CN111229955B

CN111229955B - Riveting device for inner plate of lever block wrench and brake cover

Info

Publication number: CN111229955B
Application number: CN201911426824.4A
Authority: CN
Inventors: 陈树忠; 黎士存; 张哲兴
Original assignee: Hebei Chenghua Machinery Manufacturing Co ltd
Current assignee: Hebei Chenghua Machinery Manufacturing Co ltd
Priority date: 2019-12-28
Filing date: 2019-12-28
Publication date: 2021-11-12
Anticipated expiration: 2039-12-28
Also published as: CN111229955A

Abstract

The invention discloses a riveting device for an inner plate of a wrench of a lever hoist and a brake cover, belonging to the technical field of lever hoists. The core die comprises a core die seat, a lower die plate, an upper die plate and an upper die body, wherein the core die seat is fixed up and down, the upper die plate and the upper die body are fixed up and down, the center of the core die seat is provided with a lower height-limiting part, the periphery of the core die seat is provided with a supporting part, a containing groove is arranged between the core die seat and the supporting part, and the bottom of the containing groove is provided with a double-step through hole with an upper step hole and a lower step hole; a positioning ring is arranged in the containing groove, a pressure spring is arranged in the upper stepped hole, the positioning ring is supported on the pressure spring, and a connecting bolt extends into the upper stepped hole from the lower stepped hole and penetrates through the pressure spring to be in threaded connection with the positioning ring; the upper die body is provided with a body part, a necking part and an upper die head, and the body part and the necking part are transited to form a limiting groove; the inner diameter and the outer diameter of the positioning ring are respectively matched with the diameter of the upper die head and the diameter of the necking part. After the limiting groove, the height limiting part and the locating ring are arranged respectively, the press riveting stroke of the upper die head is controllable, the flanging height of the inner wrench plate is controllable, and the diameter is not reduced, so that the inner wrench plate is flexibly and smoothly rotated after being riveted to the brake cover.

Description

Riveting device for inner plate of lever block wrench and brake cover

[ technical field ] A method for producing a semiconductor device

The invention relates to a riveting device for an inner plate of a wrench of a lever block and a brake cover, belonging to the technical field of lever blocks.

[ background of the invention ]

In the prior art practice, the inner wrench plate needs to be connected to the formed brake cover in a press riveting mode, a plurality of technical defects exist in the forming process that the folded edge of the inner wrench plate is bent into the folded edge, and the problems that the shrinkage of the reversing ratchet seat hole of the inner wrench plate cannot be overcome and the press riveting is too loose and too tight to be controlled are mainly shown. The smooth rotation of the reversing ratchet wheel accommodated in the reversing ratchet wheel seat hole is influenced after the diameter of the reversing ratchet wheel seat hole is reduced, the inner wrench plate is shaken too much due to the fact that the pressing riveting is loose, the wrenching operation efficiency of the inner wrench plate is influenced, and the inner wrench plate and the brake cover are damaged and even scrapped due to the fact that the pressing riveting is tight.

[ summary of the invention ]

The invention aims to provide a riveting device for an inner plate of a lever hoist wrench and a brake cover, so as to overcome the defects of the prior art.

Therefore, the invention adopts the following technical scheme:

the riveting device for the inner plate of the lever hoist wrench and the brake cover comprises a lower template, a mandrel holder fixed on the lower template, an upper template fixed on the upper template, and a lower height-limiting part arranged at the center of the mandrel holder, wherein a higher supporting part for placing the inner plate of the wrench is arranged at the periphery of the mandrel holder; the double-step through hole is provided with a pressure spring and a connecting bolt in a sliding manner, a positioning ring is arranged in the accommodating groove, the pressure spring is arranged in an upper step hole of the double-step through hole, the positioning ring is supported on the pressure spring, an exposed section of the positioning ring, which is exposed out of the core mold seat, is sleeved with a reversing ratchet seat hole of the wrench inner plate, and the connecting bolt extends into the upper step hole from a lower step hole of the double-step through hole and is in threaded connection with the positioning ring after penetrating through the pressure spring; the upper die body is provided with a body part, a necking part and an upper die head, wherein the necking part extends along the body part in sequence in the axial direction; the upper die head is vertically aligned with the height limiting part, the diameter of the upper die head is matched with the inner diameter of the positioning ring, the necking part corresponds to the upper and lower intervals of the positioning ring, and the diameter of the necking part is equal to the outer diameter of the positioning ring.

The limiting groove is provided with a groove top wall and a groove bottom wall, and the groove top wall and the groove bottom wall jointly form a horizontal semi-U shape.

After the structure is adopted, the bending part (flanging) of the inner plate of the wrench can be pressed and riveted on the brake cover more smoothly and snugly.

The lower template is at least uniformly provided with three guide holes, the number of the double-step through holes is equal to that of the guide holes, each double-step through hole is communicated with the corresponding guide hole, and the hole center of each double-step through hole is aligned with the hole center of the corresponding guide hole.

After the lower template is additionally provided with the guide hole, the connecting bolt head is guided to enter the guide hole in the press riveting process, so that the guide sliding precision is increased.

Compared with the prior art, the invention has the following beneficial effects:

the supporting part and the positioning ring of the core die holder are respectively used for the inner plate of the wrench to be placed and sleeved reliably; the upper die body is provided with the limiting groove, the press-riveting stroke of the upper die head is controllable after the height limiting part is additionally arranged on the core die seat, and the two die bodies are matched and designed to meet the requirements of effective press-riveting forming of the wrench inner plate and controllable height precision of a bent flanging, so that the wrench inner plate is ensured to rotate flexibly and smoothly after being riveted to the brake cover, the wrench inner plate cannot shake excessively due to too loose riveting to influence the wrenching work efficiency, and the situation that the wrench inner plate is jammed even causes scrapping due to too tight riveting can be avoided; the core die seat is provided with the positioning ring, the diameter of the upper die head is matched with the inner diameter of the positioning ring, and the diameter of the necking part is equal to the outer diameter of the positioning ring, so that the situation that the reversing ratchet seat hole of the inner plate of the wrench is not shrunk all the time in the whole pressing and riveting process can be avoided, the aperture size precision is guaranteed powerfully, the flexible and smooth rotation performance of the inner plate of the wrench can be guaranteed, the phenomenon that the inner plate of the wrench is shaken too much due to the fact that the inner plate of the wrench is loose due to riveting is avoided, the wrenching work efficiency is influenced, and the smooth rotation performance after the reversing ratchet wheel is installed on the inner plate of the wrench in the subsequent process is guaranteed.

[ description of the drawings ]

FIG. 1 is a schematic structural view of the wrench inner plate and the brake cover according to the present invention (before the wrench inner plate is pressed and riveted);

FIG. 2 is a schematic view of the wrench inner panel after being riveted and formed according to the present invention;

fig. 3 is a schematic view of a core mold base of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a schematic view of the inner wrench plate riveted to the brake housing;

fig. 6 is a right side view of fig. 5.

[ detailed description ] embodiments

Referring to fig. 1, 2, 3, 4, 5, and 6, the riveting apparatus for an inner plate of a wrench and a brake cover of a lever hoist comprises a lower die plate 1, a core die holder 2 fixed on the lower die plate 1, an upper die body 3 arranged above the core die holder 2 at an interval, and an upper die plate 4 fixed on the upper die body 3, wherein the core die holder 2 has a lower height limiting portion 21 at the center thereof and a higher supporting portion 22 at the periphery thereof for placing the wrench inner plate 8, a receiving groove 2A is provided between the height limiting portion 21 and the supporting portion 22, and a double-step through hole 20 is axially formed at the bottom of the receiving groove 2A along the core die holder 2; the double-step through hole 20 is provided with a pressure spring 5 and a connecting bolt 7 in a sliding manner, a positioning ring 6 is arranged in the accommodating groove 2A, wherein the pressure spring 5 is arranged in an upper step hole 201 of the double-step through hole 20, the positioning ring 6 is supported on the pressure spring 5 (namely, the positioning ring 6 is arranged in the accommodating groove 2A in a floating manner through the pressure spring 5), an exposed section of the positioning ring 6 exposed out of the core mold base 2 is sleeved with a reversing ratchet seat hole 80 of the wrench inner plate 8, the peripheral wall of the exposed section is matched with the reversing ratchet seat hole 80 of the wrench inner plate, the connecting bolt 7 extends into the upper step hole 201 from a lower step hole 202 of the double-step through hole 20, and the connecting bolt 7 penetrates through the pressure spring 5 and then is in threaded connection with the positioning ring 6; the upper die body 3 is provided with a body part 33 for fixedly connecting the upper die plate 4, a necking part 32 and an upper die head 31, wherein the necking part 32 extends along the body part 33 in sequence and axially, and the body part 33 and the necking part 32 are transited to form a limiting groove 30; the upper die head 31 is vertically aligned with the height limiting part 21, the diameter of the upper die head 31 is matched with the inner diameter of the positioning ring 6, the necking part 32 corresponds to the positioning ring 6 at an upper and lower interval, and the diameter of the necking part 32 is equal to the outer diameter of the positioning ring 6.

The top surface of the support portion 22 on which the inner wall of the body portion 8a of the spanner inner plate 8 rests is higher than the top surface of the height-limiting portion 21; the containing groove 2A is communicated with the double-step through hole 20 up and down; the compression spring 5 is installed to have a length such that an upper end thereof is exposed from the upper stepped hole 201 and is located in the accommodating groove 2A.

The upper die body is in a cylindrical step shape, and the positioning ring is in a circular ring shape.

At least three double-step through holes 20 are uniformly formed, and four double-step through holes are formed in a centrosymmetric manner in the embodiment; four pressure springs 5 are provided; there are four connecting bolts 7.

The limiting groove 30 is provided with a groove top wall 302 and a groove bottom wall 301, and the groove top wall 302 and the groove bottom wall 301 jointly form a horizontal half U shape.

The lower template 1 is at least uniformly provided with three guide holes 10, the number of the double-step through holes 20 is equal to that of the guide holes 10, each double-step through hole 20 is communicated with the corresponding guide hole 10, and the hole center of each double-step through hole 20 is aligned with the hole center of the corresponding guide hole 10.

The brake cover 9 is provided with a step hole 90, a small port of the step hole 90 is provided with a hole edge flanging part 91, and a reinforcing gasket K is pressed in an annular groove (not marked) of the hole edge flanging part 91; before the wrench inner plate 8 is riveted, the brake cover 9 is machined in advance, and the brake cover 9 is fixedly arranged on a driving side wall plate of the wrench hoist.

The inner wrench plate 8 is provided with a reversing ratchet seat hole 80, the orifice of the reversing ratchet seat hole 80 is provided with a folding edge 81, the purpose of press riveting is to bend the folding edge to form a folding edge 82, and the folding edge 82 is press riveted on the step of the step hole 90 of the brake cover 9.

The specific riveting process is as follows:

the invention is first mounted on a known press, wherein the lower die plate 1 is laid flat and fixed on the table of the press. Next, as shown in fig. 1, the inner wrench plate 8 is fitted to the positioning ring 6 and placed on the support 22, the inner wall of the reversing ratchet seat hole 80 (i.e., the inner flanged wall) of the inner wrench plate 8 is fitted to the outer peripheral wall of the positioning ring 6, the inner wall of the body portion 8a of the inner wrench plate 8 touches the top surface of the support 22, then the stopper cover 9 is fitted around the outer periphery of the reversing ratchet seat hole 80 of the inner wrench plate 8 so as to be placed on the outer wall of the body portion 8a of the inner wrench plate 8, and finally, the upper die plate 4 is fixedly attached to the bottom of the slide body of the press, and the slide body can vertically move up and down.

After the preparation is finished, the press machine is started and driven, the upper die plate 4, the upper die body 3 and the positioning ring 6 all move downwards, the folded edge 81 is bent and restrained in the limiting groove 30, the pressure spring 5 enters the guide hole 10 along with the head of the connecting bolt 7 when being compressed until the upper die head 31 abuts against the height limiting part 21, and at the moment, the upper end part of the folded edge 81 forms a folded edge 82 and is pressed on a step of the step hole 90 of the brake cover 9.

After the wrench inner plate 8 is press-riveted, as shown in fig. 5 and 6, a radial gap Q is formed between the small end of the step hole 90 of the brake cover 9 and the reversing ratchet seat hole 80 of the wrench inner plate 8, and the radial gap Q is 0.5-0.8 mm and is used for filling lubricating grease; after the precision of the flanging height H of the inner wrench plate 9 is guaranteed, a proper axial clearance Q1 is provided between the hole of the brake cover and the inner wrench plate along the flanging part 91, and the axial clearance value is 0.3-0.5 mm.

The well-known reversing ratchet wheel is in threaded connection with a long shaft of the lever block, and the reversing ratchet wheel is accommodated in a reversing ratchet wheel seat hole, after the positioning ring is additionally arranged, the size of the hole diameter of the reversing ratchet wheel seat hole before and after riveting can be ensured to be consistent (56mm), so that the reversing ratchet wheel rotates smoothly without interference.

Claims

1. The utility model provides a riveting set of lever block spanner inner panel and stopper cover, includes the lower bolster, fixes the die holder on the lower bolster, interval arrangement at the last die body of die holder top, fixes the cope match-plate pattern on last die body, its characterized in that: the mandrel seat is provided with a lower height limiting part at the center and a higher supporting part for placing the wrench inner plate at the periphery, a containing groove is arranged between the height limiting part and the supporting part, and a double-step through hole is axially arranged at the bottom of the containing groove;

the double-step through hole is provided with a pressure spring and a connecting bolt in a sliding way, a positioning ring is arranged in the containing groove,

the pressure spring is arranged in an upper step hole of the double-step through hole, the positioning ring is supported on the pressure spring, the exposed section of the positioning ring, which is exposed out of the core mold seat, is sleeved with a reversing ratchet wheel seat hole of the wrench inner plate, and the connecting bolt extends into the upper step hole from a lower step hole of the double-step through hole, penetrates through the pressure spring and then is in threaded connection with the positioning ring;

the upper die body is provided with a body part, a necking part and an upper die head, wherein the necking part extends along the body part in sequence in the axial direction;

the upper die head is vertically aligned with the height limiting part, the diameter of the upper die head is matched with the inner diameter of the positioning ring, the necking part corresponds to the upper and lower intervals of the positioning ring, and the diameter of the necking part is equal to the outer diameter of the positioning ring; the lower template is at least uniformly provided with three guide holes, the number of the double-step through holes is equal to that of the guide holes, each double-step through hole is communicated with the corresponding guide hole, and the hole center of each double-step through hole is aligned with the hole center of the corresponding guide hole.

2. The riveting device of the inner plate of the lever block wrench and the brake cover according to claim 1, wherein: the limiting groove is provided with a groove top wall and a groove bottom wall, and the groove top wall and the groove bottom wall jointly form a horizontal semi-U shape.