CN214391634U

CN214391634U - Frame preloading device

Info

Publication number: CN214391634U
Application number: CN202120330731.8U
Authority: CN
Inventors: 吴兴贵
Original assignee: MCC SFRE Heavy Industry Equipment Co Ltd
Current assignee: MCC SFRE Heavy Industry Equipment Co Ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-10-15
Anticipated expiration: 2031-02-05

Abstract

The utility model discloses a frame pre-tightening device, which comprises a stud penetrating through a frame and a fixed bottom plate, wherein the lower end of the stud is locked by a slotted nut, and the upper end of the stud is locked by a pre-tightening module; the stud is also provided with a pin hole below the slotted nut, and a split pin with a bent head is arranged in the pin hole. The utility model discloses a frame preloading device does not need to use hydraulic spanner, can easily pretension the bolt, and locking effect is good, need not back nut again after pretension, and can not become flexible forever; the method has wide application range, and all the racks and the bases which are connected by the large bolts with large pretightening force and the connection of all the parts can be used by the method, and the method is reliable; the screw bolt has various forms, one end of the screw bolt can be a nut or a double nut, and can also be directly inserted into a threaded hole; the large bolt is suitable, and the small bolt is also suitable; the pre-tightening force is easy to control, the manufacturing cost is low, the installation space is small, and the tool investment is saved.

Description

Frame preloading device

Technical Field

The utility model belongs to the technical field of metallurgical rolling device, concretely relates to frame preloading device.

Background

The frame of the 20-roller mill is usually fixed on the base through bolts, in order to enable the frame to be tightly attached to the base and meet production requirements, the connecting bolts need to be pre-tightened to a specified torque during installation, and a nut is arranged on the outer side of the pre-tightening nut in a back-to-back mode to play a role in preventing looseness. Generally, bolts used in the prior art are large, a hydraulic wrench is used for screwing nuts in a factory with a conditional condition in order to achieve a specified pre-tightening torque, a hammer is mostly used for screwing the nuts in a factory without the condition, the size of the pre-tightening force is difficult to grasp, the bolts are subjected to plastic deformation due to the fact that the pre-tightening force is too large, the bolts lose elasticity, the bolts are damaged in serious cases, the pre-tightening force is too small, and a pre-tightening effect cannot be achieved; and extra vibration is generated in the knocking process, the precision of the rack is affected, the use performance of the rolling mill is affected, the rack needs to be reinstalled during maintenance or replacement every time, the operation difficulty is very high, and a simpler, reliable and easily-maintained rack pre-tightening method is urgently needed in the whole industry.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a frame preloading device can be reliably, simple and convenient connection frame and base, is applicable to the frame and the base that the big pretightning force of all big bolts is connected to and the reliable connection of each part.

The utility model adopts the technical proposal that: a frame pre-tightening device comprises a stud penetrating through a frame and a fixed bottom plate, wherein the lower end of the stud is locked through a slotted nut, and the upper end of the stud is locked through a pre-tightening module; the stud is also provided with a pin hole below the slotted nut, and a split pin with a bent head is arranged in the pin hole.

The utility model is also characterized in that,

the pre-tightening module comprises a pre-tightening nut, the thread of the pre-tightening nut is embedded on the upper portion of the stud, a circle of pre-tightening screws are arranged in the circumferential direction of the pre-tightening nut, and the pre-tightening screws are used for locking the rack and the fixed bottom plate.

And a pressure-resistant base plate is further nested on the stud, the pressure-resistant base plate is arranged between the rack and the pre-tightening nut, and the pre-tightening screw is tightly pressed against the pressure-resistant base plate.

The pressure-resistant backing plate is made of steel material.

The pre-tightening screws are uniformly distributed along the circumferential direction of the pre-tightening nut.

The pre-tightening nut is arranged close to one side of the rack; the slotted nut is arranged close to one side of the fixed bottom plate.

The stud is connected with the pre-tightening nut through a thick thread; the pre-tightening screw and the pre-tightening nut are connected by adopting fine threads.

The head and the tail of the cotter pin are clamped in the groove of the slotted nut to prevent the slotted nut from rotating.

The utility model has the advantages that: the machine frame pre-tightening device can pre-tighten a bolt easily without using a hydraulic wrench, has good anti-loosening effect, does not need to back a nut after pre-tightening, and cannot be loosened permanently; the method has wide application range, and all the racks and the bases which are connected by the large bolts with large pretightening force and the connection of all the parts can be used by the method, and the method is reliable; the screw bolt has various forms, one end of the screw bolt can be a nut or a double nut, and can also be directly inserted into a threaded hole; the large bolt is suitable, and the small bolt is also suitable; the pre-tightening force is easy to control, the manufacturing cost is low, the installation space is small, and the tool investment is saved.

Drawings

Fig. 1 is a schematic structural diagram of a frame preloading device of the present invention;

FIG. 2 is a top view of FIG. 1;

fig. 3 is a stud structure diagram of a frame preloading device of the present invention;

fig. 4 is a structure diagram of a pre-tightening screw of a frame pre-tightening device according to the present invention;

fig. 5 is a structure diagram of a pre-tightening nut of a frame pre-tightening device according to the present invention;

fig. 6 is a structure view of a pressure-resistant cushion plate of a frame pre-tightening device of the present invention.

In the figure, 1, a stud, 2, a pre-tightening screw, 3, a pre-tightening nut, 4, a pressure-resistant backing plate, 5, a frame, 6, a fixed bottom plate, 7, a slotted nut and 8, a cotter pin.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model relates to a frame preloading device, as shown in figures 1 and 2, comprising a stud 1 (as shown in figure 3) which runs through a frame 5 and a fixed bottom plate 6, wherein the lower end of the stud 1 is locked by a slotted nut 7, and the upper end is locked by a preloading module; the stud 1 is also provided with a pin hole below the slotted nut 7, and a split pin 8 with a bent head is arranged in the pin hole.

The pre-tightening module comprises a pre-tightening nut 3 (shown in figure 5), the pre-tightening nut 3 is embedded at the upper part of the stud 1 in a threaded manner, a circle of pre-tightening screws 2 (shown in figure 4) are arranged along the circumferential direction of the pre-tightening nut 3, and the pre-tightening screws 2 are used for locking the rack 5 and the fixed bottom plate 6.

A pressure-resistant base plate 4 (shown in fig. 6) is further nested on the stud 1, the pressure-resistant base plate 4 is arranged between the rack 5 and the pre-tightening nut 3, and the pre-tightening screw 2 is tightly pressed against the pressure-resistant base plate 4.

The pressure-resistant mat 4 is made of a steel material.

The pre-tightening screws 2 are uniformly distributed along the circumferential direction of the pre-tightening nut 3.

The pre-tightening nut 3 is arranged close to one side of the rack 5; the slotted nut 7 is arranged close to one side of the fixed bottom plate 6.

The stud 1 and the pre-tightening nut 3 are connected by adopting a coarse thread; the pre-tightening screw 2 and the pre-tightening nut 3 are connected by adopting fine threads.

The head and tail parts of the cotter pin 8 are respectively blocked in the grooves of the slotted nut 7 to prevent the slotted nut 7 from rotating.

The utility model relates to a frame preloading device's application method specifically as follows:

when the equipment is installed, firstly, holes on a rack 5 and a fixed bottom plate 6 are drilled, then a stud 1 penetrates through the holes on the rack 5 and the fixed bottom plate 6, a pin hole is arranged below the stud 1, a slotted nut 7 is screwed in from the lower part of the stud 1, when the pin hole below the stud 1 is exposed from a slotted nut 7 groove, the screwing is stopped, at the moment, a cotter pin 8 is inserted into the pin hole below the stud 1 through the slotted nut 7 groove, the head part of the cotter pin 8 is bent, a pressure-resistant backing plate 4 is put in from the upper part of the stud 1 and falls on the upper top surface of the rack 5, the center of a pre-tightening nut 3 is provided with a coarse-tooth internal thread matched with the stud 1, the outer ring is provided with a plurality of fine-tooth internal threads matched with pre-tightening screws 2, the pre-tightening nut 3 is manually screwed in from the upper part of the stud 1 until the pressure-resistant backing plate 4 is compacted, at the moment, the pre-tightening screws 2 are screwed into corresponding holes of the pre-tightening nut 3 one by one, the pre-tightening screws 2 are fine threads, one end of each pre-tightening screw is of an outer hexagonal structure, so that a wrench can conveniently tighten the pre-tightening screws, the other end of each pre-tightening screw is of a spherical top, and after all the pre-tightening screws 2 abut against the pressure-resistant base plate 4, the pre-tightening screws 2 are sequentially tightened one by the wrench to set torque.

The lower end of the stud 1 can also be directly inserted into a threaded blind hole of the fixed bottom plate 6, and a cotter pin 8 and a slotted nut 7 are omitted.

Claims

1. The machine frame pre-tightening device is characterized by comprising a stud (1) penetrating through a machine frame (5) and a fixed bottom plate (6), wherein the lower end of the stud (1) is locked through a slotted nut (7), and the upper end of the stud (1) is locked through a pre-tightening module; the stud (1) is also provided with a pin hole below the slotted nut (7), and a split pin (8) with a bent head is arranged in the pin hole.

2. The machine frame pre-tightening device according to claim 1, characterized in that the pre-tightening module comprises a pre-tightening nut (3), the pre-tightening nut (3) is embedded at the upper part of the stud (1) in a threaded manner, a circle of pre-tightening screws (2) are arranged along the circumferential direction of the pre-tightening nut (3), and the pre-tightening screws (2) are used for locking the machine frame (5) and the fixed bottom plate (6).

3. The machine frame preloading device according to claim 2, characterized in that a pressure-resistant backing plate (4) is further nested on the stud (1), the pressure-resistant backing plate (4) is arranged between the machine frame (5) and the preloading nut (3), and the preloading screw (2) is pressed against the pressure-resistant backing plate (4).

4. A frame pretensioning device according to claim 3, characterised in that the pressure-resistant shim plate (4) is made of steel material.

5. A frame pretensioning device according to claim 2, characterized in that the pretensioning screws (2) are evenly distributed in the circumferential direction of the pretensioning nut (3).

6. A frame pretensioning device according to claim 2, characterized in that the pretensioning nut (3) is arranged close to one side of the frame (5); the slotted nut (7) is arranged close to one side of the fixed bottom plate (6).

7. The frame preloading device according to claim 2, characterized in that the stud (1) and the preloading nut (3) are connected by a coarse thread; the pre-tightening screw (2) is connected with the pre-tightening nut (3) through fine threads.

8. A frame pretensioning device according to claim 1, characterised in that the head and tail of the cotter pin (8) respectively catch in the groove of the slotted nut (7) preventing the slotted nut (7) from rotating.