CN108908694B

CN108908694B - Steel bar prestress tensioning machine

Info

Publication number: CN108908694B
Application number: CN201810700024.6A
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2023-09-01
Anticipated expiration: 2038-06-29
Also published as: CN108908694A

Abstract

The invention relates to a steel bar prestress tensioning machine, wherein a second driving mechanism drives a nut sleeve and a nut to synchronously rotate, an elastic piece always has a trend of pushing the nut sleeve to slide along the direction of a tensioning assembly, and the sliding direction of the nut sleeve is consistent with that of a first driving mechanism. The design of such first drive mechanism not only transmits rotatory power to the nut cover, still has the effect of direction concurrently simultaneously, makes the nut cover slide along fuselage axial all the time, and the cooperation of elastic component and nut cover can guarantee that the nut cover can not break away from by the roof pressure on the nut all the time, under elastic component and first drive mechanism combined action, the nut cover not only can drive the nut rotation, can also tightly push up on the nut, and simple structure is exquisite, can last incessantly knob nut, can not break away suddenly.

Description

Steel bar prestress tensioning machine

Technical Field

The invention relates to the field of constructional engineering, in particular to a steel bar prestress tensioning machine.

Background

The prestress tensioning is to add tension in advance in the component, so that the prestressed tensioning component bears tensile stress, and further the prestressed tensioning component generates certain deformation to cope with loads born by the structure, including loads of the component, and the like.

In the existing precast pile or pipe pile production process, in order to obtain a product with higher strength, a jack-type tensioning machine is required to carry out integral prestress tensioning on the centrifugal square pile steel reinforcement framework after the die assembly, and pre-stress is applied before the centrifugal square pile steel reinforcement framework bears external load, so that the rigidity, bending resistance and rigidity of the structure can be improved, vibration and elastic deformation are reduced, the occurrence time of cracks is delayed, and the durability of the structure is improved. When the steel bar in the pipe die is stretched by the stretching machine, the length can be prolonged in the axial direction, after the stretching action is finished, the steel bar is required to retract to a certain extent, the prior art is to manually screw a large nut in the stretching machine to clamp the large nut and the stretching end plate, when the steel bar is retracted, the clamped large nut and the end plate play a clamping role in retracting, the large nut can be manually screwed to complete the task of clamping the retraction of the steel bar, but manual operation needs to be manually attended, the strength of the knob is also required to be ensured, the operation is time-consuming and labor-consuming, the requirement of automatic production is not met, and the manual operation error is also larger.

The technical staff makes certain improvement, for example, the Chinese patent with the patent number of CN201610113474.6 (publication number of CN 105563636A) discloses a tensioning machine, after tensioning action is completed, a tensioning oil cylinder keeps oil pressure, a compression cylinder works, a driving wheel and a driven wheel are attached to tension nut, a driving wheel driver works and drives the driving wheel to rotate, the driving wheel drives Zhang Lada nuts to rotate, the tension nut is screwed close to a tensioning end plate and is tightly attached to the tensioning end plate, the Zhang Lada nuts can axially move along the tensioning screw rod in the rotating process, the driving wheel can synchronously move with the tension nut, otherwise, the driving wheel and the tension nut can be misplaced and cannot drive the Zhang Lada nuts to further rotate, and although the additional cylinder is arranged on the tensioning machine, the driving wheel can axially move along the tensioning screw rod, but is difficult to ensure that the driving wheel and the tension nut are equidistantly moved in the same time, when the driving wheel and the tension nut cannot equidistantly move in the same working time, an axial displacement deviation is generated between the driving wheel and the tension nut, the displacement deviation can directly influence the tensioning distance between the tension nut and the tensioning end plate, and the tension nut, and the tension effect is influenced.

Disclosure of Invention

Aiming at the current state of the art, the invention provides the steel bar prestress tensioning machine which can realize follow-up with the tensioning large nut by automatic screwing and has high follow-up synchronization.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a reinforcing bar prestressing force stretch-draw machine, includes the fuselage, be provided with first actuating mechanism in the fuselage, still including setting up in the fuselage and with stretch-draw big nut can dismantle the nut cover of being connected, be used for driving nut cover and stretch-draw big nut synchronous rotation's second actuating mechanism and elastic component, the elastic component has the trend that can promote the nut cover to follow Zhang Lada nut to stretch-draw subassembly direction slip all the time, second actuating mechanism is through the first drive mechanism and the nut cover linkage of arranging along stretch-draw big nut slip direction, under the reinforcing bar is in the stretch-draw state, the nut cover can slide to first drive mechanism's head end under stretch-draw big nut's drive, the nut cover also can slide to first drive mechanism's tail end along with stretch-draw big nut synchronous under the effect of the elastic restoring force of elastic component, still be provided with the fender edge that prevents the nut cover slippage on the fuselage.

In order to realize synchronous movement of the nut sleeve along with the large tensioning nut, preferably, the nut sleeve is provided with a nut hole capable of accommodating the large tensioning nut, and one side of the nut sleeve, which is close to the elastic piece, is provided with a stop shoulder which partially covers the nut hole and is always abutted against the large tensioning nut.

Specifically, the nut sleeve comprises an outer sleeve meshed with the first transmission mechanism and an inner liner detachably connected to the outer sleeve, and the outer sleeve and the inner liner are fixedly connected through the stop shoulder.

Further, the outer sleeve is provided with a step which is matched with the elastic piece on one side of the elastic piece.

In order to ensure the rotation effect of the nut sleeve and support the nut sleeve, preferably, the nut sleeve further comprises a rotary supporting mechanism which is circumferentially arranged along the nut sleeve and can support and engage the nut sleeve, tooth grooves are formed in the first transmission mechanism and the rotary supporting mechanism along the sliding direction of the large tensioning nut, ring teeth on the periphery of the nut sleeve can be engaged with the tooth grooves, and the nut sleeve can slide back and forth along the tooth grooves.

In order to ensure that power is smoothly transmitted to the nut sleeve, windows matched with the first transmission mechanism and the rotary supporting mechanism are formed in the machine body along the circumferential direction, and the first transmission mechanism and the rotary supporting mechanism are connected to the machine body through fixing frames in a supporting mode and are partially accommodated in the windows.

In order to realize the stretch-draw to the framework of steel reinforcement, first actuating mechanism can drive stretch-draw subassembly motion so that the reinforcing bar takes place axial deformation, and stretch-draw subassembly has the cover to establish and can slide and block on fixed end plate in order to prevent the stretch-draw big nut that reinforcing bar deformation resumes on stretch-draw lead screw, first actuating mechanism is including setting up stretch-draw hydro-cylinder and the connecting axle jar on the fuselage, the connecting axle jar is interior to have the connecting axle, stretch-draw axle one end of stretch-draw hydro-cylinder gets into the connecting axle jar, connects on the connecting axle.

In order to ensure the clamping effect of the large tensioning nut, preferably, the tensioning assembly further comprises a tensioning fixing plate, a tensioning positioning sleeve and a clamping block which are connected with the steel bars, the clamping block is arranged at the head end of the tensioning screw rod, the tensioning plate is connected to the tail end of the tensioning screw rod, and the tensioning plate is connected with the tensioning fixing plate through the tensioning positioning sleeve. In order to ensure that the first driving mechanism can smoothly stretch the reinforcement cage and cannot slip off, preferably, a clamping mechanism is further arranged in the machine body, the clamping mechanism comprises a taper sleeve and clamping jaws which are circumferentially arranged along the connecting shaft and can be in sliding connection with the taper sleeve, and the taper sleeve can drive the clamping jaws to enable the connecting shaft to abut against the tensioning screw rod and link with the tensioning screw rod in the process of tensioning the reinforcement under the driving of the connecting shaft oil cylinder.

Specifically, the jack catch has first card foot and the second card foot that the interval set up, the connecting axle afterbody is seted up the adaptation the draw-in groove of first card foot, second card foot and fixture block cooperation.

Compared with the prior art, the invention has the advantages that: the steel bar prestress tensioning machine comprises a nut sleeve, a second driving mechanism and an elastic piece, wherein the nut sleeve is detachably connected with a tensioning large nut, the second driving mechanism is used for driving the nut sleeve and the tensioning large nut to synchronously rotate, the elastic piece always has a trend of pushing the nut sleeve to slide along Zhang Lada nuts towards a tensioning assembly direction, the second driving mechanism is linked with the nut sleeve through a first driving mechanism arranged along the sliding direction of the tensioning large nut, the nut sleeve can slide to the head end of the first driving mechanism under the driving of the tensioning large nut in a tensioning state, and the nut sleeve synchronously slides to the tail end of the first driving mechanism under the action of elastic restoring force of the elastic piece in a screwing state. The design of such first drive mechanism not only transmits rotatory power to the nut cover, still has the effect of direction concurrently simultaneously, make the nut cover slide along fuselage axial all the time, the cooperation of elastic component and nut cover can guarantee that the nut cover is by the roof pressure all the time can not break away from on stretching large nut, under elastic component and first drive mechanism combined action, the nut cover not only can drive stretching large nut and rotate, can also tightly push up on Zhang Lada nut, and a simple structure is exquisite, can last continuous knob Zhang Lada nut, can not break suddenly, the setting of fender shoulder can further realize elastic component ejector nut cover, the rotation effect and the support nut cover of nut cover are guaranteed to the rotation supporting mechanism that the fuselage circumference was arranged simultaneously.

Drawings

FIG. 1 is a cross-sectional view of the overall structure of a tensioning machine in accordance with an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

fig. 3 is a side view of a tensioner in an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 to 3, in a preferred embodiment of the present invention, the prestress tensioning machine for reinforcing steel bar comprises a machine body 1, wherein a first driving mechanism 11 is arranged in the machine body 1, the first driving mechanism 11 can drive a tensioning assembly 12 to move so as to enable the reinforcing steel bar to generate axial deformation, and the tensioning assembly 12 is provided with a tensioning large nut 2 which is sleeved on a tensioning screw rod 121 and can slide and be blocked on a fixed end plate 122 so as to prevent the reinforcing steel bar from being deformed and recovered. The steel bar prestress tensioning machine further comprises a nut sleeve 5, a second driving mechanism 3 and an elastic piece 7, wherein the nut sleeve 5 is arranged in the machine body 1 and is detachably connected with the tensioning large nut 2, the second driving mechanism 3 is used for driving the nut sleeve 5 and the tensioning large nut 2 to synchronously rotate, the elastic piece 7 always has a trend of pushing the nut sleeve 5 to slide along the tensioning large nut 2 towards the tensioning assembly 12, the second driving mechanism 3 is linked with the nut sleeve 5 through a first driving mechanism 8 arranged along the sliding direction of the tensioning large nut 2, the nut sleeve 5 can slide to the head end of the first driving mechanism 8 under the driving of the tensioning large nut 2 under the tensioning state of the steel bar, the nut sleeve 5 can also synchronously slide to the tail end of the first driving mechanism 8 along with the tensioning large nut 2 under the elastic restoring force of the elastic piece 7, and a blocking edge 5b for preventing the nut sleeve 5 from sliding is further arranged on the machine body 1. The design of the first transmission mechanism 8 not only transmits rotary power to the nut sleeve 5, but also has the guiding function, so that the nut sleeve 5 always slides along the axial direction of the machine body 1, the elastic piece 7 and the nut sleeve 5 are matched, the nut sleeve 5 can be ensured to be always pressed against the large tensioning nut 2 without separating, under the combined action of the elastic piece 7 and the first transmission mechanism 8, the nut sleeve 5 can not only drive the large tensioning nut 2 to rotate, but also tightly push against the large tensioning nut 2, the structure is simple and exquisite, and the large tensioning nut 2 can be continuously tensioned through a knob without abrupt interruption.

In this embodiment, the nut sleeve 5 has a nut hole capable of accommodating the large tensioning nut 2, a shoulder 5a that partially covers the nut hole and always abuts against the large tensioning nut 2 is provided on one side of the nut sleeve 5 near the elastic member 7, specifically, the nut sleeve 5 includes an outer sleeve 51 engaged with the first transmission mechanism 8 and an inner liner 52 detachably connected to the outer sleeve 51, the outer sleeve 51 and the inner liner 52 are fixedly connected through the shoulder 5a, and a step 511 adapted to the elastic member 7 is provided on one side of the outer sleeve 51 located near the elastic member 7.

Besides the first transmission mechanism 8, the machine body 1 further comprises a rotary supporting mechanism 9 which is circumferentially arranged along the machine body 1 and can support and engage with the nut sleeve 5, tooth grooves are formed in the first transmission mechanism 8 and the rotary supporting mechanism 9 along the sliding direction of the large tensioning nut 2, ring teeth on the periphery of the nut sleeve 5 can be engaged with the tooth grooves, the nut sleeve 5 can reciprocally slide along the tooth grooves, one or more rotary supporting mechanisms 9 can be used for supporting the nut sleeve 5 to stably rotate and slide, windows which are matched with the first transmission mechanism 8 and the rotary supporting mechanism 9 are formed in the machine body 1 along the circumferential direction, the first transmission mechanism 8 and the rotary supporting mechanism 9 are connected to the machine body 1 through fixing frames 1a in a supporting mode and are partially accommodated in the windows, and the fixing frames 1a are arranged at the edges of the windows, so that the first transmission mechanism 8 and the rotary supporting mechanism 9 can conveniently penetrate through the windows and are engaged with the ring teeth on the periphery of the nut sleeve 5.

In the present embodiment, the first driving mechanism 11 includes a tensioning cylinder 111 and a connecting shaft cylinder 112 provided on the machine body 1, an output shaft of the tensioning cylinder 111 is connected to the connecting shaft cylinder 112, and the transmission connection member 4 includes a tensioning shaft 41 and a connecting shaft 42, the connecting shaft 42 is accommodated in the connecting shaft cylinder 112, one end of the tensioning shaft 41 is connected to an output shaft of the tensioning cylinder 111, and the other end is connected to the connecting shaft 42 through the connecting shaft cylinder 112.

The tensioning assembly 12 in this embodiment further includes a tensioning fixing plate 123 connected to the steel bar, a tensioning plate 126, a tensioning positioning sleeve 125, and a clamping block 124, where the clamping block 124 is disposed at the head end of the tensioning screw 121, the tensioning plate 126 is connected to the tail end of the tensioning screw 121, and the tensioning plate 126 is connected to the tensioning fixing plate 123 through the tensioning positioning sleeve 125. In this embodiment, the machine body 1 is further provided with a clamping mechanism 6, the clamping mechanism 6 includes a taper sleeve 61 and a claw 62 which is circumferentially arranged along the connecting shaft 42 and can be slidably connected with the taper sleeve 61, the taper sleeve 61 can drive the claw 62 to clamp the connecting shaft 42 and the tensioning screw 121 under the driving of the connecting shaft cylinder 112, specifically, the claw 62 is provided with a first clamping leg 621 and a second clamping leg 622 which are arranged at intervals, a clamping space 6a for accommodating and limiting the clamping block 124 and further limiting the axial movement of the tensioning assembly 12 is formed between the first clamping leg 621 and the second clamping leg 622, a clamping groove 421 adapted to the first clamping leg 621 is formed at the tail of the connecting shaft 42, and the setting of the clamping mechanism 6 can ensure the connection strength when the connecting shaft 42 and the tensioning screw 121 synchronously move, so that the steel bar skeleton cannot slip from the tensioning machine in the tensioning process.

The working principle of the invention is as follows:

the tensioning cylinder 111 starts to work, the connecting shaft cylinder 112 is pushed to move forwards through the tensioning shaft 41, after the end part of the wire drawing rod 121 is tensioned on the top of the connecting shaft 42, the tensioning cylinder 111 stops and keeps oil pressure, then the connecting shaft cylinder 112 works, the taper sleeve 61 of the clamping mechanism 6 is pushed to move forwards, and as the inner side surface of the taper sleeve 61 and the outer side surface of the clamping claw 62 matched with the taper sleeve 61 have slopes, the clamping claw 62 can be driven to move forwards and shrink, and the first clamping foot 621 of the clamping claw 62 is just clamped in a clamping groove 421 formed in the tail part of the connecting shaft 42, so that clamping fixation of the clamping claw 62 and the connecting shaft 42 is realized; and a clamping space 6a is arranged between the first clamping leg 621 and the second clamping leg 622 of the claw 62, before the claw 62 is pushed and contracted by the taper sleeve 61, the tensioning screw rod 121 and the connecting shaft 42 are tightly propped, a clamping block 124 at the end part of the tensioning screw rod 121 is tightly propped against the end surface of the connecting shaft 42, after the claw 62 is contracted, the clamping block 124 is just accommodated in the clamping space 6a, the two ends are limited by the first clamping leg 621 and the second clamping leg 622 to prevent the two ends from moving axially, so that the clamping fixation of the claw 62 and the tensioning screw rod 121 is realized, then the tensioning cylinder 111 works again and pulls the connecting shaft cylinder 112 to move reversely, and the connecting shaft cylinder 112 drives the connecting shaft 42 and the tensioning screw rod 121 to move together, thereby forming tensioning action on the steel bars connected to the tail end of the tensioning screw rod 121 through the fixed end plate 122.

When tensioning is completed, the tensioning cylinder 111 keeps oil pressure, the second driving mechanism 3 starts to work at the moment, power of the second driving mechanism 3 is transmitted to the nut sleeve 5 through the first driving mechanism 8, the Zhang Lada nut 2 is finally driven to be screwed to the fixed end plate 122, at the moment, the elastic piece 7 tightly pushes the nut sleeve 5 on the tensioning large nut 2 all the time through the step 511 on the outer sleeve 51, the nut sleeve and the tensioning large nut 2 keep synchronous and slide towards the fixed end plate 122, and therefore the nut sleeve 5 can continuously screw the tensioning large nut 2, the fixed end plate 122 is finally clamped, and further the deformation of the reinforcing steel bars is blocked and recovered.

While the preferred embodiments of the present invention have been described in detail, it is to be clearly understood that the same may be varied in many ways by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a reinforcing bar prestressing force stretch-draw machine, includes fuselage (1), be provided with first actuating mechanism (11), its characterized in that in fuselage (1): the novel steel bar tensioning device is characterized by further comprising a nut sleeve (5) which is arranged in the machine body (1) and is detachably connected with the tensioning large nut (2), a second driving mechanism (3) and an elastic piece (7), wherein the second driving mechanism (3) is used for driving the nut sleeve (5) and the tensioning large nut (2) to rotate synchronously, the elastic piece (7) is always provided with a trend of pushing the nut sleeve (5) to slide along the tensioning large nut (2) towards the tensioning assembly (12), the second driving mechanism (3) is linked with the nut sleeve (5) through a first driving mechanism (8) which is arranged along the sliding direction of the tensioning large nut (2), the nut sleeve (5) can slide to the head end of the first driving mechanism (8) under the driving of the tensioning large nut (2) under the tensioning state of steel bars, and the nut sleeve (5) can also synchronously slide to the tail end of the first driving mechanism (8) along with the tensioning large nut (2) under the elastic restoring force of the elastic piece (7), and a blocking edge (5 b) for preventing the nut sleeve (5) from sliding off is further arranged on the machine body (1).

2. The reinforcing bar prestress tensioning machine of claim 1, wherein: the nut sleeve (5) is provided with a nut hole capable of accommodating the large tensioning nut (2), and one side, close to the elastic piece (7), of the nut sleeve (5) is provided with a shoulder (5 a) which partially covers the nut hole and is always propped against the large tensioning nut (2).

3. The reinforcing bar prestress tensioner as set forth in claim 2, wherein: the nut sleeve (5) comprises an outer sleeve (51) meshed with the first transmission mechanism (8) and an inner lining (52) detachably connected to the outer sleeve (51), and the outer sleeve (51) and the inner lining (52) are fixedly connected through the stop shoulder (5 a).

4. A bar prestress tensioner as set forth in claim 3, wherein: the outer sleeve (51) is provided with a step (511) which is matched with the elastic piece (7) on one side of the elastic piece (7).

5. The reinforcing bar prestress tensioning machine of any one of claims 1-4, wherein: still include along nut cover (5) circumference arrangement and can support and mesh rotatory supporting mechanism (9) of nut cover (5), tooth's socket has all been seted up along the slip direction of stretch-draw big nut (2) on first drive mechanism (8) and the rotatory supporting mechanism (9), the ring tooth of nut cover (5) periphery can mesh with the tooth's socket, and this nut cover (5) can follow the reciprocal slip of this tooth's socket.

6. The reinforcing bar prestress tensioning machine of claim 5, wherein: the machine body (1) is provided with windows which are matched with the first transmission mechanism (8) and the rotary supporting mechanism (9) along the circumferential direction, and the first transmission mechanism (8) and the rotary supporting mechanism (9) are connected to the machine body (1) through the fixing frame (1 a) in a supporting way and are partially accommodated in the windows.

7. The reinforcing bar prestress tensioning machine of claim 6, wherein: the first driving mechanism (11) can drive the tensioning assembly (12) to move so that the steel bars can axially deform, the tensioning assembly (12) is provided with a tensioning large nut (2) which is sleeved on a tensioning screw rod (121) and can slide to be clamped on a fixed end plate (122) so as to prevent the steel bars from being deformed and recovered, the first driving mechanism (11) comprises a tensioning cylinder (111) and a connecting shaft cylinder (112) which are arranged on the machine body (1), a connecting shaft (42) is arranged in the connecting shaft cylinder (112), and one end of a tensioning shaft (41) of the tensioning cylinder (111) enters the connecting shaft cylinder (112) and is connected to the connecting shaft (42).

8. The reinforcing bar prestress tensioning machine of claim 7, wherein: the tensioning assembly (12) further comprises a tensioning fixing plate (123), a tensioning plate (126), a tensioning locating sleeve (125) and a clamping block (124), wherein the tensioning fixing plate is connected with the reinforcing steel bars, the clamping block (124) is arranged at the head end of the tensioning screw rod (121), the tensioning plate (126) is connected to the tail end of the tensioning screw rod (121), and the tensioning plate (126) is connected with the tensioning fixing plate (123) through the tensioning locating sleeve (125).

9. The reinforcing bar prestress tensioning machine of claim 8, wherein: still be provided with joint mechanism (6) in fuselage (1), joint mechanism (6) include taper sleeve (61) and follow connecting axle (42) circumference arrangement and can with taper sleeve (61) sliding connection's jack catch (62), taper sleeve (61) can drive jack catch (62) under the drive of connecting axle cylinder (112) make connecting axle (42) and stretch-draw lead screw (121) offset and link up at the in-process of stretch-draw reinforcing bar.

10. The reinforcing bar prestress tensioning machine of claim 9, wherein: the claw (62) is provided with a first clamping foot (621) and a second clamping foot (622) which are arranged at intervals, a clamping groove (421) which is matched with the first clamping foot (621) is formed in the tail part of the connecting shaft (42), and the second clamping foot (622) is matched with the clamping block (124).