A tensioning device for the production of prestressed materials applicable to railway sleepers

Abstract

The present invention relates to the technical field of material tensioning, and in particular to a tensioning device for the production of prestressed materials suitable for railway sleepers. It includes: a chassis, a moving frame is slidably connected to the chassis, and a first hydraulic push rod is installed on the moving frame; a connecting piece is rotatably connected to the telescopic end of the first hydraulic push rod, a housing is installed on the connecting piece, a transmission medium is filled in the housing, a sliding rod is slidably connected to the housing, and a first pipe and a second pipe are connected between the mirror-image arranged housings; a mold set is arranged on the chassis for forming materials; a limiting mechanism is arranged on the sliding rod for applying prestress to the mold set. The present invention connects the mirror-image arranged housings through the first pipe and the second pipe, so that the force exerted by the transmission medium in the housing on the sliding rod is uniform, and the limiting mechanism applies uniform prestress to the mold set, so that the preload applied to the sleeper is uniform.

Description

Technical Field

[0001] The invention relates to the technical field of material tensioning, and in particular to a tensioning device for producing prestressed materials suitable for rail sleepers. Background Art

[0002] Prestressed sleepers are a new type of sleeper structure that uses prestressed steel bars to enhance the bending and compressive properties of sleepers. Compared with traditional concrete sleepers, prestressed sleepers have higher bearing capacity, longer service life and better seismic resistance. Prestressed sleepers are widely used in railway projects, especially in the construction of high-speed railways and heavy-load railways. During the production process of prestressed sleepers, tensioning equipment is usually used to stretch the steel bars in the sleepers to give the steel bars an initial load (prestress treatment). The prestress can effectively offset the impact of external loads on concrete, thereby effectively improving the various properties of concrete sleepers.

[0003] When the existing prestressed sleepers are tensioned, the steel bars are only tensioned uniformly. However, since one sleeper mold can usually produce two sleepers at a time, and since the initial states of the steel bars in the mold are different, the steel bars are prone to uneven prestressing during the tensioning process (the same tensioning distance has different tensioning degrees of the steel bars), resulting in different degrees of prestressing on the steel bars, thereby affecting the normal use of the sleepers after production. Summary of the invention

[0004] In order to overcome the disadvantage of the existing tensioning device that the steel bars are unevenly prestressed, thereby reducing the production quality of sleepers, the present invention provides a tensioning device for the production of prestressed materials suitable for railway sleepers.

[0005] The technical solution is: a tensioning equipment for the production of prestressed materials suitable for rail sleepers, comprising: a base frame, the base frame is slidably connected to a movable frame, the movable frame is equipped with a first hydraulic push rod arranged in a mirror image; two connecting members are arranged in a mirror image, respectively rotatably connected to the telescopic ends of adjacent first hydraulic push rods, the connecting member is equipped with a shell, the shell is filled with a transmission medium, the shell is slidably connected to a sliding rod, the mirror-arranged shells are fixedly connected and connected with a first pipe and a second pipe, and the first pipe and the second pipe are both connected to an external hydraulic system; a guide member is fixedly connected to the base frame, the sliding rod is slidably connected to the guide member; a mounting frame is slidably connected to the guide member; two locking shells are arranged in a mirror image, both are rotatably connected to the mounting frame; a mold group is arranged on the base frame for molding the material; two limiting mechanisms are arranged in a mirror image, respectively arranged on adjacent sliding rods, and used to apply prestress to the mold group.

[0006] Further, the mold set includes: a mold shell disposed on a side of the chassis away from the housing, and the mold shell is slidably connected with tension rods arranged in a mirror image; a steel bar set, two of which are arranged at intervals and are both disposed in the mold shell; tension plates, a plurality of which are arranged at intervals and are respectively disposed between adjacent steel bar sets. A circumferentially arranged first protrusion is fixedly connected to a side of the tension rod away from the tension plate, and a locking nut is threadedly connected to the tension rod. Both the mold shell and the locking shell limit the locking nut.

[0007] Further, the limiting mechanism includes: a moving member fixedly connected to the sliding rod; a limiting shell rotatably and slidably connected to the moving member, and the limiting shell is provided with a circumferentially arranged second protrusion which is mutually limited with the first protrusion. A first elastic element is fixedly connected between the moving member and the limiting shell; a first triggering assembly is disposed on the limiting shell and is used for causing relative rotation between the moving member and the limiting shell; a locking assembly is disposed on the mounting frame and is used for locking the mold set.

[0008] Further, the first triggering assembly includes: a third protrusion disposed on the limiting shell, and the moving member is provided with a first limiting groove which limits the third protrusion. The first limiting groove is an inclined groove for causing relative rotation between the limiting shell and the moving member.

[0009] Further, the locking assembly includes: a rotating frame rotatably connected to the moving member, and the rotating frame is fixedly connected to the locking shell; a gear fixedly connected to the locking shell; a rack slidably connected to the mounting frame, and the rack meshes with the gear; a second triggering assembly is disposed on the guiding member and is used for causing relative sliding between the rack and the mounting frame.

[0010] Further, the second triggering assembly includes: a limiting frame fixedly connected to the guiding member, and the limiting frame is provided with a second limiting groove. A limiting post is fixedly connected to the rack, and the second limiting groove is used for limiting the limiting post. The second limiting groove is an inclined groove for causing relative sliding between the rack and the mounting frame.

[0011] Further, it further includes: a reset mechanism disposed on the guiding member and is used for causing the second protrusion to lose the limitation on the first protrusion. The reset mechanism includes: a second hydraulic push rod installed on the guiding member, and a fixed rod is fixedly connected to a telescopic end of the second hydraulic push rod; two deflecting rods are arranged at intervals and are respectively fixedly connected to adjacent limiting shells. A through groove is provided on the deflecting rod, and the fixed rod is used for extruding the through groove. The moving member is provided with a third limiting groove which is used for limiting the third protrusion, and the third limiting groove communicates with the first limiting groove.

[0012] Further, the projection of the third limiting groove on the vertical plane is vertical, and is used to make the limiting shell rotate along the sliding rod.

[0013] Further, it further includes: a knocking mechanism, which is arranged in a mirror image and is arranged on the mounting frame for applying a vibrating force to the locking shell; the knocking mechanism includes: a guiding frame fixedly connected to the mounting frame; a limiting ring fixedly connected to the locking shell, and the limiting ring is provided with circumferentially arranged convex blocks, the guiding frame is slidably connected with a sliding member, and a second elastic element is fixedly connected between the guiding frame and the sliding member; a knocking member rotatably connected to the sliding member, and the convex block on the limiting ring squeezes the knocking member, and a third elastic element is fixedly connected between the sliding member and the knocking member.

[0014] Further, the cross section of the convex block on the limiting ring is in the shape of a "right triangle", and is used for squeezing the knocking member in different directions.

[0015] Compared with the prior art, the present invention has at least the following advantages: the present invention connects the mirror-image arranged shells through the first pipe and the second pipe, so that the force exerted on the sliding rod by the transmission medium in the shell is uniform, and a uniform prestress is applied to the die set through the limiting mechanism, so that the preload applied to the sleeper is uniform, thereby improving the ability of the sleeper to resist external loads; the limiting shell quickly rotates under the action of the torsion of the first elastic element, so that the "biting" between the second protrusion and the adjacent first protrusion is completed to complete the limiting, avoiding the time-consuming and laborious phenomenon that occurs when using the conventional threaded connection method, thereby reducing the production efficiency of the sleeper; the locking shell is driven to rotate by the gear, so that the locking nut is always in close contact with the die shell, so as to always ensure the locking of the tension rod during the tensioning process, prevent the tension rod from resetting under the action of the "elastic force" generated by the deformation of the steel bar group after the tensioning is completed, thereby affecting the tensioning quality, while reducing the operation steps of the staff, reducing the working intensity of the staff, and shortening the time used in the tensioning process, thereby improving the tensioning efficiency; the knocking member knocks the limiting ring to generate a vibrating force, so as to release the stress accumulated inside the steel bar group, make the prestress of the steel bar group evenly distributed again, improve the tensioning effect, and thus improve the production quality of the sleeper. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the whole of the present invention;

[0017] Figure 2 is a three-dimensional structural schematic diagram of the chassis and its parts of the present invention;

[0018] Figure 3 is a three-dimensional structural sectional view of the moving frame and the shell of the present invention;

[0019] Figure 4 is a cross-sectional view of the three-dimensional structure when the rotating frame of the present invention drives the gear to rotate;

[0020] Figure 5 is a cross-sectional view of the three-dimensional structure when the moving part of the present invention rotates relative to the rotating frame;

[0021] Figure 6 is an exploded view of the three-dimensional structure of the sliding rod and its parts of the present invention;

[0022] Figure 7 is an exploded view of the three-dimensional structure of the guiding part and its parts of the present invention;

[0023] Figure 8 is a schematic diagram of the three-dimensional structure when the locking shell of the present invention drives the limiting ring to rotate;

[0024] Figure 9 For the present invention Figure 8 is an enlarged view of the three-dimensional structure at position A in;

[0025] Figure 10 is an exploded view of the three-dimensional structure of the guiding frame and its parts of the present invention.

[0026] Reference numerals in the drawings: 101 - die shell, 102 - tension rod, 103 - steel bar group, 104 - tension plate, 105 - first protrusion, 106 - locking nut, 1 - chassis, 2 - moving frame, 3 - first hydraulic push rod, 4 - connecting piece, 5 - housing, 6 - sliding rod, 7 - first pipe, 8 - second pipe, 9 - guiding part, 10 - mounting frame, 11 - locking shell, 1201 - moving part, 1202 - limiting shell, 1203 - second protrusion, 1204 - first elastic element, 1205 - third protrusion, 1206 - first limiting groove, 1301 - limiting frame, 1302 - rotating frame, 1303 - second limiting groove, 1304 - gear, 1305 - rack, 1306 - limiting column, 1401 - second hydraulic push rod, 1402 - fixing rod, 1403 - deflecting rod, 1404 - third limiting groove, 1501 - guiding frame, 1502 - limiting ring, 1503 - sliding part, 1504 - second elastic element, 1505 - knocking part, 1506 - third elastic element. Detailed Description of the Invention

[0027] Reference to an embodiment herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] As shown Figures 1 - 4 in the figure, an embodiment of the present invention provides a tensioning device for producing prestressed materials suitable for railway sleepers, aiming to solve the problem that it is difficult to evenly tension the steel bar group during the tensioning process of the existing tensioning device, resulting in uneven prestress of the steel bar group and affecting the subsequent normal use of the sleeper. The device includes: a chassis 1, a moving frame 2 is slidably connected to the chassis 1, and two first hydraulic push rods 3 arranged in mirror image are installed on the moving frame 2; connecting members 4, which are two arranged in mirror image, are respectively rotatably connected to the telescopic ends of adjacent first hydraulic push rods 3, a housing 5 is installed on the connecting member 4, a transmission medium is filled in the housing 5, a sliding rod 6 is slidably connected to the housing 5, the sliding rod 6 divides the housing 5 into two cavities, a first pipe 7 and a second pipe 8 are fixedly connected and communicated between the two housings 5, and both the first pipe 7 and the second pipe 8 are connected to an external hydraulic system; a guiding member 9 is fixedly connected to the chassis 1, and the sliding rod 6 is slidably connected to the guiding member 9; a mounting frame 10 is slidably connected to the guiding member 9; locking shells 11, which are two arranged in mirror image, are both rotatably connected to the mounting frame 10; a die set is arranged on the side of the chassis 1 away from the housing 5 for shaping the material; limiting mechanisms, which are two arranged in mirror image, are respectively arranged on adjacent sliding rods 6 for applying prestress to the die set.

[0029] In the above solution, a slide rail is provided on the chassis 1, and an electric slider is provided on the moving frame 2. The electric slider of the moving frame 2 slides on the slide rail of the chassis 1. The transmission medium in the housing 5 is hydraulic oil. The sliding rod 6 divides the housing 5 into two left and right cavities. The first pipe 7 connects the cavities on the left side of the two housings 5, and the second pipe 8 connects the cavities on the right side of the two housings 5. The axis of the sliding rod 6 coincides with the axis of the adjacent locking housing 11. The locking housing 11 is in the shape of a "hexagonal sleeve". When tensioning the steel bar group, the staff transfers the assembled mold group to the tensioning area, and then uses the electric slider to drive the moving frame 2 to move to the right. The moving frame 2 drives the first hydraulic push rod 3, the connecting piece 4, the housing 5 and the guiding piece 9 to move to the right together. The housing 5 drives the sliding rod 6 and the locking housing 11 to move to the right together. The sliding rod 6 drives the mounting frame 10 to move to the right together. The mounting frame 10 remains relatively stationary with the guiding piece 9 until the locking housing 11 moves to the right and contacts the mold group. Then, the hydraulic system is used to inject the external hydraulic oil into the cavity on the right side of the housing 5 and extract the hydraulic oil in the cavity on the left side of the housing 5. The two sliding rods 6 start to move to the left and apply uniform prestress to the mold group through the limiting mechanism, so as to improve the uniformity of the subsequent preload applied to the sleeper, and further improve the ability of the sleeper to resist external influence loads. Since the cavities on the same side of the left and right of the two housings 5 are connected, when the two sliding rods 6 are subjected to different forces during the tensioning of the mold group, the sliding rod 6 with a greater resistance remains stationary, and the sliding rod 6 with a smaller resistance slides relative to the adjacent housing 5 until the forces on the two sliding rods 6 are the same, and then the two sliding rods 6 move together (when the two sliding rods 6 are blocked differently, different displacements will occur, that is, their displacement amounts are different), so as to ensure that the prestress applied by the two sliding rods 6 to the mold group is the same.

[0030] As Figure 1 and Figure 2 shown, the mold group includes: a mold shell 101, which is arranged on the side of the chassis 1 away from the housing 5, and two mirror-image tension rods 102 are slidably connected to the mold shell 101; a steel bar group 103, which is arranged in two at intervals before and after and is arranged in the mold shell 101; tensioning plates 104, which are arranged at intervals and are respectively arranged between adjacent steel bar groups 103. The tension rods 102 are used to tension the tensioning plates 104. The tensioning plates 104 are fixedly connected to the adjacent steel bar groups 103. Three first protrusions 105 arranged circumferentially are fixedly connected to the left side of the tension rod 102. The tension rod 102 is threadedly connected with a locking nut 106. Both the mold shell 101 and the locking housing 11 limit the locking nut 106. Most of the parts on the mold group are existing technologies, and only the first protrusion 105 is added to cooperate with the limiting mechanism.

[0031] As Figures 3 - 7As shown in the figure, the limiting mechanism includes: a moving member 1201 fixedly connected to the sliding rod 6; a limiting shell 1202 rotatably and slidably connected to the moving member 1201. The limiting shell 1202 is provided with three second protrusions 1203 arranged circumferentially. The second protrusions 1203 are mutually limited with the first protrusion 105. A first elastic element 1204 is fixedly connected between the moving member 1201 and the limiting shell 1202; a first trigger assembly is arranged on the limiting shell 1202 and is used to make the moving member 1201 and the limiting shell 1202 rotate relative to each other. The first trigger assembly includes: a third protrusion 1205 arranged on the limiting shell 1202. The moving member 1201 is provided with a first limiting groove 1206 which limits the third protrusion 1205. The first limiting groove 1206 is an inclined groove and is used to make the limiting shell 1202 and the moving member 1201 rotate relative to each other; a locking assembly is arranged on the mounting frame 10 and is used to lock the mold set.

[0032] In the above solution, the axis of the moving member 1201 coincides with the axis of the limiting shell 1202. The first elastic element 1204 is a spring and can undergo axial and radial deformations, and is used to apply torsion and elastic force to the adjacent limiting shell 1202. The first limiting groove 1206 gradually inclines to the left from top to bottom (taking the figure as an example). During the process of the sliding rod 6 moving to the right, the sliding rod 6 drives the moving member 1201 to move to the right together. The moving member 1201 drives the limiting shell 1202 to move to the right together through the first elastic element 1204. The limiting shell 1202 drives the second protrusion 1203 to move to the right together. After the second protrusion 1203 moves to the right and contacts the first protrusion 105, as the moving member 1201 continues to move to the right, the first limiting groove 1206 begins to squeeze the third protrusion 1205. Subsequently, the third protrusion 1205 drives the limiting shell 1202 to rotate clockwise under the squeezing action of the first limiting groove 1206 (as shown in Figure 6 the figure). Figure 6Taking the right view direction as an example, the limiting shell 1202 drives the second protrusion 1203 to rotate clockwise together. During the process, the limiting shell 1202 and the moving part 1201 continuously undergo axial relative sliding and circumferential relative rotation (the first elastic element 1204 deforms and generates elastic force and torsion). The second protrusion 1203 and the adjacent first protrusion 105 gradually interleave. When they are completely interleaved, the limiting shell 1202 begins to move rapidly to the right under the action of the elastic force of the first elastic element 1204. After the second protrusion 1203 passes the first protrusion 105, the limiting shell 1202 quickly rotates back (counterclockwise) under the action of the torsion of the first elastic element 1204. In this way, the "biting" between the second protrusion 1203 and the adjacent first protrusion 105 is completed (at this time, the third protrusion 1205 is again located at the upper end of the first limiting groove 1206, that is, reset), so as to avoid the time-consuming and laborious phenomenon that occurs when using the conventional threaded connection method, thereby reducing the production efficiency of the sleeper. After the "biting" between the second protrusion 1203 and the adjacent first protrusion 105, the sliding rod 6 is moved to the left through the hydraulic system. In this way, the limiting shell 1202 drives the tension rod 102 to move to the left through the "biting" between the second protrusion 1203 and the adjacent first protrusion 105, so as to apply prestress to the steel bar group 103 to achieve the tensioning purpose. After the tensioning is completed, the reset mechanism is used to reset each part.

[0033] As Figures 3 - 7 shown, the locking assembly includes: a rotating frame 1302, rotatably connected to the moving part 1201, and the rotating frame 1302 is fixedly connected to the locking shell 11; a gear 1304, fixedly connected to the locking shell 11; a rack 1305, slidably connected to the mounting frame 10, and the rack 1305 meshes with the gear 1304; a second trigger assembly, arranged on the guide part 9, for making the rack 1305 and the mounting frame 10 undergo relative sliding. The second trigger assembly includes: a limiting frame 1301, fixedly connected to the guide part 9, and the limiting frame 1301 is provided with a second limiting groove 1303; the rack 1305 is fixedly connected with a limiting column 1306, and the second limiting groove 1303 is used for limiting the limiting column 1306. The second limiting groove 1303 is an inclined groove, which is used for making the rack 1305 and the mounting frame 10 undergo relative sliding.

[0034] In the above solution, the second limiting groove 1303 gradually inclines backward from left to right (taking Figure 7Taking the second limiting groove 1303 on the front side as an example, the axis of the rotating frame 1302 coincides with the axis of the adjacent sliding rod 6. During the process of the sliding rod 6 moving leftward (tensioning process), the sliding rod 6 drives the mounting frame 10 to move leftward together. The mounting frame 10 and the guiding member 9 undergo relative sliding. The mounting frame 10 drives the locking shell 11 and the rack 1305 to move leftward together. The locking shell 11 drives the gear 1304 to move leftward together. During this process, the locking shell 11 and the limiting shell 1202 remain relatively stationary. The rack 1305 drives the limiting column 1306 to move leftward together. The limiting column 1306 starts to slide within the second limiting groove 1303. Under the limiting effect of the second limiting groove 1303, the two limiting columns 1306 respectively drive the adjacent racks 1305 to move away from each other. The rack 1305 drives the gear 1304 to start rotating. The gear 1304 drives the locking shell 11 to rotate together. The locking shell 11 drives the locking nut 106 to rotate together. The locking nut 106 starts to move rightward along the adjacent tension rod 102. The locking nut 106 and the locking shell 11 undergo axial relative sliding. During this process, the locking nut 106 always keeps in close contact with the mold shell 101, so as to always ensure the locking of the tension rod 102 during the tensioning process, prevent the tension rod 102 from resetting under the action of the "elastic force" generated by the deformation of the steel bar group 103 after the tensioning is completed, thereby affecting the tensioning quality, reducing the operation steps of the staff, lowering the working intensity of the staff, and shortening the time used during the tensioning process, so as to improve the tensioning efficiency.

[0035] As Figures 5 - 8 shown, it further includes: a reset mechanism, arranged on the guiding member 9, for making the second protrusion 1203 lose the limit on the first protrusion 105. The reset mechanism includes: a second hydraulic push rod 1401, installed on the guiding member 9, and the telescopic end of the second hydraulic push rod 1401 is fixedly connected with a fixed rod 1402; two deflecting rods 1403, arranged at intervals, are respectively fixedly connected to the adjacent limiting shells 1202. A through groove is arranged on the deflecting rod 1403, and the axis of the through groove is parallel to the axis of the deflecting rod 1403. The fixed rod 1402 is used to squeeze the through groove. The moving member 1201 is provided with a third limiting groove 1404, and the third limiting groove 1404 is used to limit the third protrusion 1205. The third limiting groove 1404 communicates with the first limiting groove 1206. The projection of the third limiting groove 1404 on the vertical plane is vertical, and is used to make the limiting shell 1202 rotate along the sliding rod 6.

[0036] In the above solution, after the tensioning work is completed, the telescopic end of the second hydraulic push rod 1401 is used to drive the fixed rod 1402 to move forward (as Figure 8 shown as an example), the fixed rod 1402 squeezes the deflecting rod 1403, and the deflecting rod 1403 starts to rotate clockwise (as Figure 8Taking the left view direction as an example, the deflection rod 1403 drives the limit shell 1202 to rotate clockwise together. The third protrusion 1205 slides downward in the third limit groove 1404. The limit shell 1202 drives the second protrusion 1203 to rotate clockwise together. The second protrusion 1203 and the first protrusion 105 gradually lose their "engagement". When the two completely lose their "engagement", the electric slider is used to drive the moving frame 2 and its parts to move leftward, so that the second protrusion 1203 is reset (the locking shell 11 is disengaged from the locking nut 106), thereby reducing the operation steps of the staff and improving the tensioning efficiency. Subsequently, the staff transfers the mold set (after completing the tensioning work), and then uses the hydraulic system to move the sliding rod 6 and its parts rightward. During this process, the sliding rod 6 drives the locking shell 11 and the rack 1305 (the limit post 1306) to move rightward together through the mounting frame 10. The locking shell 11 drives the gear 1304 to move rightward together. The limit post 1306 slides in the second limit groove 1303 (the two racks 1305 move toward each other, and the gear 1304 rotates reversely). After all parts are reset, the machine can be stopped.

[0037] As Figures 8 - 10 shown, it further includes: knocking mechanisms, two of which are arranged in a mirror image and are both arranged on the mounting frame 10 for applying a shock force to the locking shell 11; the knocking mechanism includes: a guiding frame 1501 fixedly connected to the mounting frame 10; a limiting ring 1502 fixedly connected to the locking shell 11. A number of circumferentially arranged protrusions are arranged on the limiting ring 1502. A sliding member 1503 is slidably connected to the guiding frame 1501. A second elastic element 1504 is fixedly connected between the guiding frame 1501 and the sliding member 1503; a knocking member 1505 is rotatably connected to the sliding member 1503. The cross-section of the protrusion on the limiting ring 1502 is a "right triangle" for squeezing the knocking member 1505 in different directions. The protrusion on the limiting ring 1502 squeezes the knocking member 1505. A third elastic element 1506 is fixedly connected between the sliding member 1503 and the knocking member 1505.

[0038] In the above solution, the second elastic element 1504 is a tension spring for applying a tensile force to the sliding member 1503, and the third elastic element 1506 is a torsion spring for resetting the striking member 1505. The "right-angle side" of the convex block on the limiting ring 1502 coincides with the adjacent meridian line on the adjacent locking shell 11. During the rotation of the locking shell 11 (tensioning process), the locking shell 11 drives the limiting ring 1502 to rotate together. When the inclined surface of the convex block on the limiting ring 1502 contacts the striking member 1505, the striking member 1505 is squeezed and starts to move upward. The striking member 1505 drives the sliding member 1503 to move upward together. The sliding member 1503 slides relative to the guide frame 1501, and the second elastic element 1504 is stretched. As the limiting ring 1502 continues to rotate, the second elastic element 1504 continues to be stretched. When the convex block on the limiting ring 1502 rotates past the striking member 1505, the sliding member 1503 drives the striking member 1505 to quickly move downward under the action of the tensile force of the second elastic element 1504, and finally the striking member 1505 strikes the limiting ring 1502. The limiting ring 1502 transmits the vibration force to the steel bar group 103 through the locking shell 11, the locking nut 106, the tension rod 102, and the tension plate 104, so as to release the stress accumulated inside the steel bar group 103, redistribute the prestress of the steel bar group 103 evenly, improve the tensioning effect, and further improve the production quality of the sleeper.

[0039] During the reverse rotation of the gear 1304, the gear 1304 drives the limiting ring 1502 to reverse together through the locking shell 11. When the "straight surface" of the convex block on the limiting ring 1502 contacts the striking member 1505, the striking member 1505 is squeezed and starts to deflect forward (as Figure 9 shown), the striking member 1505 rotates relative to the sliding member 1503, and the third elastic element 1506 deforms. After the convex block on the limiting ring 1502 passes the striking member 1505, the striking member 1505 resets under the action of the torsion of the third elastic element 1506, and this cycle continues until all parts are completely reset.

[0040] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes may be made therein without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A tensioning device for the production of prestressed materials applicable to railway sleepers, characterized in that, It includes: A chassis (1), a moving frame (2) is slidably connected to the chassis (1), and a first hydraulic push rod (3) arranged in a mirror image is installed on the moving frame (2); Connectors (4), there are two arranged in a mirror image, which are respectively rotatably connected to the telescopic ends of the adjacent first hydraulic push rods (3). A housing (5) is installed on the connectors (4). A transmission medium is filled in the housing (5). A sliding rod (6) is slidably connected to the housing (5). A first pipe (7) and a second pipe (8) are fixedly connected and communicated between the mirror-image arranged housings (5). The sliding rod (6) divides the housing (5) into two left and right cavities. The first pipe (7) communicates the cavities on the left side of the two housings (5), and the second pipe (8) communicates the cavities on the right side of the two housings (5). Both the first pipe (7) and the second pipe (8) are connected to an external hydraulic system; a guide member (9) is fixedly connected to the chassis (1), and the sliding rod (6) is slidably connected to the guide member (9); A mounting frame (10) is slidably connected to the guide member (9), and the sliding rod (6) is fixedly connected to the mounting frame (10); Locking shells (11), there are two arranged in a mirror image, and both are rotatably connected to the mounting frame (10); A mold set is arranged on the chassis (1) and is used for shaping materials; Limiting mechanisms, there are two arranged in a mirror image, which are respectively arranged on the adjacent sliding rods (6) and are used for applying prestress to the mold set; The mold set includes: A mold shell (101) is arranged on one side of the chassis (1) away from the housing (5). Mirror-image arranged tension rods (102) are slidably connected to the mold shell (101); Two reinforcing bar groups (103) are arranged at intervals and are both arranged in the mold shell (101); a plurality of tension plates (104) are arranged at intervals and are respectively arranged between the adjacent reinforcing bar groups (103). A circumferentially arranged first protrusion (105) is fixedly connected to the side of the tension rod (102) away from the tension plate (104). A locking nut (106) is threadedly connected to the tension rod (102). Both the mold shell (101) and the locking shell (11) limit the locking nut (106); The limiting mechanism includes: A moving member (1201) is fixedly connected to the sliding rod (6); A limiting shell (1202) is rotatably and slidably connected to the moving member (1201). A circumferentially arranged second protrusion (1203) is arranged on the limiting shell (1202). The second protrusion (1203) is mutually limited with the first protrusion (105). A first elastic element (1204) is fixedly connected between the moving member (1201) and the limiting shell (1202); A first trigger assembly is arranged on the limiting shell (1202) and is used for making the moving member (1201) and the limiting shell (1202) rotate relatively; A locking assembly is arranged on the mounting frame (10) and is used for locking the mold set.

2. The tensioning device for the production of prestressed materials applicable to railway sleepers according to claim 1, characterized in that, The first trigger assembly includes: The third protrusion (1205) is arranged on the limit shell (1202). The moving member (1201) is provided with a first limit groove (1206) which limits the third protrusion (1205). The first limit groove (1206) is an inclined groove for enabling relative rotation between the limit shell (1202) and the moving member (1201).

3. The tensioning device for the production of prestressed materials applicable to railway sleepers according to claim 2, characterized in that, The locking assembly includes: A rotating frame (1302) is rotatably connected to the moving member (1201), and the rotating frame (1302) is fixedly connected to the locking shell (11); A gear (1304) is fixedly connected to the locking shell (11); A rack (1305) is slidably connected to the mounting frame (10), and the rack (1305) meshes with the gear (1304); A second triggering assembly is arranged on the guiding member (9) for enabling relative sliding between the rack (1305) and the mounting frame (10).

4. The tensioning device for the production of prestressed materials applicable to railway sleepers according to claim 3, characterized in that, The second triggering assembly includes: A limit frame (1301) is fixedly connected to the guiding member (9). The limit frame (1301) is provided with a second limit groove (1303). The rack (1305) is fixedly connected with a limit post (1306). The second limit groove (1303) is used for limiting the limit post (1306). The second limit groove (1303) is an inclined groove for enabling relative sliding between the rack (1305) and the mounting frame (10).

5. The tensioning device for the production of prestressed materials applicable to railway sleepers according to claim 4, characterized in that, It further includes: A reset mechanism is arranged on the guiding member (9) for enabling the second protrusion (1203) to lose the limit on the first protrusion (105). The reset mechanism includes: A second hydraulic push rod (1401) is installed on the guiding member (9), and a fixed rod (1402) is fixedly connected to the telescopic end of the second hydraulic push rod (1401); Deflection rods (1403) are two arranged at intervals and are respectively fixedly connected to adjacent limit shells (1202). Through grooves are arranged on the deflection rods (1403). The fixed rod (1402) is used for extruding the through grooves. The moving member (1201) is provided with a third limit groove (1404) which is used for limiting the third protrusion (1205). The third limit groove (1404) communicates with the first limit groove (1206).

6. The tensioning device for the production of prestressed materials applicable to railway sleepers according to claim 5, characterized in that, The projection of the third limit groove (1404) on the vertical plane is vertical for enabling the limit shell (1202) to rotate along the sliding rod (6).

7. The tensioning device for the production of prestressed materials applicable to railway sleepers according to claim 6, characterized in that, It further includes: Knocking mechanisms are arranged on the mounting frame (10) in a mirror image arrangement for applying a vibration force to the locking shell (11). The knocking mechanisms include: A guiding frame (1501) is fixedly connected to the mounting frame (10); The limiting ring (1502) is fixedly connected to the locking shell (11). A convex block arranged circumferentially is provided on the limiting ring (1502). A sliding member (1503) is slidably connected to the guiding frame (1501), and a second elastic element (1504) is fixedly connected between the guiding frame (1501) and the sliding member (1503); The knocking member (1505) is rotatably connected to the sliding member (1503). The convex block on the limiting ring (1502) squeezes the knocking member (1505), and a third elastic element (1506) is fixedly connected between the sliding member (1503) and the knocking member (1505).

8. A tensioning device for the production of prestressed materials applicable to railway sleepers according to claim 7, characterized in that, The cross-section of the convex block on the limiting ring (1502) is a "right triangle" for squeezing the knocking member (1505) in different directions.

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