Single-set double-cylinder hydraulic pliers and use method thereof

Abstract

The present invention discloses a single-set double-cylinder hydraulic pliers and a method for using the same, relating to the technical field of mechanical connection. The double-cylinder hydraulic pliers include a cylinder body, the cylinder body includes a cylinder inner cavity and a cylinder outer sleeve, the upper jaw is connected to the piston rod in the cylinder inner cavity, the lower jaw is connected to the piston rod of the cylinder outer sleeve, and also includes a movable ring, the top of the lower jaw is provided with a placement groove, the placement groove is provided with a movable ring, the movable ring is divided into a top ring for placing a sleeve and a bottom ring for extruding the sleeve, the diameter of the top ring is larger than the diameter of the bottom ring, and the top ring and the bottom ring are connected by an inclined ring body; when the sleeve is connected to the steel bar, the sleeve is wrapped around the outer walls of the two steel bars, the lower jaw and the top ring of the movable ring are sleeved on the sleeve, the cylinder body drives the lower jaw to move upward, so that the lower jaw drives the movable ring and the sleeve to move upward, so that the movable ring extrude and deform the sleeve, so that the sleeve performs a connection operation on the steel bar.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical connection, in particular to a single-set double-cylinder hydraulic pliers and a method for using the same. Background Art

[0002] It is well known that when concrete structures are constructed using prefabricated construction techniques, the main methods for connecting steel bars in prefabricated components are grouting joints and mechanical steel connections. The most common mechanical steel connection method involves inserting a steel connector around the outside of two steel bars. The connector is then deformed by radially or axially squeezing the connector using a corresponding steel connection tool, causing it to interlock with the two connected steel bars, thereby achieving the desired connection.

[0003] During the construction of nuclear power projects, when the foundation and the columns are connected, the steel bars in the foundation extend upward, and the steel bars in the columns extend downward. The steel bars in the columns and the steel bars in the concrete (that is, in the foundation) are set correspondingly. When the foundation and the columns are connected, the foundation is fixed underground. The workers lift the columns with a crane so that the steel bars in the columns and the steel bars in the foundation are connected to each other one by one. Then, the casing is placed on the outside of the corresponding steel bars (that is, the steel bars in the foundation and the steel bars in the columns), and then a tool (that is, hydraulic pliers) is used to squeeze the casing to deform the casing, thereby connecting the two corresponding steel bars together, thereby realizing the steel bar connection operation.

[0004] As the name suggests, the double-cylinder hydraulic pliers are a pliers structure with driving power provided by two or more hydraulic cylinders. The double-cylinder hydraulic pliers squeeze the casing through the jaws, so that the casing can be connected to the steel bar.

[0005] For example, the patent with the publication number CN206503373U and the publication date of September 19, 2017, entitled "A Mechanical Connection Device for Steel Bars," discloses a mechanical connection device for steel bars, comprising a hydraulic fastening clamp and a connecting sleeve. The hydraulic fastening clamp is provided with a clamp head body at the top, a jaw is provided on one side of the clamp head body, a hydraulic wide pipe is installed at the end of the clamp head body, a hydraulic pipe is installed at the end of the hydraulic wide pipe, a fixed handle is installed at the end of the hydraulic pipe, a connecting port is provided on one side of the hydraulic pipe, a movable handle is installed at the top of the connecting port, a hydraulic valve is provided on the side of the connecting port, and fastening heads are installed at both ends of the connecting sleeve. This mechanical connection device for steel bars can strengthen the firmness of the connecting sleeve through the hydraulic fastening clamp, achieve hydraulic linkage through the hydraulic pipe and the hydraulic wide pipe to enhance the bite force, control the bite and release of the jaws through the hydraulic valve, facilitate manual advancement of the jaws through the movable handle, and achieve mechanical connection of steel bars through the connecting sleeve.

[0006] The shortcoming of the existing technology is that when the double-cylinder hydraulic pliers extrude the casing to connect the steel bars, only the two side walls of the jaws extrude the casing, so that the stress points of the casing are only at the contraction positions of the two jaws. The casing is unevenly stressed when it is compressed and deformed, thereby affecting the connection effect of the casing to the steel bars. At the same time, the stress points of the casing are deformed and worn quickly, affecting the service life. Summary of the Invention

[0007] The purpose of the present invention is to provide a single-set double-cylinder hydraulic pliers and a method of using the same, so as to solve the technical problems in the related art.

[0008] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a single-sleeve double-cylinder hydraulic pliers, including a cylinder body, the cylinder body including a cylinder inner cavity and a cylinder outer sleeve, the piston rod in the cylinder inner cavity is connected to an upper jaw, the piston rod of the cylinder outer sleeve is connected to a lower jaw, and also includes a movable ring, the top end of the lower jaw is provided with a placement groove, a movable ring is provided in the placement groove, the movable ring is divided into a top ring for placing the sleeve and a bottom ring for extruding the sleeve, the inner diameter of the top ring is larger than the inner diameter of the bottom ring, and the top ring and the bottom ring are connected by a bevel ring body.

[0009] As mentioned above, the movable ring is composed of a plurality of arc-shaped plates evenly arranged along its circumferential direction, and the ends of the arc-shaped plates are connected to form an integral movable ring.

[0010] As mentioned above, the upper jaw is provided with an upper opening, the inner wall of the upper jaw is provided with a positioning groove, and a limiting tube is provided in the positioning groove.

[0011] As mentioned above, the position limiting tube is composed of two position limiting half tubes, and the two position limiting half tubes are connected to each other through a threaded rod to form an integral position limiting tube.

[0012] As mentioned above, a slot is provided at the top end of the lower jaw, and a locking plate is inserted into the slot.

[0013] As mentioned above, the side of the locking plate is an arc-shaped structure, the arc-shaped structure of the locking plate and the placement groove are combined to form an annular groove body, and two insertion rods are symmetrically provided at both ends of the locking plate.

[0014] As mentioned above, a straight groove is provided on each side of the top end of the lower jaw at the slot, and the two straight grooves are respectively plugged into and matched with the corresponding insertion rods.

[0015] As mentioned above, a locking mechanism is provided in each of the two straight grooves, and the two locking mechanisms respectively perform positioning operations on the two insertion rods.

[0016] As mentioned above, the limiting tube and the inner wall of the positioning groove are threadedly connected.

[0017] A method for using a single-set double-cylinder hydraulic pliers is based on the above-mentioned single-set double-cylinder hydraulic pliers, and the method for using the single-set double-cylinder hydraulic pliers comprises the following steps:

[0018] 1. Rebar docking: After fixing the concrete foundation, put the sleeve on the outer wall of the steel bar on the foundation, move the concrete column vertically to the top of the foundation, and align the corresponding steel bars of the foundation and column;

[0019] 2. Moving and tightening: Place the double-cylinder hydraulic pliers on the side of the casing, thread the limiting half-tube into the positioning groove, and then connect the two limiting half-tubes to each other through the threaded rod, so that the two limiting half-tubes clamp and limit the column steel bars, and then wrap the movable ring on the outer wall of the foundation steel bars, and install the movable ring in the placement groove, and then slide the casing into the top ring of the movable ring, and then drive the lower jaw through the cylinder body to drive the movable ring and casing to move upward, so that the casing is pressed against the bottom surface of the limiting tube, and continue to push the casing upward, so that the lower jaw supports the movable ring and casing while driving the movable ring and casing to move upward, as the lower jaw moves upward, the casing is inserted into and passes through the movable ring, and the movable ring moves upward to reduce the diameter of the casing, so that the casing connects the two steel bars.

[0020] The beneficial effect of the present invention is that when the sleeve is used to connect the steel bars, the sleeve is wrapped around the outer walls of the two steel bars, and then the upper jaw and the lower jaw are placed on the sides of the sleeve, and then the lower jaw and the top ring of the movable ring are sleeved on the sleeve, so that the sleeve is located on the top ring of the movable ring, and the lower jaw is driven to move upward by the cylinder body, so that the lower jaw drives the movable ring and the sleeve to move upward, and when the sleeve is pressed against the inner wall of the bottom end of the upper jaw, the lower jaw continues to drive the movable ring and the sleeve to move upward, and since the inner diameter of the top ring is larger than the inner diameter of the bottom ring, the movable ring squeezes and deforms the sleeve, so that the sleeve is connected to the steel bars, and the movable ring fully wraps the sleeve, so that the force on the sleeve during deformation is more uniform, thereby improving the stability of the connection between the sleeve and the steel bars. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of a partial three-dimensional structure of an embodiment provided by the present invention from a first viewing angle;

[0023] Figure 2It is a schematic diagram of the partial three-dimensional structure of the lower jaw of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the locking plate and the insertion rod of the present invention;

[0025] Figure 4 For the present invention Figure 1 Schematic diagram of the cross-section structure;

[0026] Figure 5 A schematic diagram of a partial three-dimensional structure of an embodiment provided by the present invention from a second viewing angle;

[0027] Figure 6 A schematic diagram of a partial cross-sectional structure of another embodiment provided by the present invention;

[0028] Figure 7 For the present invention Figure 3 Schematic diagram of the cross-section structure;

[0029] Figure 8 is a schematic cross-sectional structural diagram of the movable ring of the present invention from a first viewing angle;

[0030] Figure 9 is a schematic cross-sectional structural diagram of the movable ring of the present invention from a second viewing angle;

[0031] Figure 10 Schematic diagram of the three-dimensional structure of the movable ring of the present invention;

[0032] Figure 11 A schematic cross-sectional view of a first perspective view of another embodiment provided by the present invention;

[0033] Figure 12 A schematic cross-sectional view of another embodiment of the present invention showing two arc-shaped plates and a half-arc plate combined to form a complete annular structure;

[0034] Figure 13 A schematic cross-sectional view of a second perspective of another embodiment provided by the present invention;

[0035] Figure 14 The present invention also provides a schematic cross-sectional structure of an embodiment;

[0036] Figure 15 The present invention also provides a schematic cross-sectional structure of an embodiment of the two arc-shaped plates and half-surface arc plates combined together to form a complete annular structure;

[0037] Figure 16 For the present invention Figure 15 A schematic diagram of a partially enlarged cross-sectional structure at M;

[0038] Figure 17A schematic cross-sectional structure diagram of an arc-shaped plate according to another embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Cylinder body; 2. Upper jaw; 3. Lower jaw; 4. Movable ring; 5. Placement groove; 6. Top ring; 7. Bottom ring; 8. Bevel ring; 9. Arc plate; 10. Positioning groove; 11. Limiting tube; 12. Limiting half tube; 13. Threaded rod; 14. Slot; 15. Locking plate; 16. Insert rod; 17. Straight groove; 18. Positioning rod; 19. First elastic member; 20. Through groove; 21. Concave hole; 22. Slide groove; 23. U-shaped sliding plate; 24. Driven round rod; 25. Driven gear; 26. Active Rack; 27. Arc-shaped plate; 28. Half-surface arc plate; 29. ​​Hollow groove; 30. Hydraulic cylinder body; 31. U-shaped connecting plate; 32. Oblique groove; 33. L-shaped plate; 34. Wedge-shaped plate; 35. Oblique support rod; 36. Arc-shaped groove; 37. Extrusion groove; 38. Extrusion block; 39. Pushing block; 40. Second elastic member; 41. Follower block; 42. Third elastic member; 43. Passive block; 44. Fourth elastic member; 45. Limiting groove; 46. Movable teeth; 47. Limiting round rod; 48. Fifth elastic member. DETAILED DESCRIPTION

[0041] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1 To the attached Figure 17 The present invention is further described in detail.

[0042] An embodiment provided by the present invention relates to a single-sleeve double-cylinder hydraulic pliers, including a cylinder body 1, the cylinder body 1 including a cylinder inner cavity and a cylinder outer sleeve, the piston rod in the cylinder inner cavity is connected to an upper jaw 2, the piston rod of the cylinder outer sleeve is connected to a lower jaw 3, and also includes a movable ring 4, the top of the lower jaw 3 is provided with a placement groove 5, the placement groove 5 is provided with a movable ring 4, the movable ring 4 is divided into a top ring 6 for placing the sleeve and a bottom ring 7 for extruding the sleeve, the inner diameter of the top ring 6 is larger than the inner diameter of the bottom ring 7, and the top ring 6 and the bottom ring 7 are connected by a bevel ring body 8.

[0043] Specifically, the double-cylinder hydraulic pliers are devices in which both the upper jaw 2 and the lower jaw 3 can perform linear motion under the hydraulic pressure of the cylinder body 1. The upper jaw 2 can perform linear reciprocating motion along the linear direction of the cylinder body 1 under the push of the piston rod in the cylinder cavity, and the lower jaw 3 can perform linear reciprocating motion along the linear direction of the cylinder body 1 on the cylinder outer sleeve, which is similar to a two-way telescopic mechanism, except that the driving source is hydraulic. It is common knowledge in the field that the upper jaw 2 and the lower jaw 3 perform linear reciprocating motion under the hydraulic pressure of the cylinder body 1, and will not be repeated. A placement groove 5 is provided on the lower jaw 3, and the placement groove 5 is a semicircular arc surface on the side close to the cylinder body 1. , the placement groove 5 is an open through groove on one side away from the cylinder body 1, which is convenient for the steel bars and sleeves to enter the semicircular surface from the through groove, so that the steel bars and sleeves can be placed in the lower jaw 3, and the movable ring 4 is divided into a top ring 6 for placing the sleeve and a bottom ring 7 for squeezing the sleeve. The inner diameter of the top ring 6 is larger than the inner diameter of the bottom ring 7, and the top ring 6 and the bottom ring 7 are connected by an inclined ring body 8. The movable ring 4 is composed of a plurality of arc plates 9 uniformly arranged along its circumferential direction, and the ends of each arc plate 9 are connected to each other to form an integral movable ring 4, that is, the inner diameter of the arc surface of the top end of the arc plate 9 is larger than the inner diameter of the arc surface of the bottom end of the arc plate 9 (such as Figure 8 、 Figure 9 and Figure 10As shown in the figure, the annular surface with a larger inner diameter formed by the top ends of the arc-shaped plates 9 is the top ring 6, and the annular surface with a smaller inner diameter formed by the bottom ends of the arc-shaped plates 9 is the bottom ring 7. The upper jaw 2 is provided with an upper opening, and a positioning groove 10 is provided on the inner wall of the upper jaw 2. A limiting tube 11 is provided in the positioning groove 10; the limiting tube 11 is composed of two limiting half-tubes 12, and the two limiting half-tubes 12 are connected to each other through a threaded rod 13 to form an integral limiting tube 11; the limiting tube 11 is threadedly connected to the inner wall of the positioning groove 10, wherein the limiting half-tube 12 close to the side of the cylinder body 1 is threadedly connected to the positioning On the groove 10, the two limiting half pipes 12 are connected to each other by a threaded rod 13; a slot 14 is provided at the top of the lower jaw 3, and a locking plate 15 is inserted into the slot 14; the side of the locking plate 15 is an arc-shaped structure, and the arc structure of the locking plate 15 and the placement groove 5 are combined with each other to form an annular groove body, and two insertion rods 16 are symmetrically provided at both ends of the locking plate 15; the top of the lower jaw 3 is located on both sides of the slot 14 and a straight groove 17 is provided on each side, and the two straight grooves 17 are respectively plugged into and matched with their corresponding insertion rods 16. Through the plug-in cooperation between the locking plate 15 and the two insertion rods 16 and the straight groove 17 and the slot 14, An annular groove is formed on the lower jaw 3, and the movable ring 4 is placed in the annular groove. When the sleeve is used to connect the steel bars, the sleeve is wrapped around the outer walls of the two corresponding steel bars (that is, the steel bars on the foundation and the steel bars on the column). Then the upper jaw 2 and the lower jaw 3 are placed on the sides of the sleeve and the steel bars, that is, the limiting half-tube 12 close to the side of the cylinder body 1 is pressed against the outer wall of the steel bars. Then the staff uses a tool to connect the two limiting half-tubes 12 to each other through the threaded rod 13, so that the steel bars are located inside the two limiting half-tubes 12, and then the lower jaw 3 and the top ring 6 of the movable ring 4 are sleeved on the sleeve, so that the sleeve is located at the top ring 6 of the movable ring 4 On, the locking plate 15 is inserted into the slot 14, so that the locking plate 15 positions the movable ring 4, and the lower jaw 3 is driven to move upward by the cylinder body 1, so that the lower jaw 3 drives the movable ring 4 and the sleeve to move upward until the sleeve is tightly against the inner wall of the bottom end of the limiting tube 11, and the lower jaw 3 continues to drive the movable ring 4 and the sleeve to move upward. Since the inner diameter of the top ring 6 is larger than the inner diameter of the bottom ring 7, the movable ring 4 squeezes and deforms the sleeve, so that the sleeve is deformed and connected to the steel bar, realizing a comprehensive wrapping connection of the movable ring 4 to the sleeve, making the force on the sleeve more uniform during deformation, thereby improving the stability of the sleeve connection to the steel bar.

[0044] The shortcoming of the existing technology is that when the double-cylinder hydraulic pliers extrude the casing to connect the steel bars, only the two side walls of the jaws extrude the casing, so that the stress points of the casing are only at the contraction positions of the two jaws. The casing is unevenly stressed when it is compressed and deformed, thereby affecting the connection effect of the casing to the steel bars. At the same time, the stress points of the casing are deformed and worn quickly, affecting the service life.

[0045] The beneficial effect of this embodiment is that when the sleeve is used to connect the steel bars, the sleeve is wrapped around the outer walls of the two steel bars, and then the upper jaw 2 and the lower jaw 3 are placed on the sides of the sleeve, and then the lower jaw 3 and the top ring 6 of the movable ring 4 are sleeved on the sleeve, so that the sleeve is located on the top ring 6 of the movable ring 4, and the lower jaw 3 is driven to move upward by the cylinder body 1, so that the lower jaw 3 drives the movable ring 4 and the sleeve to move upward. When the sleeve is pressed against the inner wall of the bottom end of the upper jaw 2, the lower jaw 3 continues to drive the movable ring 4 and the sleeve to move upward. Since the inner diameter of the top ring 6 is larger than the inner diameter of the bottom ring 7, the movable ring 4 squeezes and deforms the sleeve, so that the sleeve is connected to the steel bars, and the movable ring 4 fully wraps the sleeve, so that the force on the sleeve during deformation is more uniform, thereby improving the stability of the sleeve connection to the steel bars.

[0046] In another embodiment provided by the present invention, a locking mechanism is provided in each of the two straight grooves 17, and the two locking mechanisms respectively perform positioning operations on the two insertion rods 16. The locking mechanism includes a positioning rod 18 and a first elastic member 19. Two through grooves 20 are symmetrically provided on the two side walls of the lower jaw 3. The two through grooves 20 are respectively communicated with their corresponding straight grooves 17. A positioning rod 18 is slidably provided in each of the two through grooves 20. The positioning rod 18 and the inner wall of the through groove 20 are each connected by a first elastic member 19. A concave hole 21 is provided on each of the two insertion rods 16, and the two concave holes 21 are respectively plugged into and matched with their corresponding positioning rods 18.

[0047] The locking plate 15 is not positioned in the slot 14, so in order to prevent the locking plate 15 from sliding in the slot 14, it is necessary to perform a certain positioning operation on the locking plate 15. When the locking plate 15 is inserted into the slot 14, the two insertion rods 16 on the locking plate 15 are respectively inserted into the corresponding straight grooves 17. When the insertion rod 16 is inserted into the straight grooves 17, the insertion rod 16 first pushes the positioning rod 18 to move toward the outer end of the lower jaw 3, and the positioning rod 18 squeezes the first elastic member 19 (the first elastic member 19 is a component that can be telescopically reset, preferably a spring) so that the first elastic member 19 is in a compressed state. Until the positioning rod 18 moves to the position of the concave hole 21 on the insertion rod 16, under the rebound action of the first elastic member 19, the positioning rod 18 is inserted into the concave hole 21 on the insertion rod 16, so that the positioning rod 18 positions the insertion rod 16 through the concave hole 21, so that the insertion of the insertion rod 16 and the locking plate 15 in the slot 14 is more stable.

[0048] In another embodiment provided by the present invention, two sliding grooves 22 are symmetrically provided on the inner walls on both sides of the lower jaw 3, and a U-shaped sliding plate 23 is slidably installed in each of the two sliding grooves 22. A driven round rod 24 is rotatably installed in the middle of each of the two U-shaped sliding plates 23, and a driven gear 25 is provided in the middle of each of the two driven round rods 24. An active rack 26 is provided on the inner wall of each of the two sliding grooves 22, and the two active racks 26 are respectively engaged with their corresponding driven gears 25. An arc-shaped plate is provided on each of the two driven round rods 24. 27. The arc-shaped plate 27 is a quarter of a circle. A half-arc plate 28 is provided on the inner wall of the lower jaw 3. The half-arc plate 28 and the two arc-shaped plates 27 are combined into a complete annular structure. A movable ring 4 is placed on the half-arc plate 28 and the two arc-shaped plates 27. A hollow groove 29 is provided inside the lower jaw 3. A hydraulic cylinder body 30 is provided in the hollow groove 29. The output end of the hydraulic cylinder body 30 is connected to a U-shaped connecting plate 31. The two ends of the U-shaped connecting plate 31 are respectively connected to the two U-shaped sliding plates 23.

[0049] Specifically, after the sleeve is set on the outer wall of the steel bar and the steel bar is located inside the two limiting half-tubes 12, the steel bar is located inside the slide 22, the inner wall of the half-surface arc plate 28 and the steel bar are pressed against each other, the movable ring 4 is placed in the half-surface arc plate 28, and then the hydraulic cylinder body 30 is started to drive the U-shaped connecting plate 31 to move toward one end of the cylinder body 1, and the U-shaped connecting plate 31 synchronously drives the two U-shaped sliding plates 23 to slide along the track of the slide 22, and the U-shaped sliding plate 23 drives the driven circle The rod 24 and the arc-shaped plate 27 move toward one end of the cylinder body 1. Since the active rack 26 and the driven gear 25 are meshed with each other, in the process of the U-shaped sliding plate 23 moving toward one end of the cylinder body 1, the driven gear 25 moves along the trajectory of the active rack 26. Under the meshing action of the active rack 26, the driven gear 25 and the driven round rod 24 drive the arc-shaped plate 27 to rotate until the two arc-shaped plates 27 and the half-surface arc-shaped plate 28 are combined into a complete annular structure (such as Figure 12 The movable ring 4 and the sleeve are connected by the movable ring 4, and the movable ring 4 and the sleeve are connected by the movable ring 4.

[0050] In another embodiment provided by the present invention, two inclined grooves 32 are symmetrically opened on one side of the lower jaw 3 away from the cylinder body 1, and the ends of the two U-shaped sliding plates 23 are respectively connected to an L-shaped plate 33, and the ends of the two L-shaped plates 33 are respectively connected to a wedge-shaped plate 34, and an inclined support rod 35 is slidably installed on each of the two wedge plates 34, and the wedge plates 34 and the corresponding inclined support rods 35 are wedge-shapedly matched with each other, and the two inclined support rods 35 are respectively slidably installed in the corresponding inclined grooves 32, and the two inclined support rods 35 are respectively matched with their corresponding arc-shaped plates 27.

[0051] Specifically, in the process that the hydraulic cylinder body 30 drives the U-shaped connecting plate 31 to move toward one end of the cylinder body 1, the U-shaped connecting plate 31 synchronously drives the two U-shaped sliding plates 23 to slide along the track of the slide groove 22, the U-shaped sliding plate 23 drives the L-shaped plate 33 to move toward one end of the cylinder body 1, and the L-shaped plate 33 drives the wedge plate 34 to move toward one end of the cylinder body 1. Due to the mutual wedge-shaped cooperation between the wedge plate 34 and the corresponding oblique support rod 35, when the wedge plate 34 moves toward the cylinder body During the movement of one end of the main body 1, the wedge-shaped plate 34 drives the oblique support rod 35 to slide toward one end of the arc-shaped plate 27. When the two arc-shaped plates 27 and the half-arc plate 28 are combined into a complete annular structure, the oblique support rod 35 is pressed against the outer wall of the arc-shaped plate 27 corresponding to it, so that the oblique support rod 35 can provide support for the arc-shaped plate 27, preventing the arc-shaped plate 27 from being forced to rotate due to excessive force, thereby improving the stability of the two arc-shaped plates 27 and the half-arc plate 28 in clamping the movable ring 4.

[0052] In another embodiment provided by the present invention, an arc-shaped groove 36 is provided in each of the two arc-shaped plates 27 and the half-arc plate 28 along its arc-shaped trajectory, and each arc-shaped groove 36 is combined into an annular groove, and a plurality of extrusion grooves 37 are evenly provided in the arc-shaped groove 36 along its arc-shaped trajectory, and an extrusion block 38 is slidably installed in each of the extrusion grooves 37, and a propulsion block 39 is slidably provided at the position of the extrusion block 38 in each of the arc-shaped grooves 36, and each propulsion block 39 and its corresponding extrusion block 38 are wedge-shapedly matched with each other, and the two propulsion blocks 39 located in the middle of the half-arc plate 28 are connected by a second elastic member 40, and the other two adjacent propulsion blocks 39 are connected by an arc rod, and the propulsion blocks 39 at the two ends of the arc-shaped groove 36 on the half-arc plate 28 are connected. A driven block 41 is provided on each outer wall of the two arc-shaped plates 27, and the pushing block 39 located at the end where the two arc-shaped plates 27 abut each other and the inner wall of the arc-shaped groove 36 are connected by a third elastic member 42. A passive block 43 is provided at the end of the pushing block 39 located at one end where the two arc-shaped plates 27 and the half-surface arc plate 28 abut each other. Each of the extrusion blocks 38 and the inner wall of the corresponding extrusion groove 37 is connected by a fourth elastic member 44. A limiting groove 45 is provided on the side of the active rack 26 close to the cylinder body 1, and a movable tooth 46 is slidably provided in the limiting groove 45. A limiting round rod 47 is provided in the limiting groove 45, and the movable tooth 46 and the inner wall of the limiting groove 45 are connected by a fifth elastic member 48, and the fifth elastic member 48 is sleeved on the outer wall of the limiting round rod 47.

[0053] Specifically, after the sleeve is sleeved on the outer wall of the steel bar and the steel bar is located inside the two limiting half-tubes 12, the steel bar is located inside the slide 22. The staff places the sleeve on the half-arc plate 28, and then starts the hydraulic cylinder body 30 to drive the U-shaped connecting plate 31 to move toward one end of the cylinder body 1. The U-shaped connecting plate 31 synchronously drives the two U-shaped sliding plates 23 to slide along the track of the slide 22. The U-shaped sliding plate 23 drives the driven round rod 24 and the arc plate 27 to move toward one end of the cylinder body 1. Due to the mutual engagement between the active rack 26 and the driven gear 25, in the process of the U-shaped sliding plate 23 moving toward one end of the cylinder body 1, the driven gear 25 moves along the track of the active rack 26. Under the action, the driven gear 25 and the driven rod 24 drive the arc plate 27 to rotate until the driven gear 25 and the movable teeth 46 are engaged with each other. The U-shaped sliding plate 23 drives the movable teeth 46 to slide in the limiting groove 45 through the driven gear 25 until the movable teeth 46 slide to a position that is tightly abutted against the limiting rod 47. Synchronously, the movable teeth 46 squeeze the fifth elastic member 48 (the fifth elastic member 48 is a component that can be retracted and reset, preferably a spring) so that the fifth elastic member 48 is in a compressed state. Synchronously, in the process of the two arc plates 27 moving toward one end of the half-surface arc plate 28, when the two arc plates 27 respectively abut against the ends of the half-surface arc plate 28, the driven block 41 and the passive block 43 are in a state of tension. The two arc plates 27 and the half-surface arc plate 28 are pressed against each other, and after being pushed by the U-shaped sliding plate 23 and the two arc-shaped plates 27, the driven block 41 pushes the two push blocks 39 at the two ends of the arc-shaped groove 36 on the half-surface arc plate 28 to slide toward one end inside the arc-shaped groove 36, so that the push block 39 squeezes the second elastic member 40 (the second elastic member 40 is an original member capable of telescopic reset, preferably a spring), so that the second elastic member 40 is in a compressed state. Synchronously, the passive block 43 pushes the push block 39 at one end of the two arc plates 27 and the half-surface arc plate 28 that are in contact with each other to slide toward one end inside the arc-shaped groove 36, so that the push block 39 squeezes the third elastic member 42 (the third elastic member 42 is an original member capable of telescopic reset, preferably a spring), so that The third elastic member 42 is in a compressed state. Since the pushing block 39 and the corresponding extrusion block 38 are wedge-shapedly matched with each other, the pushing block 39 pushes the extrusion block 38 to slide toward the half-surface arc plate 28 and one end inside the two arc-shaped plates 27, so that each extrusion block 38 slides synchronously toward the inner end of the half-surface arc plate 28 and the two arc-shaped plates 27. Each extrusion block 38 squeezes the fourth elastic member 44 (the fourth elastic member 44 is an original component that can be telescopically reset, preferably a spring), so that the fourth elastic member 44 is in a compressed state. Each extrusion block 38 synchronously squeezes the sleeve, so that the sleeve is deformed under the extrusion action of each extrusion block 38, so that the sleeve connects the two steel bars synchronously.The U-shaped connecting plate 31 drives the two U-shaped sliding plates 23 to slide along the track of the slide groove 22, and the U-shaped sliding plate 23 drives the L-shaped plate 33 to move toward one end of the cylinder body 1, and the L-shaped plate 33 drives the wedge plate 34 to move toward one end of the cylinder body 1. Due to the mutual wedge-shaped cooperation between the wedge plate 34 and the corresponding oblique support rod 35, in the process of the wedge plate 34 moving toward one end of the cylinder body 1, the wedge plate 34 drives the oblique support rod 35 to slide toward one end of the arc plate 27. When the two arc plates 27 and the half-surface arc When the plates 28 are combined to form a complete annular structure, the oblique support rods 35 are pressed against the outer wall of the corresponding arc-shaped plate 27, so that the oblique support rods 35 can provide support for the arc-shaped plate 27, preventing the arc-shaped plate 27 from being forced to rotate due to excessive force. This improves the stability of the two arc-shaped plates 27 and the half-surface arc-shaped plate 28 in clamping the movable ring 4. In addition, the extrusion block 38 extrudes the sleeve in all directions synchronously, making the stress points of the sleeve more uniform, and preventing the sleeve from being deformed significantly and affecting its service life.

[0054] The present invention also provides a method for using a single-set double-cylinder hydraulic pliers, which is based on the above-mentioned single-set double-cylinder hydraulic pliers. The method for using the single-set double-cylinder hydraulic pliers includes the following steps:

[0055] 1. Rebar docking: After fixing the concrete foundation, put the sleeve on the outer wall of the steel bar on the foundation, move the concrete column vertically to the top of the foundation, and align the corresponding steel bars of the foundation and column;

[0056] After the cam 11 is in the air, the cam 12 is tightened and the cam 13 is tightened, so that the cam 12 is tightened and the cam 13 is tightened.

[0057] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A single-set double-cylinder hydraulic pliers, comprising a cylinder body, the cylinder body comprising a cylinder inner cavity and a cylinder outer shell, an upper jaw connected to a piston rod in the cylinder inner cavity, and a lower jaw connected to a piston rod in the cylinder outer shell, characterized in that: The two gears are connected by a plurality of gears, and the plurality of gears are connected, and the plurality of gears are connected, and the plurality of gears are connected, and the plurality of gears are connected, and the plurality of gears are connected, and the plurality of gears are connected, and the plurality of gears are connected, and the plurality of gears are connected, and the plurality of gears are connected, and the plurality of gears are connected, The two ends of the U-shaped sliding plate are connected to each other with a wedge plate at the end thereof, and an oblique support rod is slidably mounted on each of the two wedge plates, and the wedge plates and the oblique support rods corresponding thereto are wedge-shaped matched with each other. The two oblique support rods are slidably mounted in the oblique grooves corresponding thereto, and the two oblique support rods are matched with their corresponding arc plates. The movable ring is divided into a top ring for placing the sleeve and a bottom ring for extruding the sleeve, and the inner diameter of the top ring is larger than the inner diameter of the bottom ring, and the top ring and the bottom ring are connected by an oblique ring body.

2. A single-set double-cylinder hydraulic pliers according to claim 1, characterized in that: The movable ring is formed by combining a plurality of arc-shaped plates evenly arranged along its circumferential direction, and the ends of the arc-shaped plates are connected to form an integral movable ring.

3. The single-set double-cylinder hydraulic pliers according to claim 1, characterized in that: An upper opening is provided on the upper jaw, a positioning groove is provided on the inner wall of the upper jaw, and a limiting tube is arranged in the positioning groove.

4. A single-set double-cylinder hydraulic pliers according to claim 3, characterized in that: The limiting tube is composed of two limiting half tubes, and the two limiting half tubes are connected to each other through a threaded rod to form an integral limiting tube.

5. The single-set double-cylinder hydraulic pliers according to claim 3, characterized in that: The limiting tube is threadedly connected to the inner wall of the positioning groove.

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