A prestressed sleeper tensioning machine

Abstract

The present invention discloses a prestressed sleeper tensioning machine, which includes a tensioning machine frame. A tensioning frame capable of moving up and down, left and right, and front and back is connected to the tensioning machine frame. A nut driving frame and a screw joint head are sequentially arranged from front to back and connected to the tensioning frame. A tensioning power mechanism for driving the screw joint head to move backward is connected to the tensioning frame. A nut joint head capable of cooperating with the screw nut on the sleeper mold is rotatably connected to the nut driving frame. A nut driving mechanism for driving the nut joint head to rotate is installed on the nut driving frame. The screw joint head includes an end nut screwed to the end of the screw on the sleeper mold. A nut clamping head capable of clamping the end nut is slidably connected to the tensioning frame. The present invention can quickly and accurately make the tensioning joint head clamp the end of the tensioning rod to achieve tensioning, and has the advantages of ensuring the tensioning quality, being applicable to the production of various sleepers, effectively ensuring the production quality of sleepers, and improving labor efficiency.

Description

Technical Field

[0001] The present invention relates to a prestressed sleeper tensioning machine. Background Art

[0002] At present, during the production process of CRTS III-type sleepers (prestressed concrete sleepers or prestressed sleepers), the steel bars embedded in the sleepers need to be tensioned, so that prestress is generated in the steel bars. Then, concrete is poured into the mold and vibrated. After steam curing, the tension is released, the mold is disassembled, and the demolding is completed, thus completing the production of prestressed sleepers.

[0003] During the process of steel bar tensioning, a tensioning machine is required to tension the steel bars so that the steel bars have a certain prestress. In the prior art, the longitudinal steel bars of the sleeper should adopt the single-end single-bar simultaneous tensioning method and be controlled by the single-bar tension value. After tensioning, it should be locked. A prestressed track slab steel bar tensioning machine is disclosed in the Chinese invention patent with the patent application number 2018101969561. According to the existing prestressed track slab mold, corresponding coupling heads are arranged on the tensioning machine, and the coupling heads are used to combine with the special-shaped nuts on the track slab mold, thus realizing the function of single-bar tensioning. In other prior arts, the combination of the coupling head and the special-shaped nut is also used for combination, and then the tensioning power machine is used to pull, realizing the tensioning of the steel bars (generating prestress). Now, in order to improve efficiency, a prestressed sleeper mold is proposed, on which the above-mentioned special-shaped end nuts are no longer fixedly arranged, that is, the use of the cooperation between the coupling head and the special-shaped nut for tensioning cannot be realized on the sleeper mold. The existing tensioning machine can no longer achieve quick and accurate clamping, so the labor efficiency is low, and the tensioning process in the production process of prestressed sleepers cannot be realized. Secondly, according to the different specifications and requirements of prestressed sleepers, the widths of multiple steel bars in the prestressed sleepers will be different, and the position of the tensioning coupling head needs to be adjusted. The existing tensioning machine is time-consuming and laborious to adjust and cannot meet the production requirements of various prestressed sleepers. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a prestressed sleeper tensioning machine that can quickly and accurately clamp the end of the mold screw rod and is applicable to the production of prestressed sleepers of different specifications in view of the above defects.

[0005] To solve the above technical problems, the provided prestressed sleeper tensioning machine includes a tensioning machine frame, and a tensioning frame capable of moving up and down, left and right, and back and forth is connected to the tensioning machine frame. Its structural characteristics are as follows: A nut driving frame and a screw joint are sequentially arranged on the tensioning frame from front to back. A tensioning power mechanism for driving the screw joint to move backward is connected to the tensioning frame. A nut joint capable of cooperating with the screw nut on the sleeper mold is rotatably connected to the nut driving frame. A nut driving mechanism for driving the nut joint to rotate is installed on the nut driving frame. The screw joint includes an end nut screwed to the end of the screw on the sleeper mold. A nut clamping head capable of clamping the end nut is slidably connected to the tensioning frame.

[0006] The tensioning power mechanism includes a tensioning oil cylinder connected to the tensioning frame. The screw joint is slidably connected to the tensioning frame. The piston rod of the tensioning oil cylinder is hinged to the screw joint. A detection device for detecting the extension length of the piston rod and the tensioning force of the tensioning oil cylinder is installed on the tensioning oil cylinder.

[0007] The nut clamping head includes a clamping frame connected to the tensioning frame. Two oppositely arranged clamping plates are slidably connected to the clamping frame. A clamping power mechanism for driving the two clamping plates to move relative to each other is connected to the tensioning frame.

[0008] The clamping power mechanism includes a clamping air cylinder connected to the clamping frame. A main driving arm slidably engaged with the clamping frame is connected to one of the clamping plates. A driven driving arm slidably engaged with the clamping frame is installed on the other clamping plate. The main driving arm is power-connected to the piston rod of the clamping air cylinder. A clamping gear is installed on the clamping frame. Rack teeth that simultaneously mesh with the clamping gear are correspondingly provided on the main driving arm and the driven driving arm.

[0009] The nut driving mechanism includes a nut driving servo motor connected to the nut driving frame. A main driving gear is power-connected to the power output shaft of the nut driving servo motor. A driven gear meshing with the main driving gear is also rotatably connected to the nut driving frame. The nut joint is a driving nut fixedly connected to the driven gear.

[0010] An outward-extending mounting shaft is fixedly connected to the driven gear. The mounting shaft is connected to the nut driving frame through a bearing.

[0011] The nut driving frame is slidably connected to the tensioning frame. A pushing pneumatic ejector rod for driving the nut driving frame to slide forward so that the nut joint cooperates with the screw nut is installed on the tensioning frame.

[0012] A prestressed positioning mechanism capable of positioning the screw on the tensioned sleeper mold is connected to the tensioning machine frame.

[0013] The prestress positioning mechanism includes a positioning frame connected to the tensioning frame. A positioning sliding frame capable of sliding back and forth is installed on the positioning frame. A downward pressing positioning head driven by a positioning cylinder to move up and down and a proximity switch for detecting the position of the screw on the sleeper mold are installed on the positioning sliding frame.

[0014] In summary, compared with the prior art, the above solution has the following advantages: The present invention can quickly and accurately make the tensioning joint clamp the end of the tensioning rod to achieve tensioning, and has the advantages of ensuring the tensioning quality, being applicable to the production of various sleepers, effectively ensuring the production quality of sleepers, and improving labor efficiency. Brief Description of the Drawings

[0015] The following further details the specific embodiments of the present invention with reference to the drawings:

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0017] Figure 2 is Figure 1 a schematic top view structural diagram;

[0018] Figure 3 is Figure 1 a schematic structural diagram of the nut driving frame in the embodiment;

[0019] Figure 4 is Figure 1 a schematic structural diagram of the clamping power mechanism and the screw joint in the embodiment;

[0020] Figure 5 is a schematic structural diagram of the existing sleeper mold;

[0021] Figure 6 is Figure 5 a schematic top view structural diagram. Detailed Description of the Specific Embodiments

[0022] As Figure 5 and Figure 6 shown, the existing sleeper mold includes a mold outer shell 100. Multiple sets of molds 101 are arranged inside the mold outer shell 100. A steel bar fixing seat 102 is arranged at one end of the mold 101, and a steel bar sliding seat 103 is arranged at the other end. The steel bar is connected between the steel bar fixing seat and the steel bar sliding seat 103. A screw 104 is installed on the steel bar sliding seat 103 and penetrates through the mold outer shell 100. The outer extending end of the screw 104 extends out of the mold outer shell 100, and a screw nut 105 is screwed on the outer extending end. This screw nut uses the nut in the prior art, and the tensioning machine in the prior art cannot pull it. Figure 5 and Figure 6 show that two sets of molds 101 are arranged in the schematic mold outer shell, and the screw 104 on one set of molds 101 has been tightened.

[0023] As Figure 1 and Figure 2 shown, the present invention provides an embodiment of a prestressed sleeper tensioning machine. For convenience of description, the left - right direction in Figure 1 is defined as the longitudinal direction of the machine, and the direction perpendicular to the paper surface is defined as the transverse direction of the machine. It includes a tensioning frame 1, and a tensioning frame 2 that can move up - down, left - right, and front - back is connected to the tensioning frame 1. Specifically, it can include three - layer frames. The bottom frame is slidably connected to the tensioning frame 1 and can slide longitudinally along the tensioning frame 1. A bottom oil cylinder 23 can be connected to the tensioning frame 1, and the piston rod of the bottom oil cylinder 23 is power - connected to the bottom frame. A vertically telescopic ejector rod can be installed on the bottom frame. Of course, an oil cylinder can also be used instead of the ejector rod. Since the height of the sleeper mold generally does not change, using the ejector rod can achieve the purpose. The vertically telescopic ejector rod can be realized by the structure of a screw rod screwed with a nut. Its specific structure is prior art. The top of the ejector rod is connected to the middle frame. The middle frame is slidably connected to the top frame that can slide horizontally. The horizontal sliding of the top frame can adopt a driving mechanism of a lead screw and a nut. For example, a horizontally arranged lead screw is rotatably connected to the middle frame. The lead screw can be driven by a handwheel. Of course, it can also be driven by a motor. A nut that can be screwed with the lead screw is rotatably connected to the above - mentioned top frame. When the lead screw rotates, the nut drives the top frame to achieve horizontal sliding. The adjustment of the top frame is relatively frequent because the above - mentioned sleeper mold is transported through a conveyor line, and it is very difficult to achieve very precise accuracy when it reaches the tensioning station. Therefore, the top frame needs to be adjusted frequently. The above - mentioned tensioning frame can be fixedly connected to the top frame. Of course, the tensioning frame 2 and the top frame can be an integral structure.

[0024] Refer to Figures 1 to 4As shown, a nut driving frame 3 and a screw joint 4 are sequentially arranged from front to back and connected to the tensioning frame 2. A tensioning power mechanism for driving the screw joint 4 to move backward is connected to the tensioning frame 2. A nut joint 5 capable of cooperating with the screw nut on the sleeper mold is rotatably connected to the nut driving frame 3. A nut driving mechanism for driving the nut joint 5 to rotate is installed on the nut driving frame 3. The nut driving mechanism includes a nut driving servo motor 13 connected to the nut driving frame. A main driving gear 14 is power-connected to the power output shaft of the nut driving servo motor. A driven gear 15 meshing with the main driving gear is also rotatably connected to the nut driving frame. The nut joint is a driving nut 16 fixedly connected to the driven gear. The cross-section of the outer surface of the above-mentioned screw nut is hexagonal, and the driving nut 16 has a cavity with an internal hexagonal cross-section, and the screw nut will be exactly located in the driving nut. An extended mounting shaft 17 is fixedly connected to the driven gear, and the mounting shaft 17 is connected to the nut driving frame through a bearing. The nut driving frame 3 is slidably connected to the tensioning frame. A pushing pneumatic ejector rod 18 for driving the nut driving frame to slide forward so that the nut joint cooperates with the screw nut is installed on the tensioning frame. When tensioning is required, the above-mentioned tensioning frame reaches the working position through the movement of the three-layer frame. At this time, the entire nut driving frame 3 may be far away from the screw nut 105. Through the action of the above-mentioned pushing pneumatic ejector rod 18, the nut driving frame 3 is close to the screw nut 105, and during the entire tensioning process, through the pushing action of the above-mentioned pushing pneumatic ejector rod, the screw nut can always be in the driving nut 16.

[0025] Reference Figures 1 to 4As shown in the figure, the tensioning power mechanism includes a tensioning oil cylinder 6 connected to the tensioning frame 2. The screw joint head 4 is slidably connected to the tensioning frame 2. The piston rod of the tensioning oil cylinder 6 is hinged to the screw joint head 4. A detection device for detecting the extension length of the piston rod and the tensioning force of the tensioning oil cylinder is installed on the tensioning oil cylinder 6. This detection device includes a displacement sensor for detecting the sliding distance of the piston rod and a pressure sensor for detecting the pulling force of the tensioning oil cylinder. The specific structures and connection structures of the above displacement sensor and pressure sensor are all prior arts, so that the intensity and displacement of the tensioning can be accurately monitored, thus ensuring the tensioning quality. The screw joint head 4 includes an end nut screwed to the end of the screw of the sleeper mold. A nut clamping head capable of clamping the end nut is slidably connected to the tensioning frame 2. The nut clamping head includes a clamping frame 7 connected to the tensioning frame 2. Two relatively arranged clamping plates 8 are slidably connected to the clamping frame. A clamping power mechanism for driving the two clamping plates to move relative to each other is connected to the tensioning frame 2. The clamping power mechanism includes a clamping cylinder 9 connected to the clamping frame 7. A main driving arm 10 slidably engaged with the clamping frame is connected to one of the clamping plates 8. A slave driving arm 11 slidably engaged with the clamping frame is installed on the other clamping plate. The main driving arm 10 is power-connected to the piston rod of the clamping cylinder 9. A clamping gear 12 is installed on the clamping frame. Corresponding racks that are simultaneously engaged with the clamping gear are provided on the main driving arm and the slave driving arm. By the action of the clamping cylinder, the main driving arm drives one of the clamping plates 8 to move. Under the rotation action of the clamping gear, the two clamping plates approach each other and jointly clamp the end nut screwed to the end of the screw of the sleeper mold. In this embodiment, the rack is not installed separately, and tooth patterns are machined on the surfaces of the main driving arm and the slave driving arm to form the above-mentioned rack.

[0026] Reference Figure 1 and Figure 2 As shown in the figure, a prestress positioning mechanism capable of positioning the screw on the tensioned sleeper mold is connected to the tensioning machine frame 1. The prestress positioning mechanism includes a positioning frame 19 connected to the tensioning machine frame 1. A positioning sliding frame 20 capable of sliding back and forth is installed on the positioning frame 19. A downward pressing positioning head 21 driven by a positioning cylinder to move up and down and a proximity switch 22 for detecting the position of the screw on the sleeper mold are installed on the positioning sliding frame 20. After the tensioning is completed, the proximity switch 22 senses the position of the steel bar sliding seat 103 below, and by pushing the downward pressing positioning head 21, the steel bar sliding seat 103 is positioned to ensure that the steel bar is in a tension state. The sliding structure setting of the above positioning sliding frame 20 can enable the entire prestress positioning mechanism to adapt to the production of sleepers of different models.

[0027] The above is the specific structural form of the present invention. The present invention is not limited by the above embodiments. For those skilled in the art, equivalent changes and component replacements based on the specific structure of the present invention are all within the protection scope of the present invention.

Claims

1. A prestressed sleeper tensioning machine, comprising a tensioning machine frame (1), and a tensioning frame (2) which can move up and down, left and right, and back and forth is connected to the tensioning machine frame (1), and is characterized in that: A nut driving frame (3) and a screw joint head (4) are sequentially arranged from front to back and connected to the tensioning frame (2). A tensioning power mechanism for driving the screw joint head (4) to move backward is connected to the tensioning frame (2). A nut joint head (5) capable of cooperating with the screw nut on the sleeper mold is rotatably connected to the nut driving frame (3). A nut driving mechanism for driving the nut joint head (5) to rotate is installed on the nut driving frame (3). The screw joint head (4) includes an end nut screwed onto the end of the screw of the sleeper mold. A nut clamping head capable of clamping the end nut is slidably connected to the tensioning frame (2). The nut joint head is a driving nut (16) fixedly connected to the driven gear. The cross-section of the outer surface of the screw nut is hexagonal. The driving nut (16) has an inner hexagonal cross-section cavity, and the screw nut will be exactly located in the driving nut. The screw joint head (4) includes an end nut screwed onto the end of the screw of the sleeper mold. A nut clamping head capable of clamping the end nut is slidably connected to the tensioning frame (2). The nut clamping head includes a clamping frame (7) connected to the tensioning frame (2). Two oppositely arranged clamping plates (8) are slidably connected to the clamping frame. A clamping power mechanism for driving the two clamping plates to move relative to each other is connected to the tensioning frame (2). The clamping power mechanism includes a clamping cylinder (9) connected to the clamping frame (7). A main driving arm (10) slidably engaged with the clamping frame is connected to one of the clamping plates (8). A slave driving arm (11) slidably engaged with the clamping frame is installed on the other clamping plate. The main driving arm (10) is power-connected to the piston rod of the clamping cylinder (9). A clamping gear (12) is installed on the clamping frame. Rack teeth corresponding to each other and simultaneously meshing with the clamping gear are provided on the main driving arm and the slave driving arm. Through the action of the clamping cylinder, the main driving arm drives one of the clamping plates (8) to act. Under the rotation of the clamping gear, the two clamping plates approach each other and jointly clamp the end nut screwed onto the end of the screw of the sleeper mold.

2. The prestressed sleeper tensioning machine according to claim 1, characterized in that: The tensioning power mechanism includes a tensioning oil cylinder (6) connected to the tensioning frame (2). The screw joint head (4) is slidably connected to the tensioning frame. The piston rod of the tensioning oil cylinder (6) is hinged to the screw joint head (4). A detection device for detecting the extending length of the piston rod and the tensioning force of the tensioning oil cylinder is installed on the tensioning oil cylinder (6).

3. The prestressed sleeper tensioning machine according to claim 1 or 2, characterized in that: The nut driving mechanism includes a nut driving servo motor (13) connected to the nut driving frame (3). A main driving gear (14) is power-connected to the power output shaft of the nut driving servo motor. A driven gear (15) meshing with the main driving gear is also rotatably connected to the nut driving frame. The nut joint head is a driving nut (16) fixedly connected to the driven gear.

4. The prestressed sleeper tensioning machine according to claim 3, characterized in that: An outward-extending mounting shaft (17) is fixedly connected to the driven gear. The mounting shaft (17) is connected to the nut driving frame through a bearing.

5. The prestressed sleeper tensioning machine according to claim 1 or 2, characterized in that: The nut driving frame (3) is slidably connected to the tensioning frame. A pushing pneumatic ejector rod (18) for driving the nut driving frame to slide forward so that the nut joint head cooperates with the screw nut is installed on the tensioning frame.

6. The prestressed sleeper tensioning machine according to claim 1 or 2, characterized in that: A prestressed positioning mechanism capable of positioning the screw on the sleeper mold after tensioning is connected to the tensioning machine frame.

7. The prestressed sleeper tensioning machine according to claim 6, characterized in that: The prestressed positioning mechanism includes a positioning frame (19) connected to the tensioning machine frame. A positioning sliding frame (20) capable of sliding back and forth is installed on the positioning frame (19). A downward pressing positioning head (21) driven by a positioning cylinder to move up and down and a proximity switch (22) for detecting the position of the screw on the sleeper mold are installed on the positioning sliding frame (20).

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