.

[0088] Hook 101 is located in the gap between the back plate 2 and the pressure plate 4;

[0089] The backing plate 2 and the pressure plate 4 are used to clamp the hook head 101 at the left end of the rough-machined blank 200 of the locking hook by means of the double-headed bolt 5 and the nut 6.

[0090] A positioning inclined surface 18 is provided on the right side of the top surface of the inclined positioning block 3;

[0091] The height of the positioning ramp 18 gradually decreases from left to right;

[0092] The positioning inclined surface 18 of the inclined positioning block 3 is in contact with the positioning straight surface B on the lower side of the middle part of the rough machined blank 200 of the locking hook.

[0093] The left end of the inclined positioning block 3 has a vertical positioning block 16 protruding to the left;

[0094] The vertical positioning block 16 extends to the left into the through groove C of the lower half of the hook head 101 at the left end of the rough-machined blank 200 of the locking hook.

[0095] The first positioning shaft 7 is used to position the two rough reference holes A′ originally present on the front and rear sides of the hook head 101 at the left end of the rough machining blank 200 of the lock hook so that the existing machining center machine tool can process the rough machining blank 200 of the lock hook to obtain the rough machining inclined surface E′ (i.e. the bottom surface of the rough machining groove D′). Its longitudinal direction is inserted into the two rough reference holes A′, and its right side is in close contact with the left end face of the vertical positioning block 16 at the left end of the inclined positioning block 3.

[0096] The second positioning shaft 8 is used to position the two precision reference holes A formed on the front and rear sides of the hook head 101 at the left end of the rough-machined blank 200 of the lock hook, so that the existing machining center machine tool can process the rough-machined inclined surface E′ on the rough-machined blank 200 of the lock hook to obtain the precision-machined inclined surface EE (i.e. the bottom surface of the precision-machined inclined groove D). Its longitudinal direction is inserted into the two precision reference holes A, and its right side is in close contact with the left end face of the vertical positioning block 16 at the left end of the inclined positioning block 3.

[0097] Among them, the coarse datum hole A′ and the fine datum hole A have the same center point (they have the same central axis, only the hole diameter is different); the hole diameter of the fine datum hole A is larger than the hole diameter of the coarse datum hole A′.

[0098] Among them, the roughing inclined surface E′ and the finishing inclined surface E are parallel to each other and have a preset interval distance (i.e. β);

[0099] Both the roughing inclined plane E′ and the finishing inclined plane E are parallel to the horizontal worktable (i.e., parallel to the horizontal plane).

[0100] It should be noted that the two rough reference holes A′ are two holes that were pre-machined on the rough machining blank 200 of the lock hook.

[0101] In this invention, specifically, the pressure plate 4 is a circular open pad;

[0102] The rear perimeter of the pressure plate 4 is provided with a rearwardly protruding annular boss 19.

[0103] The front four sides of the pressure plate 4 are surrounded by annular chamfers 20.

[0104] In practice, the U-shaped opening 21 on the pressure plate 4 and the double-headed bolt 5 are in clearance fit.

[0105] In practice, the width of the U-shaped opening 21 on the pressure plate 4 is 1mm larger than the shaft diameter of the double-ended bolt 5.

[0106] In this invention, for specific implementation, see [link to relevant documentation]. Figure 7a As shown, the angle between the positioning inclined surface 18 of the inclined positioning block 3 and the bottom reference surface M of the inclined positioning block 3 is α′;

[0107] See Figure 1c As shown, the included angle α′ is equal to the included angle α between the rough machining inclined surface E′ (i.e. the bottom surface of the rough machining groove D′) that needs to be machined on the rough machining blank 200 of the lock hook and the workpiece positioning straight surface B, and is also equal to the included angle α between the finish machining inclined surface E (i.e. the bottom surface of the finish machining groove D) that needs to be machined on the finished lock hook 100 and the workpiece positioning straight surface B.

[0108] The rough-machined inclined surface E′ is the bottom surface of the rough-machined inclined groove D′ that needs to be machined on the rough-machined blank 200 of the lock hook;

[0109] The finishing inclined surface E is the bottom surface of the finishing inclined groove D that needs to be machined on the rough-machined blank 200 of the lock hook.

[0110] The roughing inclined surface E′ and the finishing inclined surface E are parallel to each other and have a preset interval distance β;

[0111] Both the roughing inclined plane E′ and the finishing inclined plane E are parallel to the horizontal worktable.

[0112] It should be noted that, see Figure 3c , Figure 3d and Figure 3e As shown, for the rough-machined inclined groove D′, its bottom surface is the rough-machined inclined surface E′, and its front and rear side walls are the E2 groove surface and the E1 groove surface;

[0113] For the precision-machined inclined groove D, its bottom surface is the precision-machined inclined surface E, and its front and rear side walls are the D2 groove surface and the D1 groove surface;

[0114] The roughing inclined surface E′ and the finishing inclined surface E are parallel to each other, and there is a preset interval β between them;

[0115] The E2 groove surface and the D2 groove surface are parallel to each other, and there is a preset interval β between them;

[0116] The E1 groove surface and the D1 groove surface are parallel to each other, and there is a preset interval β between them.

[0117] exist Figure 3c , Figure 3d In the diagram, N represents the width dimension of the precision-machined inclined groove D as required by the drawing.

[0118] In this invention, specifically, the vertical positioning block 16 and the through groove C of the lower half of the hook head 101 at the left end of the rough-machined blank 200 of the locking hook are in clearance fit.

[0119] In specific implementation, the thickness h of the vertical positioning block 16 is 10mm smaller than the width H of the through groove C of the lower half of the hook head 101 at the left end of the rough-machined blank 200 of the lock hook, so as to facilitate the loading and unloading of the lock hook 10 in the device of the present invention.

[0120] In this invention, for specific implementation, see [link to relevant documentation]. Figure 7c As shown, hook-head arc surface G receiving groove 17 is provided on the front and rear sides of the vertical positioning block 16 of the inclined positioning block 3.

[0121] See Figure 2a As shown, the hook head arc surface G receiving groove 17 is used to receive the hook head arc surface G on the lower right end of the left side of the hook head 101 on both sides of the rough-machined blank 200 of the lock hook.

[0122] In this invention, for specific implementation, see [link to relevant documentation]. Figure 11 As shown, the front and rear ends of the first positioning shaft 7 are the first positioning shaft handle 23 and the positioning straight shaft 22, respectively;

[0123] The positioning shaft 22 is used to be inserted longitudinally into the two rough reference holes A′ on the front and rear sides of the hook head 101 at the left end of the rough-machined blank 200 of the lock hook;

[0124] The positioning shaft 22 and the rough reference hole A′ are clearance fit;

[0125] The right side of the positioning shaft 22 is used to make tight contact with the left end face of the vertical positioning block 16 at the left end of the positioning block 3.

[0126] In practice, the shaft diameter b of the positioning shaft 22 is smaller than the diameter of the coarse reference hole A′ (specifically, smaller by 0.02mm to 0.04mm), which facilitates the loading and unloading of the first positioning shaft 7 in the coarse reference hole A′.

[0127] In this invention, for specific implementation, see [link to relevant documentation]. Figure 12 As shown, the second positioning axis 8 includes longitudinally distributed intermediate thin shafts 24;

[0128] The front and rear ends of the thin intermediate shaft 24 each have a thick shaft 25;

[0129] The thick shaft 25 located on the front side is connected to the stepped shaft handle 26;

[0130] The right side of the middle thin shaft 24 of the second positioning shaft 8 is used to make tight contact with the left end face of the vertical positioning block 16 at the left end of the positioning block 3.

[0131] In specific implementation, it should be noted that, for the present invention, the rear end of the second positioning shaft 8 is a positioning stepped shaft that is thin in the middle and thick at both ends. The shaft diameter b′ of the thin middle shaft 24 of the second positioning shaft 8 is the same as the shaft diameter b of the positioning straight shaft 22 of the first positioning shaft 7.

[0132] In practice, the diameter c of the coarse shaft 25 is smaller than the diameter of the fine reference hole A (specifically, smaller by 0.02mm to 0.04mm), and larger than the diameter of the intermediate fine shaft 24, thereby facilitating the loading and unloading of the second positioning shaft 8 in the fine reference hole A.

[0133] In this invention, specifically, the base plate 1 and the back plate 2 are connected by a plurality of back plate mounting screws and two back plate mounting positioning pins.

[0134] For specific implementation details, please refer to [link / reference]. Figure 5a , Figure 6b As shown, on the rear side of the top surface of the base plate 1, there are multiple horizontally spaced mounting screw holes 9 (not limited to three).

[0135] On the top surface of the base plate 1, there is a mounting pin hole 10 on each of the left and right sides of the multiple mounting screw holes 9.

[0136] At the bottom of the back plate 2, a back plate threaded hole 13 is provided at the position corresponding to each back plate mounting screw hole 9;

[0137] At the bottom of the back plate 2, a back plate pin hole 14 is provided at a position corresponding to each back plate mounting pin hole 10;

[0138] Each mounting screw for the backplate passes through a mounting screw hole 9 and is threaded into a corresponding threaded hole 13 in the backplate.

[0139] The upper and lower ends of each mounting pin of the backplate are connected to a backplate pin hole 14 and a backplate mounting pin hole 10, respectively.

[0140] In this invention, specifically, the base plate 1 and the inclined positioning block 3 are connected by an inclined positioning block mounting screw and an inclined positioning block positioning pin.

[0141] For specific implementation details, please refer to [link / reference]. Figure 5a , Figure 7c As shown, two inclined positioning block mounting screw holes 11 and two inclined positioning block mounting pin holes 12 are provided in the top center of the base plate 1.

[0142] At the bottom of the inclined positioning block 3, a threaded hole 301 is provided at a position corresponding to the mounting screw hole 11 of each inclined positioning block;

[0143] At the bottom of the inclined positioning block 3, an inclined positioning block pin hole 302 is provided at a position corresponding to the mounting pin hole 12 of each inclined positioning block;

[0144] Each inclined positioning block mounting screw (specifically an internal hex screw) passes through an inclined positioning block mounting screw hole 11 and is threaded into an inclined positioning block threaded hole 301 corresponding to its position.

[0145] The upper and lower ends of the positioning pin of each inclined positioning block are respectively connected to an inclined positioning block pin hole 302 and an inclined positioning block mounting pin hole 12.

[0146] To better understand the technical solution of the present invention, the working process of the present invention is described below.

[0147] The first step is to place the device of the present invention on a horizontal workbench and install the double-headed bolt 5 vertically on the back plate 4.

[0148] The second step is to place the positioning surface B of the workpiece to be processed (i.e. the rough-machined blank 200 of the lock hook) downward on the inclined positioning block 3 of the device of the present invention. The end positioning surface K of the workpiece is in close contact with the back plate 2. At this time, the top surface of the middle part of the double-headed bolt 5 is in contact with the upper hook socket F on the inner side of the hook head 101 at the left end of the rough-machined blank 200 of the lock hook.

[0149] In the third step, the first positioning shaft 7 is inserted into the two coarse reference holes A′ distributed on both sides of the through groove C of the workpiece hook 101. Under its own weight, the workpiece slides downward and to the right along the positioning inclined surface 18 on the top right side of the inclined positioning block 3 until the hook arc surface G at the lower right end of both sides of the workpiece hook 101 extends into the receiving groove 17 (at this time, the vertical positioning block 16 extends into the through groove C). At the same time, the right side of the first positioning shaft 7 abuts against the vertical positioning block 16 extending into the through groove C, and the positioning straight surface B of the workpiece is in close contact with the positioning inclined surface 18 at the top of the inclined positioning block 3.

[0150] The fourth step is to suspend the U-shaped opening 21 of the pressure plate 4 downwards on the double-headed bolt 5 on the back plate 4, and tighten the nut 6 at the front end of the double-headed bolt 5 so that the pressure plate 4 presses against the end positioning surface K of the hook 101 of the workpiece, thus completing the positioning and clamping of the workpiece.

[0151] Then, start the existing machining center machine tool to perform machining operations on the upper part of the hook head 101, and rough machine the rough machining blank 200 of the locking hook to obtain the rough machining groove D′. The bottom surface of the rough machining groove D′ is the rough machining inclined surface E′.

[0152] Among them, the roughing inclined surface E′ is parallel to the horizontal worktable (i.e., parallel to the horizontal plane).

[0153] It should be noted that, since the inclined surface E′ to be machined (i.e., the roughing inclined surface E′) and the inclined surface E required by the drawing (i.e., the finishing inclined surface E) are parallel to each other and have a gap, the roughing inclined surface E′ and the finishing inclined surface E are at an angle α with the positioning plane B of the workpiece, and the device of the present invention sets the positioning inclined surface 18 at the same angle as the angle α, the roughing inclined surface E′ at the bottom of the roughing groove D′ to be machined on the roughing blank 200 of the lock hook is parallel to the horizontal worktable (i.e. parallel to the horizontal plane). At this time, the existing machining center machine tool is started to perform machining operation on the upper part of the hook head 101, so that the roughing blank 200 of the lock hook can be rough machined to obtain the roughing groove D′, and the bottom surface of the roughing groove D′ is the roughing inclined surface E′.

[0154] It should be noted that, using existing vertical machining center equipment and end mills, the equipment is started, and the cutting range of the tool is set with the contact surface between the back plate 2 and the roughing blank 200 of the locking hook and the axis of the first positioning axis 7 as the reference. Then, the machine tool is started to perform left and right reciprocating cutting on the part to be machined for roughing, so as to obtain a roughing groove D′ with a roughing slope E′. The roughing slope E′ is parallel to the horizontal worktable (i.e., parallel to the horizontal plane).

[0155] Assuming that when rough machining the inclined surface (i.e., machining a rough machining inclined surface E′ of a rough machining groove D′), a machining allowance β is left, then the distance between the rough machining inclined surface E′ formed by rough machining and the axis of the first positioning axis 7 is equal to L+β.

[0156] It should be noted that the straight-line distance between the roughing inclined surface E′ at the bottom of the roughing inclined groove D′ and the finishing inclined surface E at the bottom of the finishing inclined groove D is equal to the machining allowance β. The value of β is greater than 0, and the magnitude of β depends on the amount of deformation of the locking hook workpiece caused by the heat treatment. The value of β is 1 to 2 mm larger than the theoretical deformation.

[0157] In order to continue processing to obtain a finished groove D with a finished inclined surface E as the bottom surface, it is necessary to further remove the rough-machined blank 200 of the lock hook from the device of the present invention and perform finishing on the two precision reference holes A, so that the hook head 101 on the left end of the rough-machined blank 200 of the lock hook forms two precision reference holes A on the front and rear sides; it should be noted that the specific processing operation of the two precision reference holes A is not related to this patent; the first to fourth steps above are positioning and clamping work for the machining of the rough-machined inclined surface E′.

[0158] It should be noted that the finishing operation for obtaining the precision datum hole A requires using existing clamping devices to horizontally place the rough-machined blank 200 of the locking hook, and then finishing it on an existing vertical machining center to obtain two precision datum holes A. It should also be noted that existing machining equipment can be used to finish the rough datum hole A′ to the precision datum hole A of the dimensions required by the drawing. Related machining techniques can be employed using existing and well-known technologies, which will not be elaborated here. The operation of obtaining the precision-machined hole A is not a problem to be solved or a function to be achieved by the technical solution of the device of this invention, and is unrelated to the design of this invention.

[0159] Then, repeat steps one and two above, and then perform the following steps:

[0160] Fifth, insert the second positioning shaft 8 into the two reference holes A distributed on the front and rear sides of the through groove C of the workpiece. Similarly, under its own weight, the workpiece slides downward and to the right along the positioning inclined surface 18 on the top right side of the inclined positioning block 3 until the hook arc surface G at the lower right end of the front and rear sides of the workpiece hook 101 extends into the receiving groove 17 (at this time, the vertical positioning block 16 extends into the through groove C). At the same time, the right side of the second positioning shaft 8 abuts against the left side of the vertical positioning block 16 extending into the through groove C, and the positioning straight surface B of the workpiece is in close contact with the positioning inclined surface 18 at the top of the inclined positioning block 3.

[0161] The sixth step is to suspend the U-shaped opening 21 of the pressure plate 4 downwards on the double-headed bolt 5 on the back plate 4, and tighten the nut 6 at the front end of the double-headed bolt 5 so that the pressure plate 4 presses against the end positioning surface K of the hook 101 of the workpiece, thus completing the positioning and clamping of the workpiece.

[0162] Then, start the existing machining center machine tool and continue to perform finishing operation on the roughing inclined surface E′ at the bottom of the roughing inclined groove D′ of the hook head 101, and finish the groove D with the finishing inclined surface E as the bottom surface.

[0163] Among them, the finishing inclined plane E is parallel to the roughing inclined plane E′ (i.e., parallel to the horizontal plane).

[0164] It should be noted that, since the finishing inclined surface E to be machined forms an angle α with the positioning straight surface B of the rough-machined blank 200 of the lock hook, and the device of the present invention sets the positioning inclined surface 18 at the same angle as the angle α, the finishing inclined surface E to be machined on the rough-machined blank 200 of the lock hook is parallel to the horizontal worktable (and also parallel to the rough-machined inclined surface E′). At this time, by starting the existing machining center machine tool, the machining allowance β left in the rough machining (that is, equal to the straight distance between the rough-machined inclined surface E′ at the bottom of the rough-machined groove D′ and the finishing inclined surface E at the bottom of the finishing groove D) can be machined to the finishing inclined surface E (the distance between the finishing inclined surface E and the axis of the second positioning 8 is L), thereby obtaining the finishing groove D.

[0165] In terms of specific implementation, it should be noted that by using existing vertical machine tool machining center equipment and end mills, starting the equipment, taking the contact surface between the vertical plate and the workpiece as the reference and the axis of the second positioning axis 8 as the reference, setting the cutting range of the tool, and then starting the machine tool to perform left and right reciprocating cutting on the part to be machined (including the roughing inclined surface E′ at the bottom of the roughing inclined groove D′ and the front and rear groove walls) for finishing, a finishing inclined groove D with a finishing inclined surface E can be obtained.

[0166] In this invention, Figure 4a In this context, Z is the height difference between the axis of the second positioning axis 8 (which is also the axis of the first positioning axis 7) and the worktable. This value Z is a constant and remains unchanged.

[0167] In this invention, it should be noted that, since only the intermediate thin shaft 24 is positioned against the left side of the vertical positioning block 16 in the second positioning shaft 8, and the shaft diameter b′ of the intermediate thin shaft 24 of the second positioning shaft 8 is consistent with the shaft diameter b of the positioning straight shaft 22 of the first positioning shaft 7, the vertical height position of the inclined surface E to be processed is consistent in the two rough and fine hole positioning clamping operations performed on the workpiece (i.e., positioning clamping based on the rough reference hole and the fine reference hole). At this time, the existing machining center machine tool is started to process away the machining allowance β left in the rough machining (i.e., equal to the straight distance between the rough machining inclined surface E′ at the bottom of the rough machining groove D′ and the fine machining inclined surface E at the bottom of the fine machining groove D). The rough machining inclined surface E′ at the bottom of the rough machining groove D′ of the rough machining blank 200 of the locking hook can be processed to the fine machining inclined surface E (the distance between the fine machining inclined surface E and the axis of the second positioning shaft 8 is L).

[0168] Based on the above technical solution, it can be seen that for this invention, firstly, taking the rough reference hole A′ and positioning surface B and positioning surface K on the rough-machined blank 200 of the locking hook positioned by the first positioning shaft 7 as references, a rough machining groove D′ (the bottom surface of the rough machining groove D′ is the rough machining inclined surface E′) is obtained on the upper part of the hook head 101 of the rough-machined blank 200 of the locking hook. The three sides of the rough machining groove D (i.e., the bottom surface and the front and rear side walls) all have a finishing allowance of β. Then, the workpiece is subjected to heat treatment (this process will cause oxidation on the surface of the workpiece). The leather will also deform, so machining allowance needs to be left. After heat treatment, fine machining is performed to ensure dimensional accuracy. Then, the existing machining is used to machine the rough datum hole A′ to the fine datum hole A. Then, with the fine datum hole A and the positioning surface B and positioning surface K positioned by the second positioning axis 8 as the reference, the rough machining groove D′ is machined to the fine machining groove D, that is, the machining allowance β of the three sides of the rough machining groove D′ is removed. Among them, the rough machining slope E′ at the bottom of the rough machining groove D′ can be machined to the fine machining slope E.

[0169] Compared with the prior art, the locking hook clamping device provided by the present invention has the following beneficial effects:

[0170] 1. The present invention uses a method of changing the positioning shaft to position the coarse reference hole A′ and the fine reference hole A on the lock hook respectively. At the same time, a stepped shaft structure is used to compensate for the positioning difference between the fine reference hole A and the positioning surface B of the device, so as to ensure that the position of the lock hook to be processed in the clamping device of the present invention does not change due to two clamping.

[0171] 2. By applying this invention, when using the precision reference hole for positioning and clamping for the second time, the first machining allowance can be removed.

[0172] 3. By setting the inclined positioning block, the present invention changes the inclined surface processing into horizontal surface processing. The weight of the workpiece itself causes the workpiece to slide down along the inclined positioning block in the device of the present invention, ensuring close contact between the positioning shaft and the vertical positioning surface, which is beneficial for positioning in the device.

[0173] 4. The application of the present invention only requires one set of devices to complete the positioning of the coarse reference hole A′ and the fine reference hole A on the lock hook, so as to cooperate with external machine tool equipment for processing operations. Unlike the prior art, it does not require two sets of devices, a coarse reference positioning device and a fine reference positioning device, to complete the processing operation.

[0174] In summary, compared with the prior art, the clamping device for the lock hook provided by the present invention has a scientifically designed structure. By changing the positioning shaft, the rough reference hole A′ and the fine reference hole A obtained successively on the rough-machined blank of the lock hook are positioned respectively. Only one set of devices is needed to complete the two clamping operations of the rough-machined blank of the lock hook, saving the manufacturing cost of the device and having significant practical significance.

[0175] Furthermore, the second positioning shaft 8 of the present invention, by adopting a stepped shaft structure (i.e., a stepped shaft structure), compensates for the positioning difference between the fine reference hole A and the device positioning surface B. In the two rough and fine hole positioning clamping operations performed on the rough-machined blank of the lock hook (i.e., positioning clamping based on the rough reference hole and the fine reference hole), the vertical height position of the fine-machined inclined surface E of the rough-machined blank of the lock hook remains consistent. This ensures that the position of the rough-machined blank of the lock hook to be machined in the clamping device of the present invention does not change due to the two clamping operations, effectively avoiding positioning errors.

[0176] After testing, the clamping device for the lock hook provided by this invention is convenient and quick to operate. Even if the rough-machined blank of the lock hook is clamped twice, the positioning error is effectively avoided, thus ensuring the machining accuracy of the rough-machined blank of the lock hook by existing machine tools.

[0177] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A clamping device for a locking hook, located on a horizontal worktable, characterized in that, Includes base plate (1), back plate (2), inclined positioning block (3), pressure plate (4), double-headed bolt (5), nut (6), first positioning shaft (7), and second positioning shaft (8); The top surface of the base plate (1) is vertically provided with horizontally distributed inclined positioning blocks (3) and horizontally distributed backing plates (2) respectively. The top of the inclined positioning block (3) is used to place the rough blank (200) of the lock hook to be processed. The upper left side of the backing plate (2) is connected to the rear end of a longitudinally distributed double-headed bolt (5); The top surface of the double-ended bolt (5) is used to contact the upper hook socket F inside the hook head (101) at the left end of the rough-machined blank (200) of the lock hook; A U-shaped opening (21) is longitudinally provided at the lower part of the pressure plate (4). The front end of the double-ended bolt (5) is threadedly connected to a nut (6) after passing through the U-shaped opening (21) of the pressure plate (4) forward. The hook (101) is located in the gap between the back plate (2) and the pressure plate (4); The back plate (2) and pressure plate (4) are used to clamp the hook head (101) at the left end of the rough-machined blank (200) of the lock hook by means of double-headed bolts (5) and nuts (6); On the right side of the top surface of the inclined positioning block (3), a positioning inclined surface (18) is provided. The positioning inclined surface (18) of the inclined positioning block (3) is in contact with the positioning straight surface B on the lower side of the middle part of the rough machined blank (200) of the locking hook; The left end of the oblique positioning block (3) has a vertical positioning block (16) protruding to the left. The vertical positioning block (16) extends to the left into the through groove C of the lower half of the hook head (101) at the left end of the rough-machined blank (200) of the locking hook; The first positioning shaft (7) is used to longitudinally penetrate into the two rough reference holes A′ when it is necessary to position the two rough reference holes A′ originally present on the front and rear sides of the hook head (101) at the left end of the rough machining blank (200) of the lock hook, and its right side is in close contact with the left end face of the vertical positioning block (16) at the left end of the inclined positioning block (3). The second positioning shaft (8) is used to longitudinally penetrate into the two precision reference holes A formed by machining the front and rear sides of the hook head (101) at the left end of the rough machining blank (200) of the lock hook when it is necessary to position the two precision reference holes A formed by machining the front and rear sides of the hook head (101) at the left end of the lock hook. Its right side is in close contact with the left end face of the vertical positioning block (16) at the left end of the inclined positioning block (3). Among them, the center point of the coarse datum hole A′ is the same as that of the fine datum hole A; The diameter of the fine datum hole A is larger than the diameter of the coarse datum hole A′; The angle between the positioning inclined surface (18) of the inclined positioning block (3) and the bottom reference surface M of the inclined positioning block (3) is α′; The included angle α′ is equal to the included angle α between the rough machining inclined surface E′ that needs to be machined on the rough machining blank (200) of the lock hook and the workpiece positioning straight surface B, and is also equal to the included angle α between the fine machining inclined surface E that needs to be machined on the finished lock hook (100) and the workpiece positioning straight surface B. The roughing inclined surface E′ is the bottom surface of the roughing inclined groove D′ that needs to be machined on the roughing blank (200) of the lock hook; The finishing inclined surface E is the bottom surface of the finishing inclined groove D that needs to be machined on the rough machining blank (200) of the lock hook; The roughing inclined surface E′ and the finishing inclined surface E are parallel to each other and have a preset interval distance β; Both the roughing inclined plane E′ and the finishing inclined plane E are parallel to the horizontal worktable; For the rough-machined inclined groove D′, its front and rear side walls are groove surfaces E2 and E1, respectively; For the precision-machined inclined groove D, its front and rear side walls are groove surfaces D2 and D1, respectively. The roughing inclined surface E′ and the finishing inclined surface E are parallel to each other, and there is a preset interval β between them; The E2 groove surface and the D2 groove surface are parallel to each other, and there is a preset interval β between them; The E1 groove surface and the D1 groove surface are parallel to each other, and there is a preset interval β between them; The vertical positioning block (16) and the lower half of the hook head (101) at the left end of the rough-machined blank (200) of the locking hook have a clearance fit; The thickness h of the vertical positioning block (16) is smaller than the width H of the through groove C of the lower half of the hook head (101) at the left end of the rough-machined blank (200) of the locking hook; The front and rear sides of the vertical positioning block (16) of the inclined positioning block (3) are respectively provided with hook head arc surface G receiving groove (17). The hook head arc surface G receiving groove (17) is used to receive the hook head arc surface G on the lower right end of the left side of the hook head (101) of the rough machined blank (200) of the lock hook.

2. The clamping device for the locking hook as described in claim 1, characterized in that, The pressure plate (4) is a circular open pad; The rear perimeter of the pressure plate (4) is provided with a rearward protruding annular boss (19). The front four sides of the pressure plate (4) are surrounded by annular chamfers (20). On the upper left side of the back plate (2), there is a longitudinal through double-headed bolt mounting hole (15). The double-ended bolt mounting hole (15) is located to the left of the inclined positioning block (3); The double-ended bolt mounting hole (15) is threaded to the rear end of the double-ended bolt (5).

3. The clamping device for the locking hook as described in claim 1, characterized in that, The U-shaped opening (21) on the pressure plate (4) and the double-headed bolt (5) are in clearance fit; The width of the U-shaped opening (21) on the pressure plate (4) is 1 mm larger than the shaft diameter of the double-ended bolt (5); The height of the positioning ramp (18) gradually decreases from left to right.

4. The clamping device for the locking hook as described in claim 1, characterized in that, The front and rear ends of the first positioning shaft (7) are the first positioning shaft handle (23) and the positioning straight shaft (22), respectively. Positioning shaft (22) is used for longitudinal insertion into two rough reference holes A′ on both sides of the hook head (101) at the left end of the rough-machined blank (200) of the lock hook; The positioning shaft (22) and the rough reference hole A′ are in clearance fit; The right side of the positioning straight shaft (22) is used to make tight contact with the left end face of the vertical positioning block (16) at the left end of the positioning block (3); The shaft diameter b of the positioning straight shaft (22) is smaller than the diameter of the coarse reference hole A′.

5. The clamping device for the locking hook as described in claim 4, characterized in that, The second positioning axis (8) includes a longitudinally distributed intermediate thin axis (24); The front and rear ends of the thin intermediate shaft (24) each have a thick shaft (25); The thick shaft (25) located on the front side is connected to the stepped shaft handle (26); The right side of the middle thin shaft (24) of the second positioning shaft (8) is used to make tight contact with the left end face of the vertical positioning block (16) at the left end of the positioning block (3).

6. The clamping device for the locking hook as described in claim 5, characterized in that, The shaft diameter b′ of the intermediate thin shaft (24) of the second positioning shaft (8) is the same as the shaft diameter b of the positioning straight shaft (22) of the first positioning shaft (7); The diameter c of the coarse shaft (25) is smaller than the diameter of the fine reference hole A and larger than the diameter of the intermediate fine shaft (24).

7. The clamping device for the lock hook as described in any one of claims 1 to 6, characterized in that, The base plate (1) and the back plate (2) are connected by multiple back plate mounting screws and two back plate mounting positioning pins; On the rear side of the top surface of the base plate (1), there are multiple mounting screw holes (9) that are distributed horizontally at equal intervals. On the top surface of the base plate (1), there is a mounting pin hole (10) on the left and right sides of the multiple mounting screw holes (9) of the base plate. At the bottom of the back plate (2), a back plate threaded hole (13) is provided at the position corresponding to each back plate mounting screw hole (9). At the bottom of the back plate (2), a back plate pin hole (14) is provided at a position corresponding to each back plate mounting pin hole (10). Each backplate mounting screw passes through a backplate mounting screw hole (9) and is threaded into a backplate threaded hole (13) corresponding to its position. The upper and lower ends of each mounting pin are connected to a mounting pin hole (14) and a mounting pin hole (10) respectively.

8. The clamping device for the lock hook as described in any one of claims 1 to 6, characterized in that, The base plate (1) is connected to the inclined positioning block (3) by an inclined positioning block mounting screw and an inclined positioning block positioning pin; The top center of the base plate (1) is provided with two inclined positioning block mounting screw holes (11) and two inclined positioning block mounting pin holes (12). At the bottom of the inclined positioning block (3), a threaded hole (301) is provided at a position corresponding to the mounting screw hole (11) of each inclined positioning block. At the bottom of the inclined positioning block (3), there is an inclined positioning block pin hole (302) at a position corresponding to each inclined positioning block mounting pin hole (12). Each inclined positioning block mounting screw passes through an inclined positioning block mounting screw hole (11) and is threadedly connected to an inclined positioning block threaded hole (301) corresponding to its position. The upper and lower ends of each inclined positioning block positioning pin are connected to an inclined positioning block pin hole (302) and an inclined positioning block mounting pin hole (12), respectively.

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