Tensioning machine for prestressed sleeper production

Abstract

The utility model discloses a tensioning machine for prestressed sleeper production, which comprises a case, and a tensioning mechanism is arranged on the case. The tensioning mechanism comprises a tensioning rod arranged on the machine box in a penetrating mode and a second hydraulic cylinder arranged on one side of the machine box and used for applying pulling force to the outer end of the tensioning rod, and the inner end of the tensioning rod is detachably connected with an in-mold steel bar tensioning screw. The tensioning mechanism is used for tensioning the steel bar, the tension is measured through a pressure sensor on the tensioning mechanism, and after the process requirement is met, the mold nut tightening mechanism screws a nut through a sleeve to lock a steel bar tensioning screw in the tensioned mold, so that the steel bar is prevented from retracting. Therefore, the steel bar pulling device does not need to apply pulling force to the steel bar by using an electric wrench to screw a nut, so that the efficiency is higher, and the labor intensity of operators is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sleeper production machinery, in particular to a tensioning machine for prestressed sleeper production. Background Art

[0002] The prestressed concrete sleeper is a sleeper that replaces the material with concrete and applies prestress on the basis of a wooden sleeper. At the present stage, China's railway construction industry is in a period of rapid development. Strengthening the research on the production process of prestressed concrete sleepers during this period is not only beneficial to improving the durability of the concrete sleeper structure, but also has a very positive promoting significance for extending the service life of the sleeper.

[0003] At present, in the production of concrete prestressed sleepers, before pouring concrete into a steel mold, it is necessary to apply tension to the steel bars in the mold to generate a certain prestress in the steel bars, and then pour concrete into the mold.

[0004] Currently, the direct tensioning method is usually adopted, that is, a hydraulic wrench or a method of driving a speed reducer by a motor is used to directly turn the nut, and the steel bar is pulled under the action of the thread. Therefore, a very large torque value is required. The speed of an ordinary hydraulic wrench is extremely slow, and it is very difficult to keep the tension uniform. The working efficiency is low and the labor intensity is very high. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a tensioning machine for prestressed sleeper production, which is used to solve the problems of low efficiency and high labor intensity during the tensioning of steel bars in the production of concrete prestressed sleepers at present.

[0006] To solve the above technical problem, the technical solution adopted by the utility model is:

[0007] A tensioning machine for prestressed sleeper production includes a machine case, and a tensioning mechanism is arranged on the machine case; the tensioning mechanism includes a tensioning rod penetrating through the machine case, and a second hydraulic cylinder arranged on one side of the machine case for applying tension to the outer end of the tensioning rod. The tensioning rod is coaxial with the steel bar of the sleeper, and the inner end of the tensioning rod is detachably connected to the steel bar.

[0008] Furthermore, the cylinder body of the second hydraulic cylinder is a cylindrical shape sleeved on the tensioning rod, and the cylinder body is fixedly connected to the machine case. An annular closed oil chamber is formed between the inner wall and the outer wall of the second hydraulic cylinder. The piston of the second hydraulic cylinder is annular and is arranged in the oil chamber. A lock nut is screwed on the outer end of the tensioning rod. A pressure sensor is fixedly connected to the piston. The pressure sensor is sleeved on the tensioning rod and is clamped between the lock nut and the piston.

[0009] Furthermore, the end of the steel bar is a first connecting head with a diameter larger than the outer diameter of the steel bar, the corresponding end of the tension rod and the steel bar is a second connecting head with a diameter larger than the diameter of the tension rod, a hollow connecting plug is sleeved on the first connecting head and the second connecting head, both the first connecting head and the second connecting head are located inside the connecting plug, the connecting plug is provided with notches on the side walls corresponding to the steel bar and the tension rod, the steel bar and the tension rod are respectively located in the corresponding notches, and the notches are communicated with the lower surface of the connecting plug.

[0010] Furthermore, a sliding box is provided on the chassis, the connecting plug is vertically slidably connected in the sliding box, and a first hydraulic cylinder for driving the connecting plug to slide up and down in the sliding box is provided on the sliding box; the sliding box is slidably connected with the chassis, and the sliding direction of the sliding box is consistent with the axial direction of the tension rod.

[0011] Furthermore, a mold nut tightening mechanism is provided between the tensioning mechanism and the mold of the sleeper on the chassis, the mold nut tightening mechanism includes a box body fixedly connected to the chassis, a sleeve sleeved on the steel bar, and a hydraulic motor fixedly connected to the box body for driving the sleeve to rotate, and the sleeve is in clearance fit with the steel bar.

[0012] Furthermore, a driven gear is sleeved on the sleeve, the driven gear is in transmission connection with the sleeve, the driven gear is located inside the box body, the driven gear is coaxial with the sleeve, and a driving gear meshing with the driven gear is provided inside the box body, and the driving gear is fixedly connected to the output shaft of the hydraulic motor.

[0013] Furthermore, a second spring for applying a thrust force towards the mold direction to the sleeve is provided between the sleeve and the box body.

[0014] Furthermore, tracks are laid under the chassis, and a traveling crane capable of traveling along the tracks is provided on the tracks, and the traveling crane is connected to the chassis.

[0015] Furthermore, a linear slide table in the same direction as the tension rod is provided between the chassis and the flat car, and a first spring is provided between the linear slide table and the box body.

[0016] The positive effects of the present utility model are:

[0017] The utility model is provided with a die nut tightening mechanism and a tensioning mechanism. The tensioning mechanism tensions the steel bar tensioning screw in the die through a second hydraulic cylinder, and then tensions multiple steel bars connected to the steel bar tensioning screw in the die. The tension during tensioning is measured by a pressure sensor. After reaching the process requirements, the die nut tightening mechanism screws the nut through a sleeve to lock the steel bar tensioning screw in the die and prevent the steel bars from retracting. Therefore, the utility model does not need to apply tension to the steel bars by using an electric wrench to screw the nut, so the efficiency is higher and the labor intensity of the operator is reduced. At the same time, the tension during tensioning can be measured by the pressure sensor, so the tension of each steel bar can be ensured to be uniform, which is beneficial to ensuring the product quality of the subsequent produced sleepers. The tensioning rod and the steel bar tensioning screw in the die are quickly connected and separated through a connecting plug-in, and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a side view of the utility model;

[0019] Figure 2 is Figure 1 the left view of

[0020] Figure 3 is Figure 1 the top view of

[0021] Figure 4 is the working drawing after the first connector is connected to the second connector;

[0022] Figure 5 is the working drawing after the first connector is separated from the second connector

[0023] 1. Rail; 2. Traveling crane; 3. Linear slide; 4. Die nut tightening mechanism; 5. Tensioning mechanism; 6. Chassis; 7. Steel bar tensioning screw in die; 8. Guide block; 9. Sleeve; 10. Second spring; 11. Driven gear; 12. Driving gear; 13. Hydraulic motor; 14. Box body; 15. Slide box; 16. First hydraulic cylinder; 17. Lug; 18. First connector; 19. Connecting plug-in; 20. Second hydraulic cylinder; 21. Pressure sensor; 22. Lock nut; 23. Tensioning rod; 24. Window; 25. Slide groove; 26. Support frame; 27. Second connector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Embodiment 1

[0025] As Figures 1 to 5As shown in the figure, a tensioning machine for the production of prestressed sleepers includes a machine case 6. A die nut tightening mechanism 4 and a tensioning mechanism 5 are successively arranged on the machine case 6 from left to right. The tensioning mechanism 5 includes a tensioning rod 23 penetrating through the right side of the machine case 6 and a second hydraulic cylinder 20 arranged on the right side of the machine case 6 for applying a pulling force to the right end of the tensioning rod 23. The left end of the tensioning rod 23 is detachably connected with a steel bar tensioning screw rod 7 inside the die. The steel bar tensioning screw rod 7 inside the die is connected with multiple steel bars inside the die.

[0026] The cylinder body of the second hydraulic cylinder 20 is a cylindrical shape sleeved outside the tensioning rod 23, and this cylinder body is fixedly connected with the right surface of the machine case 6. An annular closed oil chamber is formed between the inner wall and the outer wall of the second hydraulic cylinder 20. The piston of the second hydraulic cylinder 20 is annular, and this piston is arranged inside the oil chamber. Oil pipes are connected to the cylinder body at positions corresponding to both ends of the oil chamber for injecting hydraulic oil into the oil chamber. A lock nut 22 is screwed near the right end of the tensioning rod 23. The right end of the piston is fixedly connected with a pressure sensor 21. The pressure sensor 21 is sleeved on the tensioning rod 23, and the pressure sensor 21 is clamped between the lock nut 22 and the piston.

[0027] The die nut tightening mechanism 4 includes a box body 14 fixedly connected to the left side of the machine case 6, a sleeve 9 sleeved on the steel bar tensioning screw rod 7 inside the die, and a hydraulic motor 13 fixedly connected to the box body 14 for driving the sleeve 9 to rotate. The sleeve 9 has a clearance fit with the steel bar tensioning screw rod 7 inside the die.

[0028] A driven gear 11 is sleeved on the right end of the sleeve 9. The right end of the driven gear 11 and the sleeve 9 are in spline transmission connection. The driven gear 11 is located inside the box body 14. The driven gear 11 and the sleeve 9 are coaxial. A driving gear 12 meshing with the driven gear 11 is arranged inside the box body 14. The driving gear 12 is fixedly connected with the output shaft of the hydraulic motor 13. A second spring 10 is arranged between the right side of the sleeve 9 and the box body 14, so that the thrust applied by the second spring 10 to the sleeve 9 is towards the left in the direction of the die. Three guiding blocks 8 surrounding the circumferential direction of the sleeve 9 are also fixedly connected to the left side of the box body 14 for supporting and guiding the sleeve 9.

[0029] The working process of the present utility model is as follows:

[0030] 1. The left side of the machine case 6 is the die. Multiple steel bars inside the die are connected with the left end of the steel bar tensioning screw rod 7 inside the die. The steel bar tensioning screw rod 7 inside the die passes through the sleeve 9 and is then connected with the left end of the tensioning rod 23. The lock nut 22 is screwed to make the left end face of the machine case 6 closely attached to the die.

[0031] 2. The second hydraulic cylinder 20 operates to pull the tensioning rod 23 to the right, and further applies a rightward pulling force to the steel bar tensioning screw rod 7 inside the die through the tensioning rod 23, thereby applying prestress to each steel bar.

[0032] 3. When the pressure sensor 22 detects that the tensile force applied to the steel bar reaches the process requirement value, the hydraulic motor 13 drives the driven gear 11 to rotate through the driving gear 12, and then drives the sleeve 9 to rotate through the driven gear 11, tightening the nut in the sleeve 9, thereby locking the position of the steel bar tensioning screw 7 in the mold, preventing the steel bar tensioning screw 7 in the mold from moving leftward after separating from the tensioning rod 23, so that the steel bar loses tensile force.

[0033] 4. Separate the steel bar tensioning screw 7 in the mold from the tensioning rod 23.

[0034] Both the tensioning mechanism 5 and the mold nut tightening mechanism 4 are provided with two groups, so the utility model can simultaneously tension two steel bar tensioning screws 7 in the mold.

[0035] The utility model uses the second hydraulic cylinder 20 to tension the steel bar through the steel bar tensioning screw 7 in the mold, and locks the steel bar tensioning screw 7 in the mold through the sleeve 9, without using an electric wrench to apply tensile force to the steel bar by screwing the nut, so the efficiency is higher and the labor intensity of the operator is reduced. At the same time, the tensile force during tensioning can be measured by the pressure sensor 22, so the tensile force of the steel bar can be ensured to be uniform, which is beneficial to ensuring the product quality of the subsequent produced sleeper.

[0036] Embodiment 2

[0037] The difference between this embodiment and Embodiment 1 is as follows:

[0038] The right end of the steel bar tensioning screw 7 in the mold is a cylindrical first connecting head 18 with a diameter larger than the outer diameter of the steel bar tensioning screw 7 in the mold, and the left end of the tensioning rod 23 is a cylindrical second connecting head 27 with a diameter larger than the diameter of the tensioning rod 23. A hollow connecting plug-in 19 is covered on the first connecting head 18 and the second connecting head 27, and the connecting plug-in 19 is in the shape of a rectangular box with an open bottom. Both the first connecting head 18 and the second connecting head 27 are located in the connecting plug-in 19. Vertical slits 28 are provided on the side walls on the left and right sides of the connecting plug-in 19. The steel bar tensioning screw 7 in the mold and the tensioning rod 23 are respectively located in the corresponding slits 28, and the slits 28 communicate with the bottom of the connecting plug-in 19.

[0039] A rectangular sliding box 15 with an open bottom is provided on the top of the chassis 6. The connecting plug-in 19 is vertically slidably connected in the sliding box 15. A vertical first hydraulic cylinder 16 is fixedly connected through the top of the sliding box 15. The push rod of the first hydraulic cylinder 16 faces downward. A lug 17 is fixedly connected to the top surface of the connecting plug-in 19. The bottom end of the push rod of the first hydraulic cylinder 16 is rotatably connected to the lug 17. When the first hydraulic cylinder 16 operates, it drives the connecting plug-in 19 to move up and down in the sliding box 15.

[0040] A gantry-shaped support frame 26 is fixedly connected to the top of the chassis 6, and the upper part of the sliding box 15 is located inside the sliding box 15. Both the front and rear sides of the support frame 26 are provided with sliding grooves 25, which are consistent with the axial direction of the tension rod 23. Two sliding pins are slidably connected in each sliding groove 25, and the sliding pins are respectively fixedly connected to the corresponding side surfaces of the sliding box 15. A strip-shaped window 24 for the first hydraulic cylinder 16 to pass through is provided at the top of the support frame 26.

[0041] As Figure 5 shown, the right side wall of the connecting plug-in 19 is lower than its left side wall. After the first hydraulic cylinder 16 lifts the connecting plug-in 19 upward, the left side wall of the connecting plug-in 19 is disengaged from the inner steel bar tensioning screw 7, and the right side wall of the connecting plug-in 19 slides upward along the annular groove on the right side of the second connecting head 27, and the right side wall of the connecting plug-in 19 does not disengage from the annular groove. Therefore, when the second hydraulic cylinder 20 operates, the connecting plug-in 19 and the sliding box 15 can be driven to move along the axial direction of the tension rod 23 through the tension rod 23, facilitating the connection between the first connecting head 18 and the second connecting head 27.

[0042] The second hydraulic cylinder 20 drives the connecting plug-in 19 to move leftward, and the sliding box 15 slides leftward along the support frame 26. When the first connecting head 18 is located below the connecting plug-in 19, the first hydraulic cylinder 16 drives the connecting plug-in to move downward, so that the left side of the first connecting head 18 enters the notch 28 on the left side wall of the connecting plug-in 19 (as Figure 4 shown).

[0043] Therefore, in this embodiment, the rapid connection and separation of the inner steel bar tensioning screw 7 and the tension rod 23 in the mold are realized, and the connection is reliable.

[0044] Embodiment 3

[0045] The difference between this embodiment and Embodiment 2 is that:

[0046] The chassis 6 is laid with rails 1 below, and a traveling crane 2 that can travel along the rails 1 is provided on the rails 1. The structure of the traveling crane 2 is the same as that of the commonly used electric flat car in the existing workshop, and both are driven by a motor to drive the wheels to rotate to realize walking on the rails 1. The direction of the rails 1 is consistent with the direction of the tension rod 23. A linear slide table 3 is connected to the top of the traveling crane 2, and the linear slide table 3 is a lead screw linear slide table. The slide seat of the linear slide table 3 is connected to the traveling crane 2, and a flat plate is fixedly connected to the top of the slider of the linear slide table 3. First springs are evenly distributed between the flat plate and the bottom of the chassis 6.

[0047] A vertical lead screw is provided between the linear slide 3 and the traveling crane 2. The bottom of the lead screw is fixedly connected to the traveling crane 2, and the upper part of the lead screw 2 is connected to the linear slide 3 through two nuts clamped at the bottom of the linear slide 3, so that the distance between the linear slide 3 and the traveling crane 2 can be adjusted.

[0048] The traveling crane 2 moves quickly on the track 1, so that the present utility model can quickly approach the mold. Then, the position of the chassis 6 is finely adjusted through the linear slide 3. The first spring plays a buffering role in the vibration during the tensioning process and compensates for a small offset of the chassis 6.

[0049] The above-described embodiments are described in detail and specifically, expressing the preferred embodiments of the present utility model. It is only used to illustrate the technical ideas and features of the present utility model. Its purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. However, it is not limited to the present utility model only. The patent scope of the present utility model cannot be limited only by this embodiment. That is, any equivalent changes or modifications made in accordance with the spirit disclosed by the present utility model, for researchers or technicians in the field, within the structure of the present utility model, local improvements within the system and changes and transformations between subsystems are still within the patent scope of the present utility model.

Claims

1. A tensioning machine for producing prestressed sleepers, characterized in that: The invention comprises a chassis (6), wherein a tensioning mechanism (5) is provided on the chassis (6); the tensioning mechanism (5) comprises a tensioning rod (23) penetrating the chassis (6), and a second hydraulic cylinder (20) provided on one side of the chassis (6) for applying tension to the outer end of the tensioning rod (23); the tensioning rod (23) is detachably connected to a steel bar tensioning screw (7) in a mold; the steel bar tensioning screw (7) in the mold is used to be connected to the steel bar in the mold; the tensioning rod (23) is coaxial with the steel bar tensioning screw (7) in the mold.

2. A tensioning machine for producing prestressed sleepers according to claim 1, characterized in that: The cylinder body of the second hydraulic cylinder (20) is cylindrical and is sleeved outside the tension rod (23). The cylinder body is fixedly connected to the chassis (6). An annular closed oil chamber is formed between the inner wall and the outer wall of the second hydraulic cylinder (20). The piston of the second hydraulic cylinder (20) is annular and is arranged in the oil chamber. A lock nut (22) is screwed onto the outer end of the tension rod (23). A pressure sensor (21) is fixedly connected to the piston. The pressure sensor (21) is sleeved on the tension rod (23). The pressure sensor (21) is clamped between the lock nut (22) and the piston.

3. A tensioning machine for producing prestressed sleepers according to claim 1, characterized in that: The end of the in-mould steel bar tensioning screw (7) is a first connector (18) whose diameter is larger than the outer diameter of the in-mould steel bar tensioning screw (7); the end of the tensioning rod (23) corresponding to the in-mould steel bar tensioning screw (7) is a second connector (27) whose diameter is larger than the diameter of the tensioning rod (23); the first connector (18) and the second connector (27) are covered with a hollow connecting plug (19); the first connector (18) and the second connector (27) are both located in the connecting plug (19); the connecting plug (19) is provided with notches (28) on the side walls corresponding to the in-mould steel bar tensioning screw (7) and the tensioning rod (23); the in-mould steel bar tensioning screw (7) and the tensioning rod (23) are respectively located in the corresponding notches (28); and the notches (28) are both communicated with the bottom of the connecting plug (19).

4. A tensioning machine for producing prestressed sleepers according to claim 3, characterized in that: The chassis (6) is provided with a sliding box (15), the connecting plug (19) is vertically slidably connected in the sliding box (15), and the sliding box (15) is provided with a first hydraulic cylinder (16) for driving the connecting plug (19) to slide up and down in the sliding box (15); the sliding box (15) is slidably connected to the chassis (6), and the sliding direction of the sliding box (15) is consistent with the axial direction of the tension rod (23).

5. A tensioning machine for producing prestressed sleepers according to claim 1, characterized in that: A mold nut tightening mechanism is provided on the chassis (6) between the tensioning mechanism (5) and the sleeper mold. The mold nut tightening mechanism (4) comprises a box body (14) fixedly connected to the chassis (6), a sleeve (9) sleeved on a steel bar tensioning screw (7) in the mold, and a hydraulic motor (13) fixedly connected to the box body (14) for driving the sleeve (9) to rotate. The sleeve (9) is clearance-matched with the steel bar tensioning screw (7) in the mold.

6. A tensioning machine for producing prestressed sleepers according to claim 5, characterized in that: A driven gear (11) is sleeved on the sleeve (9), the driven gear (11) and the sleeve (9) are transmission-connected, the driven gear (11) is located in a box (14), the driven gear (11) and the sleeve (9) are coaxial, a driving gear (12) meshing with the driven gear (11) is arranged in the box (14), and the driving gear (12) is fixedly connected to the output shaft of a hydraulic motor (13).

7. A tensioning machine for producing prestressed sleepers according to claim 6, characterized in that: A second spring (10) is provided between the sleeve (9) and the box body (14) for applying a thrust to the sleeve (9) in the direction of the mold.

8. A tensioning machine for producing prestressed sleepers according to claim 1, characterized in that: A track (1) is laid below the chassis (6), and a trolley (2) that can move along the track (1) is provided on the track (1), and the trolley (2) is connected to the chassis (6).

9. A tensioning machine for producing prestressed sleepers according to claim 8, characterized in that: A linear slide (3) in the same direction as the tension rod (23) is provided between the chassis (6) and the flat car, and a first spring is provided between the linear slide (3) and the box body (14).

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