Adjustable positioning and pressing device for stepped workpieces

Abstract

The application discloses a kind of adjustable positioning and pressing device of step class workpiece, including bottom plate;The top surface of bottom plate middle part is provided with transverse distribution cushion block;The top of cushion block places step class workpiece;The top of bottom plate is provided with two positioning pins, and the rear side of step class workpiece middle part is closely contacted;The middle part of cushion block is provided with longitudinal distribution small pressing plate directly above;Small pressing plate front end bottom surface and step class workpiece middle part top surface are closely contacted;The top left end of cushion block is provided with transverse distribution large pressing plate directly above;Large pressing plate right end bottom surface and step class workpiece left end top are closely contacted;The left end of bottom plate top is provided with adjustable positioning block;Adjustable positioning block is provided with a push-pull block that can slide left and right;The right side of adjustable positioning block and the left side of step class workpiece are closely contacted;The top surface of push-pull block and the left end bottom of step class workpiece are closely contacted.The application can reliably position and press step class workpiece, ensure the stability of positioning and pressing, and guarantee the machining precision of workpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical processing, in particular to an adjustable positioning and pressing device for step type workpieces. BACKGROUND

[0002] For some step type workpieces, multiple end faces need to be processed. For example, referring to FIG. 1, a lock hook as a step type workpiece 100 is a part of an external locking device, and has an irregular hook shape, including a left end head 103 and a right end tail 104. The left end head is provided with an upper surface 101 and a lower surface 102 which are symmetrically arranged, and a left side end face is provided with a shorter longitudinal positioning surface A. A middle rear side is provided with a transverse positioning surface B, and a middle bottom is provided with a lower end positioning surface C. Figures la to Id It should be noted that the external locking device is an existing device for unlocking and locking a turnout through traction of an existing switch machine, and the lock hook is a key part of the traction movement.

[0003] The processing requirements for the lock hook are that all the end face parts on the outside except the longitudinal positioning surface A, the transverse positioning surface B and the lower end positioning surface C need to be processed.

[0004] It should be noted that all the end faces on the outside refer to the outer surface except the upper and lower planes of the step type workpiece (the upper plane includes the upper surface and the plane of the middle and tail of the workpiece, and the lower plane includes the lower end positioning surface C and the lower surface 102), and the longitudinal positioning surface A and the transverse positioning surface B. The outer end face refers to the side face.

[0005] Currently, when the lock hook as a step type workpiece 100 is processed, the lower end positioning surface C of the lock hook is used as a reference for positioning. At this time, in order to avoid over-positioning, the head lower surface 102 with a vertical distance H protruding from the lower end face needs to be suspended (H is the vertical distance between the lower end positioning surface C of the lock hook as the step type workpiece 100 and the lower surface 102. The H of each lock hook is affected by the processing precision, and there is an up-down deviation within the qualified range. If the lower end surface of the lock hook and the head lower surface 102 are positioned at the same time, over-positioning will inevitably occur). However, considering that the lock hook itself is relatively heavy (generally about 30 kg), and the center of gravity of the whole body is in the head, supporting and pressing only the lower end positioning surface C of the lock hook is not reliable enough. Because when the workpiece is processed, the workpiece is prone to shaking due to the cantilevered workpiece (i.e., the lower surface 102 is suspended), which affects the processing precision of the workpiece.

[0006]

[0007] ​Therefore, at present, it is urgent to develop a device which can position and press the multiple (i.e. more than one) non-machined positioning surfaces of the step workpiece such as the hook, ensure the stability of the positioning and pressing of the step workpiece (i.e. the stability of clamping), and effectively avoid the problem of shaking of the workpiece due to the cantilever (i.e. the lower surface is suspended) of the workpiece when machining the other end surface part (for example, an outer end surface part other than the longitudinal positioning surface A, the transverse positioning surface B and the lower end positioning surface C) of the workpiece except the positioning surface, so as to ensure the machining precision of the workpiece. SUMMARY

[0008] The purpose of the present application is to overcome the technical defects of the prior art, and provide an adjustable positioning and pressing device for step workpieces.

[0009] To this end, the present application provides an adjustable positioning and pressing device for step workpieces, comprising a horizontally distributed bottom plate;

[0010] The middle part of the top surface of the bottom plate is provided with a transversely distributed cushion block;

[0011] The top of the cushion block is used for placing a transversely distributed step workpiece;

[0012] The left end of the step workpiece is provided with an upper surface and a lower surface which are symmetrical, the left side surface is provided with a longitudinal positioning surface A, the middle rear side is provided with a transverse positioning surface B, and the middle bottom is provided with a lower end positioning surface C;

[0013] The lower end positioning surface C of the step workpiece is in contact with the top of the cushion block;

[0014] The top of the bottom plate is provided with a vertically distributed positioning pin at the position right behind the left and right ends of the cushion block, respectively;

[0015] The upper front side of the two positioning pins is in close contact with the transverse positioning surface B of the middle rear side of the step workpiece;

[0016] The middle part of the cushion block is provided with a longitudinally distributed small pressing plate above;

[0017] The rear end of the small pressing plate is provided with a vertically downward distributed pressing plate support rod;

[0018] The bottom surface of the pressing plate support rod is in close contact with the top surface of the bottom plate;

[0019] The middle part of the small pressing plate is fixedly connected with the bottom plate by a vertically distributed double-headed bolt;

[0020] The front end bottom surface of the small pressing plate is in close contact with the middle top surface of the step workpiece;

[0021] The top left end of the cushion block is provided with a transversely distributed large pressing plate above;

[0022] The left end of the large pressing plate is provided with a pressing stud vertically downwardly distributed in a threaded connection manner;

[0023] The bottom surface of the pressing stud is in close contact with the top surface of the bottom plate;

[0024] The bottom surface of the right end of the large pressing plate is in close contact with the upper platform of the left end of the stepped workpiece;

[0025] The left end of the top of the bottom plate is vertically provided with two columns symmetrically distributed in front and back;

[0026] The upper part of the two columns is connected by a longitudinally distributed pressing rod;

[0027] The bottom surface of the pressing rod is in close contact with the top surface of the middle part of the large pressing plate;

[0028] The left end of the top of the bottom plate is provided with an adjustable positioning block;

[0029] An adjustable positioning block is provided on the adjustable positioning block;

[0030] The right side of the adjustable positioning block is in close contact with the longitudinal positioning surface A of the left side of the stepped workpiece;

[0031] The top surface of the push-pull block is in close contact with the lower platform of the bottom of the left end of the stepped workpiece;

[0032] The right end of the top of the bottom plate is provided with a vertically distributed support column;

[0033] The top surface of the support column is in contact with the bottom surface of the right end of the stepped workpiece.

[0034] From the above technical scheme provided by the present application, compared with the prior art, the present application provides an adjustable positioning and pressing device for stepped workpieces, which has a scientific structure design and can position and press the positioning surface of the stepped workpiece (i.e. more than one) without machining, ensuring the stability of the positioning and pressing of the stepped workpiece (i.e. the stability of clamping), effectively avoiding the problem of workpiece vibration caused by the cantilever of the workpiece (i.e. the lower platform is suspended) when machining the other end surface part of the workpiece (e.g. a certain end surface part other than the longitudinal positioning surface A, the transverse positioning surface B and the lower end positioning surface C), ensuring the machining precision of the workpiece, and having great practical significance. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure la is a front view of a stepped workpiece (specifically a lock hook) to be machined;

[0036] Figure lbA rear view of an existing step type workpiece (specifically, a lock hook) to be processed;

[0037] Figure lc A top view of an existing step type workpiece (specifically, a lock hook) to be processed;

[0038] Figure Id A left view of an existing step type workpiece (specifically, a lock hook) to be processed;

[0039] Figure le A right view of an existing step type workpiece (specifically, a lock hook) to be processed;

[0040] Figure If A perspective structural schematic view of an existing step type workpiece (specifically, a lock hook) to be processed;

[0041] Figure 2a A front view (front view) of an adjustable positioning and pressing device for a step type workpiece provided by the present application, with a step type workpiece (for example, a lock hook) placed thereon;

[0042] Figure 2b A left view of an adjustable positioning and pressing device for a step type workpiece provided by the present application;

[0043] Figure 2c A top view of an adjustable positioning and pressing device for a step type workpiece provided by the present application, with a step type workpiece (for example, a lock hook) placed thereon;

[0044] Figure 3a A partial enlarged schematic view of an adjustable positioning and pressing device for a step type workpiece provided by the present application, with a step type workpiece (for example, a lock hook) placed thereon, before a large pressing plate is installed;

[0045] Figure 3b An assembly state schematic view of a large pressing plate and a pressing stud of an adjustable positioning and pressing device for a step type workpiece provided by the present application;

[0046] Figure 3c A partial enlarged schematic view of an adjustable positioning and pressing device for a step type workpiece provided by the present application, with a step type workpiece (for example, a lock hook) placed thereon, after a large pressing plate is installed;

[0047] Figure 4a A schematic view of a bottom plate in an adjustable positioning and pressing device for a step type workpiece provided by the present application, after being cut along a longitudinal middle position;

[0048] Figure 4b A top view of a bottom plate in an adjustable positioning and pressing device for a step type workpiece provided by the present application;

[0049] Figure 5a A schematic view of the adjustable positioning block of the adjustable positioning and pressing device for the stepped workpiece according to the present application, after being cut along the longitudinal middle position;

[0050] Figure 5b A top view of the adjustable positioning block of the adjustable positioning and pressing device for the stepped workpiece according to the present application, after being cut along the direction of the central axis of the adjusting screw mounting hole;

[0051] Figure 6a A schematic view of the push-pull block of the adjustable positioning and pressing device for the stepped workpiece according to the present application, after being cut along the longitudinal middle position;

[0052] Figure 6b A top view of the push-pull block of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0053] Figure 7a A front view of the adjusting screw of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0054] Figure 7b A left view of the adjusting screw of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0055] Figure 8a A front view of the stand of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0056] Figure 8b A top view of the stand of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0057] Figure 9a A front view of the pressing screw of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0058] Figure 9b A top view of the pressing screw of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0059] Figure 10a A front view of the large pressing plate of the adjustable positioning and pressing device for the stepped workpiece according to the present application, which is partially cut away;

[0060] Figure 10b A top view of the large pressing plate of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0061] Figure 11 A top view of the pressing rod of the adjustable positioning and pressing device for the stepped workpiece according to the present application;

[0062] Figure 12a A front view of a spacer in an adjustable positioning and pressing device for stepped workpieces according to the present application, partially sectioned;

[0063] Figure 12b A top view of a spacer in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0064] Figure 13a A top view of a small pressing plate in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0065] Figure 13b A longitudinal sectional view of a small pressing plate in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0066] Figure 14 A front view of a stud bolt in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0067] Figure 15 A front view of a positioning pin in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0068] Figure 16 A front view of a support column in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0069] Figure 17 A front view of a pressing plate support rod in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0070] Figure 18a A front view of a hexagonal nut in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0071] Figure 18b A top view of a hexagonal nut in an adjustable positioning and pressing device for stepped workpieces according to the present application;

[0072] In the figure, 1. base plate, 2. adjustable positioning block, 3. push-pull block, 4. adjustment screw, 5. stand column;

[0073] 6. pressing stud, 7. large pressing plate, 8. pressing rod, 9. spacer, 10. small pressing plate;

[0074] 11. stud bolt, 12. positioning pin, 13. support column, 14. pressing plate support rod, 15. hexagonal nut;

[0075] 16. positioning pin mounting hole, 17. spacer mounting counterbore, 18. stud bolt mounting hole, 19. support column mounting hole, 20. adjustable positioning mounting slot;

[0076] 21. adjustable positioning mounting hole, 22. column mounting hole, 23. end face rest plate, 24. end positioning face, 25. adjusting screw mounting hole;

[0077] 26. sliding slope, 27. adjustable positioning mounting hole, 28. lower end face, 29. push-pull block slope, 30. upper positioning face;

[0078] 31. adjusting screw mounting slot, 32. round table, 33. square column, 34. pressure rod mounting hole, 35. threaded portion;

[0079] 36. stud hole, 37. ball head face, 38. hexagonal head end, 39. pressure receiving face, 40. arc face;

[0080] 41. cushion block mounting threaded hole, 42. pressure plate support mounting hole, 43. oblong hole, 44. support column upper end face, 45. cushion block upper end face;

[0081] 46. right side limiting face, 47. clamping groove. DETAILED DESCRIPTION

[0082] The technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0083] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0084] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0085] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0086] Referring to Figures la to 18b , the present application provides an adjustable positioning and pressing device for step-shaped workpieces, comprising a horizontally distributed bottom plate 1;

[0087] The top surface of the bottom plate 1 is provided with transversely distributed cushion blocks 9;

[0088] The top of the cushion block 9 is used to place the transversely distributed step-shaped workpieces 100 Figure 2a The step-shaped workpiece shown can be Figure la The locking hook shown);

[0089] It should be noted that the left end of the step-shaped workpiece 100 is provided with an upper surface 101 and a lower surface 102 which are symmetrical, the left side surface is provided with a shorter longitudinal positioning surface A, the middle rear side is provided with a transverse positioning surface B, and the middle bottom is provided with a lower end positioning surface C.

[0090] The middle bottom surface of the step-shaped workpiece 100 (i.e. the lower end positioning surface C) is in contact with the top of the cushion block 9;

[0091] The top of the bottom plate 1 is provided with a vertically distributed positioning pin 12 at the position right behind the left and right ends of the cushion block 9;

[0092] The upper front side of the two positioning pins 12 is in close contact (i.e. top contact) with the transverse positioning surface B (i.e. middle rear side surface) of the middle rear side of the step-shaped workpiece 100;

[0093] The middle of the cushion block 9 is provided with a longitudinally distributed small pressing plate 10;

[0094] The rear end of the small pressing plate 10 is provided with a downward vertically distributed pressing plate support rod 14, referring to Figure 3b The bottom surface of the pressing plate support rod 14 is in top contact with the top surface of the bottom plate 1;

[0095] The bottom surface of the pressing plate support rod 14 is in top contact with the top surface of the bottom plate 1;

[0096] The middle part of the small pressing plate 10 is fixedly connected with the bottom plate 1 through a vertically distributed double-end bolt 11;

[0097] The front end bottom surface of the small pressing plate 10 is in close contact (i.e. top contact) with the middle top surface of the stepped workpiece 100;

[0098] The top left end of the cushion block 9 is provided with a laterally distributed large pressing plate 7;

[0099] The left end of the large pressing plate 7 is provided with a downward vertically distributed pressing stud 6 in a threaded connection manner;

[0100] The bottom surface of the pressing stud 6 is in top contact with the top surface of the bottom plate 1;

[0101] The right end bottom surface of the large pressing plate 7 is in close contact (i.e. top contact) with the upper surface 101 (i.e. left end top surface) of the left end top part of the stepped workpiece 100;

[0102] The top left end of the bottom plate 1 is vertically provided with two vertically distributed front and back symmetrical columns 5;

[0103] The upper parts of the two columns 5 are connected through a longitudinally distributed pressing rod 8;

[0104] The bottom surface of the pressing rod 8 is in close contact (i.e. top contact) with the middle top surface of the large pressing plate 7;

[0105] The top left end of the bottom plate 1 is provided with an adjustable positioning block 2;

[0106] The adjustable positioning block 2 is provided with a left and right slidable push-pull block 3;

[0107] The right side of the adjustable positioning block 2 is in close contact (i.e. top contact) with the longitudinal positioning surface A (i.e. left end surface) of the left side of the stepped workpiece 100;

[0108] The top surface of the push-pull block 3 is in close contact (i.e. top contact) with the lower surface 102 of the left end bottom part of the stepped workpiece 100.

[0109] In the present application, the two positioning pins 12 on the top of the bottom plate 1 are distributed in a left and right symmetrical manner.

[0110] In the present application, the top right end of the bottom plate 1 is provided with a vertically distributed support column 13;

[0111] The top surface of the support column 13 is in contact with the right end bottom surface of the stepped workpiece 100.

[0112] The top right end of the bottom plate 1 is provided with a support column mounting hole 19;

[0113] The lower end of the support column 13 is arranged in the support column mounting hole 19.

[0114] In the present application, the cushion block 9 is fixed on the top of the base 1 by two hexagonal socket head cap screws. Specifically, the left and right ends of the cushion block 9 are respectively provided with a vertical and upward-through cushion block mounting threaded hole 41.

[0115] The top of the base plate 1 is provided with a cushion block mounting counterbore 17 at a position corresponding to each of the cushion block mounting threaded holes 41 on the cushion block 9.

[0116] The upper and lower ends of each hexagonal socket head cap screw are respectively connected to the cushion block mounting threaded hole 41 on the cushion block 9 and the cushion block mounting counterbore 17 on the base plate 1.

[0117] In a specific implementation, the shape and size of the top surface of the cushion block 9 correspond to and match the shape and size of the bottom surface of the middle part of the stepped workpiece 100.

[0118] In a specific implementation, the shape and size of the top surface of the cushion block 9 are smaller than the shape and size of the bottom surface of the middle part of the stepped workpiece 100.

[0119] It should be noted that the cushion block 9 is used to position the lower end surface of the middle part of the stepped workpiece. The outer shape of the cushion block 9 is designed according to the outer shape of the middle part of the stepped workpiece 100, and the outer size is slightly smaller than the outer shape of the stepped workpiece 100 by 2 mm, considering the machining of the outer side surface (such as the front side surface) of the workpiece.

[0120] In the present application, in a specific implementation, for the present application, after assembly, as shown in Figure 2a , Figure 12a and Figure 16 , the height of the cushion block upper end surface 45 on the top of the cushion block 9 is the same as the height of the support column upper end surface 44 on the top of the support column 13, and the cushion block upper end surface 45 and the support column upper end surface 44 are located on the same horizontal plane (such as the M plane shown in Figure 2a ).

[0121] In the present application, in a specific implementation, the top left end of the base plate 1 is provided with a longitudinally-through (i.e., front-to-back-through) and top-open adjustable positioning mounting groove 20.

[0122] The adjustable positioning mounting groove 20 is located to the right of the two vertical columns 5.

[0123] An adjustable positioning block 2 is arranged on the adjustable positioning mounting groove 20.

[0124] In a specific implementation, as shown in Figure 4a , Figure 4b , the adjustable positioning block 2 is fixedly installed in the adjustable positioning mounting groove 20 by a hexagonal socket head cap screw.

[0125] Specific structure is: the left end middle part of adjustable positioning installation groove 20 is provided with adjustable positioning installation counterbore 21;

[0126] Referring to Figure 5a As shown in the figure, the left end lower part of adjustable positioning block 2 is provided with adjustable positioning installation hole 27 which is vertically distributed and has an open bottom;

[0127] The upper and lower ends of the hexagonal socket head cap screw are respectively connected with adjustable positioning installation hole 27 on adjustable positioning block 2 and adjustable positioning installation counterbore 21 on adjustable positioning installation groove 20.

[0128] Specifically, referring to Figure 5a And Figure 4b As shown in the figure, the transverse width b of adjustable positioning block 2 is greater than the groove width b' of adjustable positioning installation groove 20, and adjustable positioning block 2 is in interference fit with adjustable positioning installation groove 20 to ensure the positioning accuracy of adjustable positioning block 2.

[0129] In the application, specifically, the top of base plate 1 is provided with one positioning pin installation hole 16 respectively at the positions right behind the left and right ends of cushion block 9;

[0130] Each positioning pin installation hole 16 is respectively connected with the lower end of one positioning pin 12.

[0131] Specifically, referring to Figure 4b As shown in the figure, the center line of the two positioning pin installation holes 16 is perpendicular to adjustable positioning installation groove 20;

[0132] Specifically, adjustable positioning block 2 is in L shape;

[0133] Specifically, referring to Figure 5a And Figure 5b As shown in the figure, the left side of adjustable positioning block 2 is provided with vertical upward end face abutting plate 23;

[0134] The middle part and the right side top surface of adjustable positioning block 2 are sliding inclined surfaces 26;

[0135] The right side surface of end face abutting plate 23 is end positioning surface 24;

[0136] The lower end center position of end face abutting plate 23 is provided with adjustable positioning installation hole 27;

[0137] The bottom end of end positioning surface 24 on the right side of end face abutting plate 23 is connected with the left end of sliding inclined surface 26, and the upper side of end face abutting plate 23 at the connection position is provided with transversely left and right penetrating adjustment screw installation hole 25;

[0138] Referring to Figure 5b As shown in the figure, adjustment screw installation hole 25 is located at the longitudinal middle position of end face abutting plate 23.

[0139] Referring to Figs. 1 and 2 Figure 2a As shown in Fig. 1, a transversely distributed adjusting screw 4 is inserted into the adjusting screw mounting hole 25 from left to right.

[0140] In a specific implementation, an angle between the sliding slope 26 and the lower end surface 28 of the adjustable positioning block 2 is α.

[0141] In a specific implementation, as shown in Fig. 1, Figure 6a 、 Figure 6b As shown in Fig. 1, the push-pull block 3 is a wedge block.

[0142] The lower end surface of the push-pull block 3 is a push-pull block slope 29.

[0143] The upper end surface of the push-pull block 3 is a horizontally distributed upper positioning surface 30.

[0144] The push-pull block slope 29 is in close contact with the sliding slope 26 in the adjustable positioning block 2.

[0145] In a specific implementation, an angle between the push-pull block slope 29 and the upper positioning surface 30 is equal to an angle between the sliding slope 26 in the adjustable positioning block 2 and the lower end surface 28 of the adjustable positioning block 2, that is, the angle α.

[0146] It should be noted that, for the present application, the push-pull block 3 is placed on the sliding slope 26 at the top of the adjustable positioning block 2, the push-pull block slope 29 is in close contact with the sliding slope 26, at this time, the upper positioning surface 30 of the push-pull block 3 is parallel to the horizontal plane, and the upper positioning surface 30 of the push-pull block 3 is parallel to the horizontal plane when the push-pull block 3 is at any position on the sliding slope 26.

[0147] In a specific implementation, as shown in Fig. 1, Figure 2a 、 Figure 4a As shown in Fig. 1, the right side surface of the adjustable positioning mounting groove 20 is a right side limiting surface 46.

[0148] When the adjustable positioning block 2 is arranged in the adjustable positioning mounting groove 20, the height of the right side surface of the adjustable positioning block 2 is lower than the height of the right side limiting surface 46, and the height of the right end of the sliding slope 26 is lower than the height of the right side limiting surface 46.

[0149] In a specific implementation, when the push-pull block 3 slides to the right side limiting surface 46 of the adjustable positioning mounting groove 20, the vertical height of the upper surface 30 of the push-pull block 3 is lower than the height of the horizontal plane (that is, the M plane) on which the upper end surface 45 of the pad and the upper end surface 44 of the support column are located by at least H (the difference between the heights of the two is greater than H).

[0150] H is the vertical distance between the lower end positioning surface C of the step type workpiece 100 and the lower surface 102.

[0151] It should be noted that, for the present application, when the push-pull block 3 slides to the right side limiting surface 46 of the adjustable positioning installation groove 20, the vertical height of the upper surface 30 of the push-pull block 3 is slightly lower than the height of the horizontal surface (i.e. M surface) where the upper end surface 45 of the pad and the upper end surface 44 of the support column are located, that is, H+1mm.

[0152] In a specific implementation, the left end of the push-pull block 3 is provided with an adjustment screw installation groove 31 vertically penetrating up and down;

[0153] The left side of the adjustment screw installation groove 31 is open;

[0154] After the laterally distributed adjustment screws 4 laterally penetrate the adjustment screw installation holes 25 in the adjustable positioning block 2, they are embedded in the adjustment screw installation groove 31.

[0155] In a specific implementation, the adjustment screw installation groove 31 includes a left end portion and a right end portion that are in communication with each other;

[0156] The cross-sectional area of the left end portion of the adjustment screw installation groove 31 is smaller than the cross-sectional area of the right end portion;

[0157] The cross-sectional shape of the left end portion and the right end portion of the adjustment screw installation groove 31 are both rectangular.

[0158] In a specific implementation, the right end of the adjustment screw 4 has a limiting clamping table 401;

[0159] The limiting clamping table 401 is provided with a clamping groove 47 distributed around the left side of the limiting clamping table 401;

[0160] The clamping groove 47 on the adjustment screw 4 and the limiting clamping table 401 are located in the adjustment screw installation groove 31 of the push-pull block 3 and are in sliding fit.

[0161] It should be noted that, in a specific assembly, by placing the push-pull block 3 from top to bottom, the adjustment screw installation groove 31 of the push-pull block 3 can be sleeved outside the clamping groove 47 and the limiting clamping table 401 on the adjustment screw 4.

[0162] It should be noted that, for the present application, referring to Figures 2a to 2c When clamping the step type workpiece 100, by adjusting the laterally distributed adjustment screws 4, the push-pull block 3 slides laterally left and right on the sliding slope 26, and the upper positioning surface 30 at the top of the push-pull block 3 is displaced up and down on the sliding slope 26, and when the upper positioning surface 30 is adjusted to abut against the lower surface 102 of the lower part of the step type workpiece 100, the adjustment positioning of the lower surface of the step type workpiece is realized.

[0163] In the present application, in a specific implementation, the top of the bottom plate 1 is provided with a double-headed bolt installation hole 18;

[0164] The stud bolt mounting hole 18 is located at the rear position of the gap between the two positioning pins 12;

[0165] The lower end of the stud bolt 11 is connected with the stud bolt mounting hole 18 at the top of the bottom plate 1.

[0166] The upper end of the stud bolt 11 vertically penetrates through the long circular hole 43 distributed longitudinally on the small pressing plate 10 and is fixedly connected with a hexagonal nut 15 in a threaded manner.

[0167] In a specific implementation, the transverse width of the hexagonal nut 15 is greater than the transverse width of the long circular hole 43.

[0168] In the present application, in a specific implementation, the rear end of the small pressing plate 10 is provided with a pressing plate support mounting hole 42.

[0169] The pressing plate support mounting hole 42 is connected with the upper end of the pressing plate support rod 14.

[0170] The middle part of the small pressing plate 10 is provided with a long circular hole 43 extending from the middle part of the small pressing plate 10 to the front end and distributed longitudinally.

[0171] The upper end of the stud bolt 11 vertically penetrates through the long circular hole 43 and is fixedly connected with a hexagonal nut 15 in a threaded manner.

[0172] It should be noted that the front and rear positions of the small pressing plate 10 can be adjusted by adjusting the specific position of the stud bolt 11 in the long circular hole 43, so as to adjust the contact area size of the small pressing plate 10 and the top surface of the middle part of the stepped workpiece 100. In addition, the stud bolt 11 facilitates the disassembly of the stepped workpiece 100.

[0173] In the present application, in a specific implementation, referring to Figure 8a , Figure 8b The lower end of each column 5 has a circular table 32.

[0174] The circular tables 32 at the lower ends of the two columns 5 are arranged in the two column mounting holes 22 at the left end of the top of the bottom plate 1.

[0175] In a specific implementation, each column 5 includes a square column 33.

[0176] The bottom of the square column 33 is connected with the top surface of the circular table 32.

[0177] The front and rear sides of the square column 33 are transversely distributed vertical planes.

[0178] The sides of the two square columns 33 facing the side of the large pressing plate 7 are in contact with the side of the large pressing plate 7.

[0179] In a specific implementation, the four corner portions of the square column 33 respectively have a 45° chamfer (specifically a straight chamfer).

[0180] Specifically, the upper end of the square column 33 of each stand 5 is provided with a longitudinally distributed press rod mounting hole 34;

[0181] The front and rear ends of the press rod 8 are respectively mounted in the two press rod mounting holes 34.

[0182] Specifically, the end of the press rod 8 is interference-mounted in the press rod mounting hole 34, which can prevent the press rod 8 from being pulled out of the press rod mounting hole 34 during use.

[0183] In the present application, specifically, the left end of the large pressing plate 7 is provided with a threaded hole 36;

[0184] The threaded portion 35 on the upper part of the pressing stud 6 is threadedly connected with the threaded hole 36 at the left end of the large pressing plate 7.

[0185] The bottom surface of the pressing stud 6 is a spherical surface 37;

[0186] The spherical surface 37 is in close contact with the top surface of the bottom plate 1 (i.e., top contact).

[0187] Specifically, the middle top surface of the large pressing plate 7 is a pressure bearing surface 39 of the press rod 8;

[0188] The bottom surface of the press rod 8 is in close contact with the middle top surface of the large pressing plate 7 (i.e., top contact);

[0189] The right lower end surface of the large pressing plate 7 is an arc surface 40 protruding downward;

[0190] Referring to Figure 3c 、 Figure 10a The arc surface 40 of the large pressing plate 7 is in close contact with the upper surface 101 (i.e., the left end top surface) of the left end top of the stepped workpiece 100 (i.e., top contact).

[0191] Specifically, the top end of the pressing stud 6 is provided with a hexagonal head end 38;

[0192] It should be noted that the top end of the pressing stud 6 is a hexagonal head end 38 for facilitating the rotation of a wrench.

[0193] It should be noted that for the device of the present application, the press plate can be arranged to press the workpiece at three positions that do not need to be machined, i.e., the longitudinal positioning surface A, the transverse positioning surface B, and the lower end positioning surface C, based on the longitudinal positioning surface A and the transverse positioning surface B and the lower end positioning surface C, which ensures the stability of clamping the stepped workpiece, and effectively solves the problem of relatively short positioning and pressing surface of the stepped workpiece and the need for machining all end surfaces or a certain end surface outside the upper and lower surfaces and the positioning surface at one time, in cooperation with existing machine tools and other machining equipment.

[0194] It is to be noted that all the end faces outside the upper and lower planes and the positioning plane refer to the outer surface except the upper and lower planes of the stepped workpiece (the upper plane refers to the plane including the upper surface and the middle and tail portions of the workpiece, and the lower plane refers to the lower end positioning plane C and the lower surface 102) and the longitudinal positioning plane A, the transverse positioning plane B, and the side surface.

[0195] It is to be noted that in the present application, the adjustable positioning block 2 is shrink-fitted in the adjustable positioning mounting groove, can realize the positioning of the end side surface of the stepped workpiece, and through the combination with the push-pull block 3 provided with the same angle inclined surface, the left-right adjustment movement of the push-pull block 3 can be converted into the adjustment of the up-down floating positioning through the adjustment of the adjusting screw 4. During the adjustment, the adjusting screw 4 moves to the left and rotates, so that the push-pull block 3 moves to the upper left, and the push-pull block 3 has a left friction force on the workpiece, so that the end side surface (i.e. the longitudinal positioning plane A) of the workpiece is further closely attached to the end side positioning surface (i.e. the end positioning plane 24) of the adjustable positioning block 2.

[0196] The two support columns 13 are installed on the bottom plate 1 and surround the pressing rod 8 to form a square frame structure. The large pressing plate 7 passes through below the pressing rod 8. The left end of the large pressing plate 7 is installed with the pressing stud 6. The right end of the large pressing plate 7 abuts against the workpiece. Through the rotation of the pressing stud 6, the middle portion of the large pressing plate 7 can abut against the pressing rod 8, so as to realize the downward pressing of the right end of the large pressing plate 7 on the stepped workpiece.

[0197] The small pressing plate 10 passes through the double-headed bolt 11. The rear end of the small pressing plate 10 abuts against the top surface of the bottom plate 1 through the pressing plate support rod 14. The hexagonal nut 15 at the end of the double-headed bolt 11 is rotated, so that the front end bottom surface of the small pressing plate 10 abuts against the top portion of the stepped workpiece, thereby pressing the stepped workpiece.

[0198] The cushion block 9 and the support column 13 simultaneously serve as the main positioning of the lower end surface of the stepped workpiece, and have the same height. In view of the irregularity of the workpiece, the two split main positionings are provided.

[0199] The right side limiting surface 46 of the adjustable positioning mounting groove 20 is the rightmost limit position of the push-pull block 3 in the adjustable positioning mounting groove 20, i.e. the lowest position of the upper end surface of the push-pull block 3. At this position, the stepped workpiece abuts against the cushion block 9 and the support column 13. There is a gap between the upper end surface of the push-pull block 3 and the stepped workpiece. At this time, the adjusting screw 4 is rotated to the left, so that the upper end surface of the push-pull block 3 moves to the upper left, thereby making the upper end surface of the push-pull block 3 abut against the lower surface 102 of the stepped workpiece, thereby realizing the adjustment positioning.

[0200] In order to more clearly understand the technical scheme of the present application, the operation principle of the present application is described below.

[0201] Firstly, referring to Figures 2a to 2cAs shown, the device of the present application is placed on the workbench, the adjusting screw 4 is adjusted rightward in the transverse direction, and the push-pull block 3 is slid to the limiting surface 46 on the right side of the adjustable positioning mounting groove 20.

[0202] Then, referring to Figures 2a to 2c As shown, the stepped workpiece 100 to be processed is placed on the device of the present application, and the lower end positioning surface C of the stepped workpiece 100 abuts against the upper end surface 45 of the pad 9 and the upper end surface 44 of the support column 13.

[0203] Then, the stepped workpiece 100 is moved in the transverse direction, the transverse positioning surface B on the rear side of the middle part of the stepped workpiece 100 abuts against the two positioning pins 12 on the bottom plate 1, and the longitudinal positioning surface A on the left side of the stepped workpiece 100 abuts against the end positioning surface 24 on the right side of the end surface abutting plate 23, at this time, the positioning of the workpiece is completed.

[0204] Then, the position of the small pressing plate 10 is adjusted, and the hexagonal nut 15 sleeved on the end of the double-headed bolt 11 is tightened, so that the front end bottom of the small pressing plate 10 presses the top surface of the middle part of the stepped workpiece 100.

[0205] Then, the adjusting screw 4 is adjusted leftward, so that the upper surface 30 of the push-pull block 3 abuts against the lower surface 102 of the lower part of the stepped workpiece 100.

[0206] Then, the combination of the pressing stud 6 and the large pressing plate 7 is passed through the lower end of the pressing rod 8 connected to the top of the two columns 5, so that the arc surface 40 of the large pressing plate 7 abuts against the position corresponding to the upper surface 101 of the stepped workpiece 100, the pressing stud 6 is rotated, so that the pressure bearing surface 39 on the top of the large pressing plate 7 abuts against the pressing rod 8, at this time, the clamping and positioning of the stepped workpiece 100 is completed, and the existing machine tool is started, so that the machining of the one or more outer side surfaces of the workpiece is completed.

[0207] It should be noted that the existing machining center machine tool is started, so that the machining of the circumferential side surface of the stepped workpiece is completed.

[0208] Compared with the prior art, the adjustable positioning and pressing device for the stepped workpiece provided by the present application has the following beneficial effects:

[0209] 1. The adjustable auxiliary positioning structure for the workpiece designed in the present application effectively avoids the problem of workpiece vibration caused by the cantilever (i.e. suspension) of the workpiece during machining, and avoids affecting the machining precision.

[0210] It should be noted that for the step type workpiece, if the step positioning structure is designed as the workpiece, due to the machining tolerance of the workpiece, the height difference of the steps of different workpieces is different during use, therefore, the two step surfaces on the upper and lower sides of the step type workpiece cannot be in full contact with the step positioning structure at the same time, that is, over positioning will be caused; the device of the application can adjust the up and down positions of the auxiliary positioning (that is, adjust the up and down position of the push-pull block 3 on the adjustable positioning block 2) on the basis that the main positioning structure (including the cushion block 9, the supporting column 13, the large pressing plate 7 and the small pressing plate 10, etc.) has positioned the workpiece against the related positioning surface, so that the auxiliary positioning surface (that is, the upper end surface of the push-pull block 3) is in abutment with the step surface (that is, the lower surface 102) of the workpiece, thereby realizing the positioning of the two step surfaces of the workpiece without over positioning.

[0211] In the application, it should be noted that for the step type workpiece to be machined, the longitudinal positioning surface is short, and the adjustable positioning and pressing need to be provided on the same side at the same time. The general pressing structure needs to be fixedly connected with the large pressing plate through a vertically distributed supporting column, and the position of the supporting column conflicts with the adjusting screw of the adjustable positioning block. The quick disassembly and assembly type pressing structure (that is, the combined structure of the pressing stud 6 and the large pressing plate 7) provided by the device can quickly install and press the upper step of the workpiece after the adjustment positioning is completed, so as to not conflict with the adjustable positioning structure (that is, the adjustable positioning block 2 and the push-pull block 3).

[0212] In the application, it should be noted that for the cooperation structure of the adjustable positioning block 2 and the push-pull block 3, the adjustable positioning block 2 can not only realize the positioning of the longitudinal positioning surface A of the workpiece, but also realize the adjustment positioning of the lower step surface of the step type workpiece by adjusting the adjusting screw 4 (the inclined surface structure of the adjustable positioning block and the push-pull block can realize vertical lifting, and during adjustment, the upper end surface of the push-pull block can be in abutment with the lower step surface 102 of the workpiece to realize positioning.

[0213] In the application, it should be noted that the front side (that is, the front side end surface) of the step type workpiece is one of the objects to be machined by the existing machining center machine tool, that is, a part to be machined.

[0214] 2, the application adopts the structure combined with the stand, the pressing rod, the pressing stud and the large pressing plate, which is convenient to disassemble, and presses the same side position of the workpiece positioning surface (specifically the upper step of the left end top of the step type workpiece 100), and simultaneously solves the problems of positioning and pressing.

[0215] 3、The application can reliably position and clamp the step workpiece, effectively solve the problem that the positioning and pressing surface of the step workpiece is relatively short and all the end surfaces except the positioning surface need to be machined at one time, greatly improve the work efficiency, and the operation is convenient and fast, effectively guarantee the machining precision of the workpiece.

[0216] In summary, compared with the prior art, the adjustable positioning and pressing device for the step workpiece provided by the application has a scientific structure design, can position and press the multiple (i.e. more than one) positioning surfaces on the step workpiece such as the lock hook without machining, ensure the stability of the positioning and pressing of the step workpiece (i.e. the stability of the clamping), effectively avoid the problem of shaking of the workpiece due to the cantilever (i.e. the lower surface is suspended) of the workpiece when machining the other end surface part (for example, a certain end surface part except the longitudinal positioning surface A, the transverse positioning surface B and the lower end positioning surface C) of the workpiece except the positioning surface, guarantee the machining precision of the workpiece, and have great practical significance.

[0217] The above is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements should also be considered within the protection scope of the application.

Claims

1. A step workpiece adjustable positioning and pressing device, characterized in that, The bottom plate (1) is horizontally distributed; The top surface of the bottom plate (1) is provided with transversely distributed pads (9) in the middle part; The top of the pad (9) is used for placing transversely distributed step-like workpieces (100); The left end of the step-like workpiece (100) is provided with an upper platform (101) and a lower platform (102) which are symmetrical in up and down directions, a longitudinal positioning surface A is arranged on the left side end surface, a transverse positioning surface B is arranged on the middle part rear side, and a lower end positioning surface C is arranged on the middle bottom part; The lower end positioning surface C of the step-like workpiece (100) is in contact with the top of the pad (9); The top of the bottom plate (1) is provided with a vertically distributed positioning pin (12) at the right and left ends of the pad (9) and behind the pad (9); The upper front side of the two positioning pins (12) is in close contact with the transverse positioning surface B on the middle part rear side of the step-like workpiece (100); The middle part of the pad (9) is provided with a longitudinally distributed small pressing plate (10) above the pad (9); The rear end of the small pressing plate (10) is provided with a vertically downward distributed pressing plate support rod (14); The bottom surface of the pressing plate support rod (14) is in close contact with the top surface of the bottom plate (1); The middle part of the small pressing plate (10) is fixedly connected with the bottom plate (1) through a vertically distributed double-headed bolt (11); The front end bottom surface of the small pressing plate (10) is in close contact with the middle top surface of the step-like workpiece (100); The top left end of the pad (9) is provided with a transversely distributed large pressing plate (7); The left end of the large pressing plate (7) is provided with a vertically downward distributed pressing stud (6) through a threaded connection; The bottom surface of the pressing stud (6) is in close contact with the top surface of the bottom plate (1); The right end bottom surface of the large pressing plate (7) is in close contact with the upper platform (101) on the left end top of the step-like workpiece (100); The top left end of the bottom plate (1) is vertically provided with two front and back symmetrically distributed columns (5); The upper parts of the two columns (5) are connected through a longitudinally distributed pressing rod (8); The bottom surface of the pressing rod (8) is in close contact with the middle top surface of the large pressing plate (7); The top left end of the bottom plate (1) is provided with an adjustable positioning block (2); An adjustable positioning block (2) is provided on the top left end of the bottom plate (1); The right side of the adjustable positioning block (2) is in close contact with the longitudinal positioning surface A on the left side of the step-like workpiece (100); The top surface of the push-pull block (3) is in close contact with the lower platform (102) on the left end bottom of the step-like workpiece (100); The top right end of the bottom plate (1) is provided with a vertically distributed support column (13); The top surface of the support column (13) is in contact with the right end bottom surface of the step-like workpiece (100); The height of the pad upper end surface (45) on the top of the pad (9) is the same as the height of the support column upper end surface (44) on the top of the support column (13), and the pad upper end surface (45) and the support column upper end surface (44) are located on the same horizontal plane; The top left end of the bottom plate (1) is provided with an adjustable positioning installation groove (20) which is longitudinally through and has an opening on the top; The adjustable positioning installation groove (20) is located on the right side of the two columns (5); The adjustable positioning block (2) is arranged on the adjustable positioning installation groove (20); The adjustable positioning block (2) is fixedly arranged in the adjustable positioning installation groove (20) through the inner hexagonal screw; The adjustable positioning installation counterbore (21) is arranged at the middle of the left end of the adjustable positioning installation groove (20); The adjustable positioning installation hole (27) which is vertically distributed and has an open bottom is arranged at the lower left end of the adjustable positioning block (2); The upper and lower ends of the inner hexagonal screw are respectively connected with the adjustable positioning installation hole (27) on the adjustable positioning block (2) and the adjustable positioning installation counterbore (21) on the adjustable positioning installation groove (20).

2. The adjustable positioning and pressing device for stepped workpieces according to claim 1, characterized in that, The two positioning pins (12) on the top of the bottom plate (1) are symmetrically distributed left and right; The top surface of the cushion block (9) is smaller than the middle bottom surface of the stepped workpiece (100); The cushion block (9) is fixedly arranged on the top of the bottom plate (1) through the two inner hexagonal screws; The left and right ends of the cushion block (9) are respectively provided with a vertically and upwardly penetrating cushion block installation threaded hole (41); The top of the bottom plate (1) is respectively provided with a cushion block installation counterbore (17) at a position corresponding to each cushion block installation threaded hole (41) on the cushion block (9); The upper and lower ends of each inner hexagonal screw are respectively connected with the cushion block installation threaded hole (41) on the cushion block (9) and the cushion block installation counterbore (17) on the bottom plate (1).

3. The adjustable positioning and pressing device for stepped workpieces according to claim 1, characterized in that, The left side of the adjustable positioning block (2) is provided with an end face abutting plate (23) vertically upward; The middle and right top surface of the adjustable positioning block (2) is a sliding inclined surface (26); The right surface of the end face abutting plate (23) is an end positioning surface (24); The lower end center of the end face abutting plate (23) is provided with an adjustable positioning installation hole (27); The bottom end of the end positioning surface (24) on the right side of the end face abutting plate (23) is connected with the left end of the sliding inclined surface (26), and the end face abutting plate (23) is provided with a transversely and left-right penetrating adjustment screw installation hole (25) above the connection position; The adjustment screw installation hole (25) is located at the longitudinal middle position of the end face abutting plate (23); An adjustment screw (4) is transversely inserted into the adjustment screw installation hole (25) from left to right.

4. The adjustable positioning and pressing device for stepped workpieces according to claim 3, characterized in that The included angle between the sliding inclined surface (26) and the lower end surface (28) of the adjustable positioning block (2) is α; The push-pull block (3) is a wedge block; The lower end surface of the push-pull block (3) is a push-pull block inclined surface (29); The upper end surface of the push-pull block (3) is a horizontally distributed upper positioning surface (30); The push-pull block inclined surface (29) is in close contact with the sliding inclined surface (26) in the adjustable positioning block (2); The included angle between the push-pull block inclined surface (29) and the upper positioning surface (30) is equal to the included angle α between the sliding inclined surface (26) in the adjustable positioning block (2) and the lower end surface (28) of the adjustable positioning block (2); The right side surface of the adjustable positioning installation groove (20) is a right side limiting surface (46); When the adjustable positioning block (2) is arranged in the adjustable positioning installation groove (20), the height of the right side surface of the adjustable positioning block (2) is lower than that of the right side limiting surface (46), and the height of the right end of the sliding inclined surface (26) is lower than that of the right side limiting surface (46); When the push-pull block (3) slides to the right side limiting surface (46) of the adjustable positioning installation groove (20), the vertical height of the upper plane (30) of the push-pull block (3) is lower than the horizontal plane height of the upper end surface (45) of the cushion block and the upper end surface (44) of the support column by at least H height.

5. The adjustable positioning and pressing device for stepped workpieces according to claim 4, characterized in that, The left end of the push-pull block (3) is provided with an adjustment screw installation groove (31) vertically penetrating up and down; The left side opening of the adjustment screw installation groove (31); After the laterally distributed adjustment screw (4) laterally penetrates the adjustment screw installation hole (25) in the adjustable positioning block (2), it is embedded into the adjustment screw installation groove (31); The right end of the adjustment screw (4) has a limiting clamping table (401); The adjustment screw (4) is provided with a clamping groove (47) surrounding distribution on the left side of the limiting clamping table (401); The clamping groove (47) and the limiting clamping table (401) on the adjustment screw (4) are located in the adjustment screw installation groove (31) of the push-pull block (3) and are slidingly fitted; The adjustment screw installation groove (31) includes a left end part and a right end part which are in communication with each other; The cross-sectional area of the left end part of the adjustment screw installation groove (31) is smaller than the cross-sectional area of the right end part; The cross-sectional shape of the left end part and the right end part of the adjustment screw installation groove (31) is rectangular.

6. The adjustable positioning and pressing device for stepped workpieces according to claim 1, characterized in that, The top of the bottom plate (1) is provided with one positioning pin installation hole (16) respectively at the positions right behind the left and right ends of the cushion block (9); Each positioning pin installation hole (16) is connected with the lower end of one positioning pin (12) respectively; The center line connecting the two positioning pin installation holes (16) is perpendicular to the adjustable positioning installation groove (20); The top of the bottom plate (1) is provided with one double-headed bolt installation hole (18); The double-headed bolt installation hole (18) is located at the position behind the gap between the two positioning pins (12); The lower end of the double-headed bolt (11) is connected with the double-headed bolt installation hole (18) on the top of the bottom plate (1); The upper end of the double-headed bolt (11) penetrates vertically through the long circular hole (43) longitudinally distributed on the small pressure plate (10) and is threadedly fixedly connected with a hexagonal nut (15); The lower end of each column (5) has a circular table (32); The circular tables (32) at the lower ends of the two columns (5) are correspondingly arranged in the two column installation holes (22) at the left end of the top of the bottom plate (1); Each column (5) includes a square column (33); The bottom of the square column (33) is connected with the top surface of the circular table (32); The front and rear sides of the square column (33) are transversely distributed vertical planes; The sides of the two square columns (33) towards the side of the large pressure plate (7) are in contact with the side of the large pressure plate (7); The upper end of the square column (33) of each column (5) is respectively provided with a longitudinally distributed pressure rod installation hole (34); The front and rear ends of the pressure rod (8) are respectively installed in the two pressure rod installation holes (34).

7. The adjustable positioning and pressing device for stepped workpieces according to any one of claims 1 to 6, characterized in that The rear end of the small pressure plate (10) is provided with a pressure plate support installation hole (42); The pressure plate support installation hole (42) is connected with the upper end of the pressure plate support rod (14); The middle part of the small pressure plate (10) is provided with a longitudinally distributed long circular hole (43) extending from the middle part of the small pressure plate (10) to the front end; The upper end of the stud bolt (11) vertically penetrates through the long round hole (43) and is threadedly fixedly connected with a hexagonal nut (15).

8. The adjustable positioning and pressing device for stepped workpieces according to any one of claims 1 to 6, characterized in that The left end of the large pressing plate (7) is provided with a stud hole (36); The threaded portion (35) on the upper part of the pressing stud (6) is threadedly connected with the stud hole (36) on the left end of the large pressing plate (7); The bottom surface of the pressing stud (6) is a spherical head surface (37); The spherical head surface (37) is in close contact with the top surface of the bottom plate (1); The middle top surface of the large pressing plate (7) is a pressure bearing surface (39) of the pressing rod (8); The bottom surface of the pressing rod (8) is in close contact with the middle top surface of the large pressing plate (7); The right lower end surface of the large pressing plate (7) is a downward protruding arc surface (40); The arc surface (40) of the large pressing plate (7) is in close contact with the upper platform (101) on the top of the left end of the stepped workpiece (100).

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