Reinforcing steel bar prestress tensile machine capable of rapidly clamping and remodeling

Abstract

The utility model provides a rapid clamping and remodeling steel bar prestress tensile machine which comprises a supporting frame with a rectangular mounting cavity, an upper clamping oil cylinder vertically and downwards fixed to the top of the mounting cavity, an upper clamp assembly fixed to the end of a piston rod of the upper clamping oil cylinder, and a lower clamping oil cylinder vertically and upwards fixed to the bottom of the mounting cavity. The lower clamp assembly is fixed to the end of a piston rod of the lower clamping oil cylinder. First through holes allowing steel bars to penetrate through are formed in the two side walls of the supporting frame in the horizontal direction, an upper V-shaped jaw with a downward opening is formed in the bottom of the upper clamp assembly, and a lower V-shaped jaw with an upward opening is formed in the top of the lower clamp assembly. The upper V-shaped jaw and the lower V-shaped jaw can clamp a reinforcing steel bar inserted into the first through hole after getting close to each other; a pre-tensioning oil cylinder is fixedly installed on one outer side of the first through hole in the horizontal direction, and the pre-tensioning oil cylinder is provided with a second through hole concentric with the first through hole. The steel bar clamping device can be compatible with steel bars of various specifications, and the steel bars can be rapidly clamped and remodeled.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of steel bar processing and production, and particularly relates to a quick clamping and changing type steel bar prestressed tension machine for static load test and residual stress elimination of steel bar wire head after steel bar upsetting and sleeving. BACKGROUND

[0002] In the field of building engineering, the steel bar upsetting process is an important processing procedure, and the procedure mainly comprises the following key steps: firstly, a cutting machine is used to cut the steel bar and ensure the end part of the steel bar to be flat, thereby laying a foundation for subsequent processing; then, an upsetting machine is used to perform upsetting operation on the end part of the steel bar, so that the diameter of the end part of the steel bar is increased; finally, a sleeving machine is used to process the steel bar segment that has been upset into straight thread, so as to meet the process requirement of connection. However, in the processing of steel bar upsetting and sleeving, the upsetting transition section and the thread part of the steel bar are prone to residual stress concentration phenomenon. The harm caused by such residual stress is multi-faceted and extremely serious, such as reducing the stability of the steel reinforced concrete structure, reducing the yield limit of the material, reducing the fatigue life of the material, increasing the possibility of brittle fracture of the material, stress corrosion cracking, etc.

[0003] At present, the steel bar prestressed tension machine used in the prestressed tension test of the steel bar has many deficiencies. The clamping mechanism of the machine generally adopts single oil cylinder design. In the clamping mode, the upper and lower jaws of the clamp generally adopt circular arc clamping surface. The limitation of this design is that a clamp of one specification can only correspond to a specific type of steel bar. When different types of steel bars need to be tested, the upper and lower jaws matching the steel bars must be replaced. This process is not only cumbersome and requires a lot of manpower and time, but also has extremely low changing efficiency, which seriously affects the overall progress of the test. Especially in large-scale building engineering detection projects, frequent changing operation will cause the test period to be greatly extended, which cannot meet the demand of efficient and rapid detection.

[0004] In addition, after the steel bar tension test is completed, due to the single oil cylinder clamping mode, the jaws on the fixed side of the tension machine will be tightly engaged with the steel bar, and the steel bar is difficult to be quickly taken out of the jaws. The operator often needs to shake the steel bar first to separate the steel bar from the jaws, and then take out the steel bar. This operation method is extremely inconvenient, not only increases the labor intensity of the operator, but also in the shaking process, due to the severe friction and collision between the steel bar and the jaws, the clamp is easily damaged. SUMMARY

[0005] The utility model solves the technical problem of the prior art and provides a quick clamping and changing type steel bar prestressed tension machine, which can be compatible with multiple specifications of steel bars and can realize quick clamping and changing of the steel bars.

[0006] To solve the above technical problems, the utility model discloses a content includes:

[0007] A quick clamping and changing type steel bar prestressed tension machine, including the rectangular support frame along the vertical direction is provided with rectangular mounting cavity in the inside of support frame, the mounting cavity from top to bottom and along the same vertical direction are sequentially provided with upper clamping oil cylinder, upper clamp subassembly, lower clamp subassembly and lower clamping oil cylinder, the upper clamping oil cylinder is vertically fixed in the top of mounting cavity, and the upper clamp subassembly is fixed in the piston rod end of upper clamping oil cylinder, and the lower clamping oil cylinder is vertically fixed in the bottom of mounting cavity, and the lower clamp subassembly is fixed in the piston rod end of lower clamping oil cylinder, the first through -hole for the steel bar to pass through is opened in the two side walls of support frame and along the horizontal direction, and the upper clamp subassembly and lower clamp subassembly are opposite and are located the upper and lower sides of first through -hole respectively, the bottom of upper clamp subassembly has the upper V -shaped jaw of opening downward, and the top of lower clamp subassembly has the lower V -shaped jaw of opening upward, after the upper clamp subassembly and lower clamp subassembly are close to each other, can utilize the steel bar that is inserted in first through -hole and is clamped with two V -shaped jaws, the outer side of first through -hole is fixed along the horizontal direction and is installed with pre -tensioning oil cylinder, and the pre -tensioning oil cylinder has the second through -hole concentric with first through -hole.

[0008] Preferably, the bottom of the support frame is fixedly provided with two left and right supporting legs.

[0009] Preferably, the front and rear sides of the support frame are provided with housings, and the control module for controlling the upper clamping oil cylinder, the lower clamping oil cylinder and the pre-tensioning oil cylinder is arranged on the housing of the front side.

[0010] Preferably, the other outer side of the first through-hole is provided below with a steel bar supporting mechanism; the steel bar supporting mechanism comprises a supporting cylinder fixed on the support frame, the supporting cylinder is vertically arranged and an elastic supporting rod is inserted into the inner cavity of the supporting cylinder, and a supporting pulley is arranged on the top of the elastic supporting rod.

[0011] Preferably, the upper clamp subassembly and the lower clamp subassembly are symmetrically arranged about the first through-hole.

[0012] Preferably, the front side of the support frame is provided with an upper displacement sensor and a lower displacement sensor through upper and lower supports respectively, the upper displacement sensor is used for monitoring the downward displacement distance of the upper clamp subassembly, and the lower displacement sensor is used for monitoring the upward displacement distance of the lower clamp subassembly.

[0013] Preferably, the upper V-shaped jaw and the lower V-shaped jaw each have a V-shaped clamping surface of 120°.

[0014] Preferably, the V-shaped clamping surfaces of the upper V-shaped jaw and the lower V-shaped jaw are each provided with a comb tooth.

[0015] The utility model discloses the beneficial effect is:

[0016] The utility model discloses have extensive applicability, be applicable to the steel bar of the steel bar nominal diameter between phi 16 to phi 50mm. The utility model discloses through two clamping oil cylinders of upper and lower drive two clamp subassemblies of upper and lower, realized synchronous clamping steel bar's high -efficient operation mode. Two clamp subassemblies's upper and lower jaws all adopt the unique V -shaped clamping face design, compared with the traditional arc clamping face, this V -shaped clamping face makes a kind of specification's clamp to be compatible with multiple specifications steel bar, when carrying out test to steel bar of different diameters, the upper and lower jaws of clamp need not frequently change, not only greatly simplifies the operation process of steel bar change type, reduces manpower investment and time cost, also significantly improves the overall efficiency of test. When steel bar tensile test is completed, upper and lower clamping oil cylinders can be synchronized back, and clamp and steel bar can be automatically separated, and operating personnel can easily and quickly take out steel bar, without shaking steel bar, not only reduce the labor intensity of operating personnel, but also can effectively protect clamp, prolong its service life.

[0017] The utility model discloses adopt the way of static loading, and the static force is accurately acted on steel wire head, and continuously keeps a period of time, can carry out strict load test to steel wire head on one hand, accurately determines the performance parameter of steel wire head under different static force load, provides scientific, reliable data basis for the quality evaluation of steel bar, can effectively eliminate the residual stress of steel wire head in the upsetting and sleeving process on the other hand. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole machine structure schematic diagram of the utility model;

[0019] Figure 2 It is the internal structure perspective view of the utility model;

[0020] Figure 3 It is the internal structure front view of the utility model;

[0021] Figure 4 It is the structure schematic diagram of support frame;

[0022] Figure 5 It is the structure schematic diagram of pre -tension oil cylinder;

[0023] Figure 6 It is the structure schematic diagram of upper and lower clamp subassembly;

[0024] Figure 7 It is the perspective view of lower V -shaped jaw;

[0025] Figure 8 It is the side view of lower V -shaped jaw.

[0026] In the figure: 110, support frame, 111, first through hole, 120, upper clamping oil cylinder, 130, lower clamping oil cylinder, 140, pre-tensioning oil cylinder, 141, second through hole, 150, upper clamp assembly, 151, upper V-shaped jaw, 160, lower clamp assembly, 161, lower V-shaped jaw, 170, upper displacement sensor, 180, lower displacement sensor, 190, steel bar, 200, steel bar supporting mechanism, 201, support leg, 202, shell, 203, control module. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments. Those skilled in the art should understand that the embodiments are only to help understand the present application and should not be regarded as a specific limitation on the present application.

[0028] As Figures 1-8 shown, the present application provides a kind of steel bar prestressed tensioning machine of quick clamping change type, including rectangle support frame 110 being arranged along vertical direction, and the inside of support frame 110 has rectangle installation cavity, installation cavity is also arranged along vertical direction.The upper clamping oil cylinder 120, upper clamp assembly 150, lower clamp assembly 160 and lower clamping oil cylinder 130 are sequentially arranged in installation cavity from top to bottom and along the same vertical direction;Upper clamping oil cylinder 120 is vertically fixed at the top of installation cavity, upper clamp assembly 150 is fixed at the piston rod end of upper clamping oil cylinder 120, lower clamping oil cylinder 130 is vertically fixed at the bottom of installation cavity, and lower clamp assembly 160 is fixed at the piston rod end of lower clamping oil cylinder 130;Two side walls of support frame 110 and along the horizontal direction are provided with first through hole 111 for steel bar to pass through, and upper clamp assembly 150 and lower clamp assembly 160 are opposite and respectively located on the upper and lower sides of first through hole 111;The bottom of upper clamp assembly 150 has downwardly open upper V-shaped jaw 151, and the top of lower clamp assembly 160 has upwardly open lower V-shaped jaw 161;After upper clamping oil cylinder 120 and lower clamping oil cylinder 130 drive upper clamp assembly 150 and lower clamp assembly 160 to approach each other, the steel bar 190 inserted in first through hole can be clamped by the upper and lower V-shaped jaws;The outer side of first through hole 111 is fixed with pre-tensioning oil cylinder 140 along the horizontal direction, and the pre-tensioning oil cylinder 140 has second through hole 141 concentric with first through hole 111.

[0029] As Figures 1-3 shown, the bottom of support frame 110 is fixedly provided with left and right two support legs 201, and the support leg 201 is used to support and fix support frame 110.Upper clamping oil cylinder 120, lower clamping oil cylinder 130 and pre-tensioning oil cylinder 140 are all fixedly installed on support frame 110, and support frame 110 can withstand the reaction force of each oil cylinder.

[0030] The support frame 110 has housings 202 on both its front and rear sides, which protect the components installed in the mounting cavity. The front housing 202 also has a control module 203 for operating the upper clamping cylinder 120, the lower clamping cylinder 130, and the pre-tensioning cylinder 140. The control module 203 is also connected to an external hydraulic-electric control system.

[0031] A reinforcing bar support mechanism 200 is provided below the other outer side of the first through hole 111. The reinforcing bar support mechanism 200 includes a support cylinder fixed to the support frame 110. The support cylinder is vertically arranged and an elastic support rod is inserted into its inner cavity. A support pulley is provided at the top of the elastic support rod. The end of the reinforcing bar 190 has been upset and threaded. The threaded end of the reinforcing bar 190 is inserted into the other outer side of the first through hole 111 along the support pulley and finally inserted into the second through hole 141 of the pre-tensioning cylinder 140. The pre-tensioning cylinder 140 is used to apply an axial static load to the threaded end of the reinforcing bar 190.

[0032] The upper clamp assembly 150 and the lower clamp assembly 160 are symmetrically arranged about the first through hole 111. The upper clamp assembly 150 and the lower clamp assembly 160 are identical in shape and size, differing only in their mounting positions. The upper V-jaw 151 and the lower V-jaw 161 are also identical in shape and size, differing only in their mounting positions.

[0033] An upper bracket and a lower bracket are fixedly mounted on the front side of the support frame 110. An upper displacement sensor 170 is mounted on the upper bracket, and a lower displacement sensor 180 is mounted on the lower bracket. The upper displacement sensor 170 is used to monitor the downward movement distance of the upper clamping assembly 150, and the lower displacement sensor 180 is used to monitor the upward movement distance of the lower clamping assembly 160. The two displacement sensors ensure that the movements of the upper clamping assembly 150 and the lower clamping assembly 160 are synchronized.

[0034] Both the upper V-jaw 151 and the lower V-jaw 161 have a 120° V-shaped clamping surface, and comb teeth are provided on the V-shaped clamping surfaces of both the upper V-jaw 151 and the lower V-jaw 161 to facilitate engagement with the reinforcing bar ribs and achieve better clamping of the reinforcing bars. Figure 7 , 8 As shown, only the V-shaped clamping surface and comb tooth structure of the lower V-shaped jaw 161 are displayed.

[0035] The upper V-shaped jaw 151 contacts the upper part of the reinforcing bar 190, and the lower V-shaped jaw 161 contacts the lower part of the reinforcing bar 190. The comb teeth on the upper and lower V-shaped clamping surfaces engage with the reinforcing bar 190 from both directions. The upper V-shaped jaw 151 and the lower V-shaped jaw 161 are compatible with various specifications of reinforcing bars, and the jaw mold does not need to be changed when changing the shape of the reinforcing bar during operation.

[0036] The working steps of this utility model are as follows:

[0037] 1) the wire head of the steel bar 190 is inserted into the second through hole 141 from the first through hole 111; 2) the upper clamping oil cylinder 120 and the lower clamping oil cylinder 130 are started at the same time, the upper clamp assembly 150 and the lower clamp assembly 160 are driven to move synchronously, the radial pressure is applied to the steel bar 190 from the upper and lower sides respectively, the upper V-shaped jaw 151 and the lower V-shaped jaw 161 are engaged with the steel bar 190, so that the axial movement of the steel bar 190 is limited; 3) the pre-tensioning oil cylinder 140 is started to move, the axial tension is applied to the wire head of the steel bar 190, the static load is detected, and the residual stress of the wire head of the steel bar is eliminated; 4) after the stretching is completed, the pre-tensioning oil cylinder 140 returns to the initial position, the upper clamping oil cylinder 120 and the lower clamping oil cylinder 130 return to the initial position, the upper clamp assembly 150 and the lower clamp assembly 160 are synchronously driven to move upward and downward respectively, the upper V-shaped jaw 151 and the lower V-shaped jaw 161 are separated from the steel bar 190; 5) the steel bar 190 is taken out.

[0038] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A rapid clamping and changing prestressing tensile testing machine for reinforcing bars, characterized in that, The system includes a rectangular support frame (110) arranged vertically, and the interior of the support frame (110) has a rectangular mounting cavity. In the mounting cavity, from top to bottom and along the same vertical direction, an upper clamping cylinder (120), an upper clamping assembly (150), a lower clamping assembly (160), and a lower clamping cylinder (130) are sequentially arranged. The upper clamping cylinder (120) is vertically fixed downwards at the top of the mounting cavity, the upper clamping assembly (150) is fixed to the piston rod end of the upper clamping cylinder (120), the lower clamping cylinder (130) is vertically fixed upwards at the bottom of the mounting cavity, and the lower clamping assembly (160) is fixed to the piston rod end of the lower clamping cylinder (130). Reinforcing bars are provided in the two side walls of the support frame (110) along the horizontal direction. The upper clamp assembly (150) and the lower clamp assembly (160) are positioned opposite each other and located on the upper and lower sides of the first through hole (111), respectively. The bottom of the upper clamp assembly (150) has an upper V-shaped jaw (151) with an opening facing downwards, and the top of the lower clamp assembly (160) has a lower V-shaped jaw (161) with an opening facing upwards. When the upper clamp assembly (150) and the lower clamp assembly (160) are close to each other, the upper and lower V-shaped jaws can be used to clamp the reinforcing bar (190) inserted in the first through hole. A pre-tensioning cylinder (140) is fixedly installed on one side of the first through hole (111) along the horizontal direction, and the pre-tensioning cylinder (140) has a second through hole (141) concentric with the first through hole (111).

2. The rebar prestressing tensile testing machine with rapid clamping and changing according to claim 1, characterized in that, The bottom of the support frame (110) is fixedly provided with two left and right support legs (201).

3. The rebar prestressing tensile testing machine with rapid clamping and changing according to claim 1, characterized in that, The support frame (110) is provided with a housing (202) on both the front and rear sides, and the housing (202) on the front side is provided with a control module (203) for operating the upper clamping cylinder (120), the lower clamping cylinder (130) and the pre-tensioning cylinder (140).

4. A rapid clamping and changing prestressed steel bar tensioning machine according to claim 1, characterized in that, A steel bar support mechanism (200) is provided on the other side of the first through hole (111); the steel bar support mechanism (200) includes a support cylinder fixed on the support frame (110), the support cylinder is vertically arranged and an elastic support rod is inserted in its inner cavity, and a support pulley is provided on the top of the elastic support rod.

5. A rapid clamping and changing prestressed steel bar tensioning machine according to claim 1, characterized in that, The upper clamp assembly (150) and the lower clamp assembly (160) are symmetrically arranged about the first through hole (111).

6. A rapid clamping and changing prestressed steel bar tensioning machine according to claim 1, characterized in that, The front side of the support frame (110) is equipped with an upper displacement sensor (170) and a lower displacement sensor (180) respectively via upper and lower brackets. The upper displacement sensor (170) is used to monitor the downward movement distance of the upper clamp assembly (150), and the lower displacement sensor (180) is used to monitor the upward movement distance of the lower clamp assembly (160).

7. A rapid clamping and changing prestressed steel bar tensioning machine according to claim 1, characterized in that, Both the upper V-jaw (151) and the lower V-jaw (161) have a 120° V-shaped clamping surface.

8. A rapid clamping and changing prestressed steel bar tensioning machine according to claim 1, characterized in that, Comb teeth are provided on the V-shaped clamping surfaces of both the upper V-shaped jaw (151) and the lower V-shaped jaw (161).

Images