CN108908696B - Steel bar prestress tensioning machine - Google Patents

Abstract

The invention relates to a steel bar prestress tensioning machine, which drives a tensioning assembly to tension a steel bar framework through a first driving mechanism, wherein the tensioning assembly is provided with a nut sleeved on a tensioning screw rod and capable of sliding and being blocked on a fixed end plate to prevent the steel bar from being deformed and recovered, the tensioning assembly further comprises a driver capable of driving the nut to slide and follow up, the driver comprises a second driving mechanism for driving the nut to rotate, a transmission gear and a third driving mechanism capable of pushing the transmission gear to slide and mesh with the nut, and the nut is further provided with a baffle edge capable of abutting against the transmission gear and driving the driver to integrally slide along with the nut. The follow-up design of the upper blocking edge of the driver, which is propped against the nut, can realize the effects of nut rotation and axial follow-up of the driver and the nut only by one driving step, has simple and reasonable structure and ingenious design, and meanwhile, the blocking edge and the driver are matched without front-back displacement difference, so that the synchronization degree is very high, and the clamping effect of the nut is further ensured.

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 of the steel bar can be prolonged in the axial direction, so that the steel bar is required to retract to a certain extent after stretching action is completed, the large nut in the stretching machine is manually screwed to be clamped with the stretching end plate in the prior art, when the steel bar is retracted, the clamped large nut and the end plate can 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 is required to be manually attended, the strength of the knob is required to be ensured, time and labor are wasted in operation, the automatic production requirement 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 a Zhang Lada nut 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 nut 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 can not drive the Zhang Lada nut to further rotate, and an additional cylinder is arranged on the tensioning machine, so that the driving wheel can axially move along the tensioning screw rod although the driving wheel can not guarantee equidistant movement of the driving wheel and the tension nut 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 distance between the tension nut and the tensioning end plate, and the tensioning effect is further influenced.

Disclosure of Invention

Aiming at the current state of the art, the invention provides the steel bar prestress tensioning machine which is automatically screwed to realize the follow-up of the driver and the nut, and has the advantages of tight follow-up fitting and high 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, the fuselage is provided with first actuating mechanism, including the support that slidable set up on the fuselage, be provided with driver and assembly space on the support, the driver includes the second actuating mechanism that is used for driving stretch-draw big nut pivoted, with second actuating mechanism linkage and with stretch-draw big nut engaged with drive gear and can promote drive gear to stretch-draw big nut sliding engagement's third actuating mechanism, when stretch-draw big nut moves to keeping away from fixed end plate direction, stretch-draw big nut offsets and makes the driver follow stretch-draw big nut synchronous motion with the support, when stretch-draw big nut moves to being close to fixed end plate direction, big nut offsets and makes the driver follow stretch-draw big nut synchronous motion with drive gear.

In order to realize the driving function of the driver on the large tensioning nut, preferably, a sliding rail matched with the large tensioning nut is arranged in the bracket, the driver can slide back and forth relative to the sliding rail, so that the transmission gear is separated from or meshed with the large tensioning nut, and the blocking edge on the large tensioning nut can be abutted against the transmission gear in the meshed state of the transmission gear and the large tensioning nut.

In order to ensure the sliding effect, in particular, the driver further comprises a fixing frame and a sliding block arranged on the fixing frame, the second driving mechanism is arranged on the sliding block, the third driving mechanism is arranged on the fixing frame, the output end of the third driving mechanism is connected with one end of the sliding block, and the other end of the sliding block is provided with a transmission gear.

Further, a first driving wheel connected with the output shaft of the second driving mechanism is further arranged on the sliding block, the driving gear is coaxially connected with a second driving wheel, the first driving wheel and the second driving wheel are connected through a chain by adopting a chain wheel, or the first driving wheel and the second driving wheel are connected through gears in a meshed mode by adopting a gear set.

In order to realize the follow-up of the driver and the large tensioning nut, a sliding groove which is convenient for the driver to slide along the axial direction of the machine body along with the large tensioning nut is arranged on the machine body.

In order to realize the stretch-draw to the framework of steel reinforcement, the fuselage is provided with first actuating mechanism, first actuating mechanism can drive the stretch-draw subassembly motion so that the reinforcing bar takes place axial deformation, and the stretch-draw subassembly has the cover to establish and can slide and block the stretch-draw big nut that prevents the reinforcing bar deformation recovery on fixed end plate 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 is held to the connecting axle jar, and 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 without slipping, a clamping mechanism is preferably arranged in the machine body, the clamping mechanism comprises a taper sleeve and clamping claws 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 claws 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.

In order to ensure that the support slides in the machine body, the support is annular and is matched with the machine body, and the support is further provided with a supporting wheel which is convenient to prop against the inner wall of the machine body.

Compared with the prior art, the invention has the advantages that: the steel bar prestress tensioning machine is provided with a support which is propped against the back of the tensioning large nut in a state that the tensioning large nut moves away from the fixed end plate in a sliding manner in the machine body, a driver is arranged on the support, the driver comprises a second driving mechanism for driving the tensioning large nut to rotate, a transmission gear which is linked with the second driving mechanism and meshed with the tensioning large nut, and a third driving mechanism which can push the transmission gear to slide and mesh with the tensioning large nut, and a blocking edge which can prop against the transmission gear and drive the whole driver to slide along with the tensioning large nut to the fixed end plate direction is further arranged on the tensioning large nut. The driver is abutted against the follow-up design of the upper blocking edge of the large tensioning nut, the rotation of the large tensioning nut and the axial follow-up effect of the driver and the large tensioning nut can be realized only by one driving step, the structure is simple and reasonable, the design is ingenious, meanwhile, the front-back displacement difference can not occur when the blocking edge is matched with the driver, the synchronization degree is very high, and the clamping effect of the large tensioning nut is further ensured; the sliding rail on the support can ensure that the driver is smoothly meshed with the large tensioning nut, and the driving wheel on the driver is matched with a gear or a chain to ensure the efficiency of power transmission.

Drawings

FIG. 1 is a cross-sectional view of the overall structure of an embodiment of the present invention;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present invention;

Fig. 3 is a schematic view of the overall structure of fig. 2 with the fuselage omitted;

FIG. 4 is an enlarged schematic view of FIG. 3 at A;

FIG. 5 is a schematic diagram of the overall structure of a driver according to an embodiment of the present invention;

FIG. 6 is a schematic view showing the overall structure of the actuator in another direction according to the embodiment of the present invention;

FIG. 7 is a cross-sectional view of a driver in an embodiment of the invention;

FIG. 8 is a schematic diagram illustrating the cooperation of the driver with the sliding rail and the bracket according to an embodiment of the present invention;

fig. 9 is an enlarged schematic view at a in fig. 1.

Detailed Description

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

As shown in fig. 1 to 9, 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 on 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 to prevent the reinforcing steel bar from being deformed and recovered. The device also comprises a bracket 5 which is slidably arranged on the machine body 1, the bracket 5 is annular and is matched with the machine body 1, and a supporting wheel 5a which is convenient for propping against the inner wall of the machine body 1 is also arranged on the bracket 5. The device comprises a bracket 5, wherein the bracket 5 is provided with a driver 3 and an assembly space 5b, the driver 3 comprises a second driving mechanism 31 for driving the tension nut 2 to rotate, a transmission gear 33 which is linked with the second driving mechanism 31 and meshed with the tension nut 2, and a third driving mechanism 32 which can push the transmission gear 33 to slidingly mesh with the tension nut 2, the tension nut 2 is also provided with a baffle edge 21 which can abut against the transmission gear 33 and drive the whole driver 3 to slide along with the tension nut 2 towards the direction of a fixed end plate 122, when the tension nut 2 moves away from the fixed end plate 122, the tension nut 2 abuts against the bracket 5 and enables the driver 3 to synchronously move along with the tension nut 2, and when the tension nut 2 moves towards the direction close to the fixed end plate 122, the tension nut 2 abuts against the transmission gear 33 and enables the driver to synchronously move along with the tension nut 2. In the tensioning process, the tensioning large nut 2 firstly moves along the tensioning screw rod 121 in the direction away from the fixed end plate 122, the support 5 abuts against the back surface of the Zhang Lada nut 2, the driver 3 arranged on the support 5 can move along with the tensioning large nut 2 in the process that the tensioning large nut 2 moves in the direction away from the fixed end plate 122, further the driver 3 is guaranteed to be positioned at the same starting point with the driver 3 when the tensioning large nut 2 starts to rotate in the direction of the fixed end plate 122, meanwhile, the driver 3 abuts against the tensioning large nut 2 to keep up the design of the follow-up of the flange 21 in the direction of the fixed end plate 122, the tensioning effect of rotation of the tensioning large nut 2 and axial follow-up of the driver 3 and the large nut 2 can be achieved through only one driving step, the structure is simple and reasonable, design is ingenious, meanwhile, front-back displacement difference cannot occur due to the cooperation of the flange 21 and the driver 3, the degree of synchronization is very high, and the clamping effect of the tensioning large nut 2 can be further guaranteed.

As shown in fig. 3, 4 and 8, in this embodiment, a sliding rail 13 matched with the large tensioning nut 2 is disposed in the bracket 5, the driver 3 can slide reciprocally relative to the sliding rail 13 to disengage or mesh the transmission gear 33 with the large tensioning nut 2, a chute 7 is formed on the machine body 1 to facilitate sliding of the driver 3 along with the large tensioning nut 2 along the axial direction of the machine body 1, and when the driver 3 drives the transmission gear 33 to approach the large tensioning nut 2, the driver moves in the chute 7 along the radial direction of the machine body 1; when the driver 3 starts to drive the tensioning nut 2 to rotate in the meshed state of the transmission gear 33 and the tensioning nut 2, the blocking edge 21 is abutted against the transmission gear 33, and the transmission gear 33 is connected to the driver 3, so that after the tensioning nut 2 generates axial displacement, the blocking edge 21 abutted against the transmission gear 33 pushes the transmission gear 33 in the axial direction, and thus the whole driver 3 is driven to generate axial displacement, the follow-up of the driver 3 and the tensioning nut 2 is realized, and the axial movement of the driver 3 is completed in the chute 7.

The driver 3 in this embodiment further includes a fixing frame 34 and a slider 35 disposed on the fixing frame 34, the second driving mechanism 31 is disposed on the slider 35, the third driving mechanism 32 is disposed on the fixing frame 34, an output end of the third driving mechanism 32 is connected with one end of the slider 35, a transmission gear 33 disposed at the other end of the slider 35 is further disposed on the slider 35, a first driving wheel 3a connected with an output shaft of the second driving mechanism 31 is further coaxially connected with the transmission gear 33, the first driving wheel 3a and the second driving wheel 3b are connected by a sprocket and a chain, or the first driving wheel 3a and the second driving wheel 3b are connected by a gear and are meshed by a gear set.

The third driving mechanism 32 is provided to push the second driving mechanism 31 and the transmission gear 33 provided on the slider 35 and capable of driving the tension nut 2 to rotate together to approach the tension nut 2, and finally, to achieve a state in which the transmission gear 33 is engaged with the tension nut 2. The second driving wheel 3b and the first driving wheel 3a can be directly meshed through a gear set, the distance between the second driving wheel 3b and the first driving wheel 3a can be adjusted according to the actual production condition, and when the distance between the second driving wheel and the first driving wheel is large, the second driving wheel can be connected in a transmission mode such as a belt or a chain, and finally, the power of the second driving mechanism 31 is transmitted to the tensioning large nut 2.

As shown in fig. 1, 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, a connecting shaft 42 is accommodated 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.

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.

As shown in fig. 1 and 9, in this embodiment, a clamping mechanism 6 is further disposed in the machine body 1, the clamping mechanism 6 includes a taper sleeve 61 and a claw 62 disposed along a circumferential direction of the connecting shaft 42 and slidably connected with the taper sleeve 61, the taper sleeve 61 can drive the claw 62 under the driving of the connecting shaft cylinder 112 to make the connecting shaft 42 and the tensioning screw 121 prop against and link with each other in a process of tensioning the steel bar, the claw 62 has a first clamping leg 621 and a second clamping leg 622 disposed at intervals, a clamping space 6a for accommodating and limiting the clamping block 124 and further limiting the axial movement of the connecting 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 a tail portion of the connecting shaft 42, and the setting of the clamping mechanism 6 can ensure the connection strength of the connecting shaft 42 and the tensioning screw 121, 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.

After tensioning is completed, the tensioning cylinder 111 keeps oil pressure, at this time, the third driving mechanism 32 starts to work, the driving gear 33 and the second driving mechanism 31 are pushed together to a state that the driving gear 33 is meshed with the tensioning large nut 2 through the sliding block 35, then the second driving mechanism 31 works, the tensioning large nut 2 moves towards the direction of the fixed end plate 122 through the cooperation of the second driving wheel 3b and the first driving wheel 3a, at this time, the blocking edge 21 on the tensioning large nut 2 abuts against the driving gear 33 in the radial direction, and therefore the sliding block 35, the sliding rail 13 and the bracket 5 provided with the driving gear 33 can synchronously move along with the tensioning large nut 2, and therefore the second driving mechanism 31 can continuously screw the tensioning large nut 2 to clamp the fixed end plate 122 finally, and further the deformation of the reinforcing steel bars is blocked.

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 (9)

1. The utility model provides a reinforcing bar prestressing force stretch-draw machine, includes fuselage (1), fuselage (1) are provided with first actuating mechanism (11), its characterized in that: the device comprises a frame (5) which is arranged on a frame (1) in a sliding manner, wherein a driver (3) and an assembling space (5 b) are arranged on the frame (5), the driver (3) comprises a second driving mechanism (31) which is used for driving the tension nut (2) to rotate, a transmission gear (33) which is linked with the second driving mechanism (31) and is meshed with the tension nut (2), and a third driving mechanism (32) which can push the transmission gear (33) to be in sliding engagement with the tension nut (2), when the tension nut (2) moves away from a fixed end plate (122), the tension nut (2) is propped against the frame (5) and enables the driver (3) to synchronously move along with the tension nut (2), and when the tension nut (2) moves towards the direction close to the fixed end plate (122), the tension nut (2) is propped against the transmission gear (33) and enables the driver to synchronously move along with the tension nut (2);

the support (5) is internally provided with a sliding rail (13) matched with the tensioning large nut (2), the driver (3) can slide back and forth relative to the sliding rail (13) to enable the transmission gear (33) to be separated from or meshed with the tensioning large nut (2), and the blocking edge (21) on the tensioning large nut (2) can be abutted against the transmission gear (33) under the meshing state of the transmission gear (33) and the tensioning large nut (2).

2. The reinforcing bar prestress tensioning machine of claim 1, wherein: the driver (3) further comprises a fixing frame (34) and a sliding block (35) arranged on the fixing frame (34), the second driving mechanism (31) is arranged on the sliding block (35), the third driving mechanism (32) is arranged on the fixing frame (34), the output end of the third driving mechanism (32) is connected with one end of the sliding block (35), and the other end of the sliding block (35) is provided with a transmission gear (33).

3. The reinforcing bar prestress tensioner as set forth in claim 2, wherein: the sliding block (35) is further provided with a first driving wheel (3 a) connected with an output shaft of the second driving mechanism (31), the driving gear (33) is coaxially connected with a second driving wheel (3 b), the first driving wheel (3 a) and the second driving wheel (3 b) are connected through a chain by adopting chain wheels, or the first driving wheel (3 a) and the second driving wheel (3 b) are connected through gears in a meshed mode by a gear set.

4. A bar prestress tensioner according to any one of claims 1 to 3, characterized in that: the machine body (1) is provided with a chute (7) which is convenient for the driver (3) to slide along the axial direction of the machine body (1) along with the large tensioning nut (2).

5. The reinforcing bar prestress tensioning machine of claim 1, 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 blocked on a fixed end plate (122) 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).

6. The reinforcing bar prestress tensioning machine of claim 5, 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).

7. The reinforcing bar prestress tensioning machine of claim 6, 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.

8. The reinforcing bar prestress tensioning machine of claim 7, 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).

9. The reinforcing bar prestress tensioning machine of claim 1, wherein: the support (5) is annular and is matched with the machine body (1), and the support (5) is also provided with a supporting wheel (5 a) which is convenient to prop against the inner wall of the machine body (1).