CN203236739U - Bolt pre-tightening assisting device of press machine - Google Patents
Bolt pre-tightening assisting device of press machine Download PDFInfo
- Publication number
- CN203236739U CN203236739U CN 201320203055 CN201320203055U CN203236739U CN 203236739 U CN203236739 U CN 203236739U CN 201320203055 CN201320203055 CN 201320203055 CN 201320203055 U CN201320203055 U CN 201320203055U CN 203236739 U CN203236739 U CN 203236739U
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- bolt
- tightening
- pretension
- coil
- forcing press
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Abstract
The utility model relates to the field of mechanism device manufacturing and discloses a bolt pre-tightening assisting device of a press machine. The press machine comprises a machine seat. A pillar is arranged on the machine seat. A pre-tightening bolt penetrates through the pillar. An end portion of the pre-tightening bolt is fixedly connected with a pre-tightening nut. The bolt pre-tightening device is characterized in that an opening is formed in the pillar. A heat insulating layer is machined on the pre-tightening bolt in the opening in a covered mode. A coil is formed on the heat insulating layer in a wound mode. The coil is sequentially and electrically connected with a transformer and an alternating current power supply. According to the bolt pre-tightening device of the press machine, the electro-magnetic induction vortex heating technology is used for heating the bolt, the bolt is evenly heated and expanded to an expected elongation and then the nut is tightly screwed so as to achieve the aim of pre-tightening the bolt.
Description
Technical field
The utility model relates to press equipment, particularly a kind of forcing press tools for bolts ' pretension servicing unit.
Background technology
Forcing press can be widely used in the techniques such as cut-out, punching, blanking, bending, riveted and shaping, is the visual plant that modern metal forming is made.The size of the installation pretightening force of four turnbuckles of forcing press is to be related to the key that can forcing press work.At present, the main method of regulating pretightning force has moment method, turn-nut method and bolt to extend in advance method, moment method and turn-nut method are connected to tight a bolt and connect to reach the increasing pretightning force by applying moment, mainly adopt the instruments such as spanner, this method can only in the situation that pretightning force do not adopt very much; In advance elongation method of bolt is to heat to bolt by firing equipment, make bolt be subjected to fastening nut after the thermal stretching and pretension, usually the mode of heating is to adopt the flames such as oxygen or acetylene directly to heat bolt, and this mode is simple to operate, generally all adopts at present the heating of this kind method.Take the 8MN forcing press as example, the bolt overall length is 6785mm, but rack space is narrow, and the part that bolt can heat only has about 1000mm, and heated length is short, and operating difficulties and heating-up temperature are wayward, and therefore the pre-elongation of heating is subject to larger restriction.
Summary of the invention
The purpose of this utility model is to provide a kind of forcing press tools for bolts ' pretension servicing unit, adopts the electromagnetic induction eddy current heating technique that bolt is heated, and is heated evenly, and it is heated is elongated to fastening nut behind the expection elongation, reaches the purpose of tools for bolts ' pretension.
The utility model is achieved by the following technical solutions.
A kind of forcing press tools for bolts ' pretension servicing unit, wherein, described forcing press comprises support, and described support is provided with column, is penetrated with pretension bolt in the described column, the end of described pretension bolt is fastenedly connected with pre-load nut, it is characterized in that, described column is provided with opening, is positioned on the pretension bolt of described opening to have packed thermal insulation layer, be wound with coil on the described thermal insulation layer, described coil is electrically connected with transformer and AC power successively.
Characteristics of the present utility model and further the improvement are:
Described thermal insulation layer is asbestos.
Described AC power is variable-frequency power sources.
When described forcing press was the 8MN forcing press, effective heated length of described pretension bolt was 1000mm, and the coil turn of coiling is 94 circles.
Forcing press tools for bolts ' pretension servicing unit of the present utility model, by the electromagnetic induction eddy current principle of heating, the coil of the certain number of turn of coiling on pretension bolt is when coil and AC power connection, electric current can produce alternating magnetic field during by coil, makes the inner eddy electric field that produces of pretension bolt.Because the pretension bolt internal resistance value is very little, vortex current can reach very large intensity, and larger heat generation is arranged, and therefore utilizes this principle that pretension bolt is heated, and can make its elongation that reaches expection and pretension.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Fig. 1 is the overall structure schematic diagram of the forcing press of forcing press tools for bolts ' pretension servicing unit of the present utility model;
Fig. 2 is the structural representation of the forcing press tools for bolts ' pretension servicing unit shown in Fig. 1.
Among the figure: 1, pretension bolt; 2, thermal insulation layer; 3, coil; 4, pre-load nut; 5, support; 6, column.
The specific embodiment
With reference to Fig. 1, be the overall structure schematic diagram of the forcing press of forcing press tools for bolts ' pretension servicing unit of the present utility model; With reference to Fig. 2, be the structural representation of forcing press tools for bolts ' pretension servicing unit of the present utility model.Forcing press comprises support 5, support 5 is provided with column 6, be penetrated with pretension bolt 1 in the column 6, the end of pretension bolt 1 is fastenedly connected with pre-load nut 4, and column 6 is provided with opening, is positioned on the pretension bolt 1 of opening to have packed thermal insulation layer 2, thermal insulation layer 2 is asbestos, wrap with glass fiber thermal insulation layer 2 outsides, and its effect is to prevent that the high temperature on the pretension bolt 1 from passing on the coil 3, thereby damage coil 3; Be wound with coil 3 on the thermal insulation layer 2, coil 3 is electrically connected with transformer and AC power successively, and transformer is large anti-resistive depressor, and AC power is variable-frequency power sources (frequency converter), increases the alternative frequency of AC power, can increase the heating effect of pretension bolt 1; When coil 3 is connected with AC power, electric current can produce alternating magnetic field during by coil 3, make the inside of pretension bolt 1 produce eddy electric field, because the internal resistance value of pretension bolt 1 is very little, vortex current can reach very large intensity, and larger heat generation is arranged, thereby pretension bolt 1 is heated, make it be subjected to thermal stretching, reach the elongation of expection.
The utility model is according to the pretightning force in press technologies parameter size, and the relevant calculation by the electromagnetic induction eddy current heating draws pretension bolt and reaches required heating-up temperature, coil turn, transformer efficiency and the relation between heat time heating time of expection elongation.In the present embodiment, take the forcing press of 8MN as example, the AC power that adopts is 26KW, the diameter of pretension bolt 1 is 200mm, effectively heated length is 1000mm, and the number of turn of the coil 3 of coiling is 94 circles, and heating-up temperature is 300 ℃～350 ℃, be 5～6 hours heat time heating time, and it is 3.67mm that pretension bolt 1 reaches the expection elongation.
Forcing press tools for bolts ' pretension servicing unit of the present utility model, the heating power of coil 3 equals the thermal loss sum of pretension bolt 1 heating power demand and coil 3, and the required power of pretension bolt 1 heating comprises effective power, radiation heat loss's power of pretension bolt 1, convection heat losses's power of pretension bolt 1 and several parts such as conductive heat loss power of pretension bolt 1 of pretension bolt 1 heating.Be heated evenly during pretension bolt 1 heating of the present utility model, heat-transfer effect is good, in the heating process equipment is not produced thermal diffusion, guarantee the comprehensive mechanical performance that equipment is good, and simple to operate, equipment and drill shack are required low, can reduce financial resources and the material resources of enterprise investment substantial equipment, economize on the use of funds.
Although below by reference to the accompanying drawings embodiment of the present utility model is described, the utility model is not limited to above-mentioned specific embodiments, and above-mentioned specific embodiments only is schematic, guiding, rather than restrictive.Those of ordinary skill in the art in the situation that does not break away from the scope that the utility model claim protects, can also make a variety of forms under the enlightenment of this specification, these all belong to the row of the utility model protection.
Claims (3)
1. forcing press tools for bolts ' pretension servicing unit, wherein, described forcing press comprises support, and described support is provided with column, is penetrated with pretension bolt in the described column, the end of described pretension bolt is fastenedly connected with pre-load nut, it is characterized in that, described column is provided with opening, is positioned on the pretension bolt of described opening to have packed thermal insulation layer, be wound with coil on the described thermal insulation layer, described coil is electrically connected with transformer and AC power successively.
2. forcing press tools for bolts ' pretension servicing unit according to claim 1 is characterized in that, described thermal insulation layer is asbestos.
3. forcing press tools for bolts ' pretension servicing unit according to claim 1 is characterized in that, described AC power is variable-frequency power sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320203055 CN203236739U (en) | 2013-04-19 | 2013-04-19 | Bolt pre-tightening assisting device of press machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320203055 CN203236739U (en) | 2013-04-19 | 2013-04-19 | Bolt pre-tightening assisting device of press machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203236739U true CN203236739U (en) | 2013-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320203055 Expired - Fee Related CN203236739U (en) | 2013-04-19 | 2013-04-19 | Bolt pre-tightening assisting device of press machine |
Country Status (1)
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| CN (1) | CN203236739U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175162A (en) * | 2019-03-22 | 2020-05-19 | 湘潭大学 | Rock sample block single-side confining pressure applying device and confining pressure applying method |
| CN111238951A (en) * | 2019-03-22 | 2020-06-05 | 湘潭大学 | Rock sample block stress field simulation device |
-
2013
- 2013-04-19 CN CN 201320203055 patent/CN203236739U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175162A (en) * | 2019-03-22 | 2020-05-19 | 湘潭大学 | Rock sample block single-side confining pressure applying device and confining pressure applying method |
| CN111238951A (en) * | 2019-03-22 | 2020-06-05 | 湘潭大学 | Rock sample block stress field simulation device |
| CN111238949A (en) * | 2019-03-22 | 2020-06-05 | 湘潭大学 | Rock sample block confining pressure applying device under working condition of face-to-face rock breaking |
| CN111238952A (en) * | 2019-03-22 | 2020-06-05 | 湘潭大学 | Rock confining pressure applying device of rock breaking cutter under multiple rock breaking working conditions |
| CN111238949B (en) * | 2019-03-22 | 2023-03-14 | 湘潭大学 | Rock sample block confining pressure applying device under working condition of face-to-face rock breaking |
| CN111238951B (en) * | 2019-03-22 | 2023-11-24 | 中铁山河工程装备股份有限公司 | Rock test sample block stress field simulation device |
| CN111175162B (en) * | 2019-03-22 | 2024-02-23 | 湘潭大学 | Device and method for applying confining pressure on one side of rock sample block |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20140419 |