Reinforcing steel bar connecting assembly welded to ends of reinforcing steel bars

Abstract

The invention relates to the field of steel bar connection, in particular to a steel bar connecting assembly welded to the end of a steel bar, comprising a connecting cylinder including an upper connecting cylinder and a lower connecting cylinder; an extrusion block is arranged on the inner wall of the upper connecting cylinder; four groups of clamping assemblies are mounted on the upper end surface of the extrusion block; four groups of pushing assemblies are mounted on the outer side wall of the upper connecting cylinder; four supporting plates are fixedly mounted on the inner side wall of the lower connecting cylinder; a connecting inner cylinder is fixedly mounted in the lower connecting cylinder through a supporting plate; two annular notches are formed in the connecting inner cylinder; an upper fixing assembly and a lower fixing assembly are installed in the two annular notches. Driving assemblies are mounted on the supporting plates; a fixing ring is slidably mounted at the bottom of the driving assembly; a plurality of holding claws are fixedly mounted at the top of the connecting inner cylinder; and steel bar bodies are arranged in the upper connecting cylinder and the connecting inner cylinder. By means of the reinforcing steel bar connecting device, convenient and efficient reinforcing steel bar connection can be achieved, and bending deformation caused by uneven stress of the reinforcing steel bars is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of steel bar fixed connection, and in particular to a steel bar connection assembly welded to the end of a steel bar. Background Art

[0002] Rebar is a kind of straight or coiled steel used for concrete reinforcement. It has the characteristics of high structural strength and various shapes. It is divided into plain round steel bars, ribbed steel bars and twisted steel bars. Rebar is one of the most widely used building materials in construction. It is widely used in various construction projects, especially various large, heavy and high-rise building structures. It mainly bears tensile stress in concrete. Rebar is usually used in combination with concrete. In order to ensure the strength of the rebar joint and reduce the loss of rebar material, the rebar rolling and stripping straight thread sleeve connection is a commonly used rebar connection method.

[0003] During construction, we often encounter the situation of connecting two steel bars. At present, one end of the steel bar needs to be processed into a threaded shape, and then fixed by a threaded sleeve. Although this method is simple, it requires thread processing of the steel bar. At the same time, since the steel bar is relatively long, it is not convenient to rotate the threaded sleeve, which greatly increases the burden on the staff.

[0004] Therefore, the present invention provides a steel bar connection assembly welded to the end of a steel bar to solve the above problems. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a steel bar connection assembly welded to the end of the steel bar to solve the above-mentioned problems of inconvenient steel bar connection and uneven force on both sides of the steel bar, which may cause easy bending and deformation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A steel bar connection assembly welded to the end of a steel bar, comprises a connection tube, the connection tube comprises an upper connection tube and a lower connection tube; an extrusion block is arranged on the inner wall of the upper connection tube; four groups of clamping assemblies are installed on the upper end surface of the extrusion block; four groups of pushing assemblies are installed on the outer wall of the upper connection tube; four supporting plates are fixedly installed on the inner side wall of the lower connection tube; a connecting inner tube is fixedly installed inside the lower connection tube through the supporting plates; two annular notches are symmetrically opened on the connecting inner tube in an upper and lower manner; an upper fixing assembly and a lower fixing assembly are respectively installed in the two annular notches; a driving assembly is installed on each of the supporting plates; a fixing ring is slidably installed on the bottom of the driving assembly; a plurality of clamping claws are fixedly installed in an annular shape on the top of the connecting inner tube; a steel bar body is arranged in the upper connection tube and the connecting inner tube.

[0007] Preferably, the extrusion block is arranged in a ring shape; the extrusion block is fixedly installed below the middle part of the upper connecting tube, and the shape of the vertical cross section of the extrusion block is an inverted right triangle.

[0008] Preferably, the four groups of pushing components include four pushing frames opened on the outer wall of the upper connecting cylinder; each of the pushing frames is vertically equipped with a pushing spring; a U-shaped block is slidably installed on the side wall of the pushing frame; the other end of the pushing spring is fixedly connected to the U-shaped block; a pushing plate is fixedly installed on the outer side of the U-shaped block; and a pushing rod is fixedly and horizontally installed on the pushing plate.

[0009] Preferably, the clamping assembly includes a clamping drive rod arranged in each of the pushing frames; an arc-shaped clamping block is fixedly installed on the inner end of each of the clamping drive rods; four groups of slide grooves are arranged on the upper end surface of the extrusion block; the bottom of each of the arc-shaped clamping blocks is slidably installed in the slide groove; a group of clamping springs are symmetrically installed in the middle of the outer side of each of the arc-shaped clamping blocks; the other end of the clamping spring is fixedly connected to the inner side wall of the upper connecting tube; a limiting plate is fixedly installed on the outer end of each of the clamping drive rods; the inner side wall of the limiting plate is in contact with the outer side wall of the pushing plate.

[0010] Preferably, the upper fixed components are evenly arranged in four groups; each group of upper fixed components includes a pair of upper drive gears rotatably mounted on each of the support plates; each pair of upper drive gears is coaxially rotatably mounted on the support plate through a gear shaft; an upper horizontal slide groove is provided on one side of the support plate and above the upper drive gear; an upper rack is slidably mounted in the upper horizontal slide groove; the upper rack is meshed with the upper drive gear on the same side; an upper fixed frame is fixedly mounted on the inner end of the upper rack; and a buffer assembly is installed on the upper fixed frame.

[0011] Preferably, the lower fixing components are evenly arranged in four groups; each group of lower fixing components includes a pair of lower driving gears rotatably mounted on each of the supporting plates; each pair of the lower driving gears is coaxially rotatably mounted on the supporting plate through a gear shaft; a lower horizontal slide groove is provided on one side of the supporting plate and above the lower driving gear; a lower rack is slidably mounted in the lower horizontal slide groove; the lower rack is meshed with the lower driving gear on the same side thereof; a lower fixing frame is fixedly mounted on the inner end of the lower rack; and a buffer component is installed in the lower fixing frame.

[0012] Preferably, the buffer assembly includes a buffer box slidably installed in the upper fixed frame and the lower fixed frame; a cavity is provided inside the buffer box; a buffer spring is installed in the cavity; one end of the buffer spring is fixedly connected to the interior of the buffer box; and the other end of the buffer spring is connected to the upper fixed frame and the lower fixed frame.

[0013] Preferably, the driving assembly includes a vertical slide groove opened on each of the supporting plates; a driving rod is slidably installed in the vertical slide groove; the driving rod and the upper rack and the lower rack are respectively located on both sides of the supporting plate; two driving racks are installed on the driving rod, and the interval between the two driving racks is equal to the distance between the upper driving gear and the lower driving gear; the two driving racks are respectively meshed with the upper driving gear and the lower driving gear on the same side thereof; a driving plate is fixedly installed at the bottom of the four driving rods; four supporting springs are installed at equal intervals on the upper end surface of the driving plate; the other ends of the four supporting springs are fixedly connected to the bottom of the supporting plate.

[0014] Preferably, an annular groove is provided at the bottom of the driving plate; a fixing ring is slidably installed in the annular groove; a fixing cylinder with an external thread is fixedly installed on the inner edge of the fixing ring; an internal thread is provided on the inner wall of the bottom of the connecting inner cylinder; the internal thread cooperates with the external thread.

[0015] An external connection thread is arranged on the bottom outer wall of the upper connection tube; an internal connection thread is arranged on the top inner wall of the lower connection tube; and a clamping block is fixedly arranged on the inner side of each clamping claw.

[0016] The beneficial effects of the present invention are: The present invention provides a simple and convenient connection method for connecting steel bars by arranging an upper connecting tube and a lower connecting tube, and threading the two together, and does not require threading of the steel bars, thereby reducing the cost of steel bar production and processing. The present invention provides a clamping assembly, an upper fixing assembly, and a lower fixing assembly, and cooperates with the pushing assembly and the driving assembly to fix the steel bars in the upper connecting tube and the lower connecting tube respectively, so as to facilitate subsequent installation and connection. The present invention provides a buffer assembly. When the lower driving gear and the upper driving gear continuously rotate to drive the lower rack and the upper rack to continuously slide, the buffer spring can reduce the excessive pressure brought by the lower rack and the upper rack to the steel bar body, thereby avoiding bending and deformation of the steel bar due to excessive force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main stereoscopic structure of the present invention; Figure 2 A top view of the present invention Figure 3 For the present invention Figure 2 Main cross-sectional view in the AA direction; Figure 4 For the present invention Figure 2 Stereoscopic cross-section in the AA direction; Figure 5 It is a front view of the present invention; Figure 6 For the present invention Figure 5 Top view cross section in the middle BB direction; Figure 7 For the present invention Figure 5 Top view cross section in the middle DD direction; Figure 8 For the present invention Figure 5 Side cross-sectional view in the mid-CC direction; Fig. 9 For the present invention Figure 4 The enlarged view of point A in the middle; Fig.10 It is a three-dimensional structural diagram of the buffer component in the present invention; Fig.11 It is the front view of the buffer component in the present invention.

[0018] In the figure: 1. Connecting tube; 2. Upper connecting tube; 3. Lower connecting tube; 4. Extrusion block; 5. Clamping assembly; 6. Pushing assembly; 7. Support plate; 8. Connecting inner tube; 9. Annular notch; 10. Upper fixing assembly; 11. Lower fixing assembly; 12. Driving assembly; 13. Fixing ring; 14. Clamping claw; 15. Steel bar body; 16. Pushing frame; 17. Pushing spring; 18. U-shaped block; 19. Pushing plate; 20. Pushing rod; 21. Arc clamping block; 22. Slide; 23. Clamping spring; 24. Limiting plate; 25. Upper driving gear; 26 , upper horizontal slide groove; 27, upper rack; 28, upper fixed frame; 29, buffer assembly; 30, lower drive gear; 31, lower horizontal slide groove; 32, lower rack; 33, lower fixed frame; 34, buffer box; 35, cavity; 36, buffer spring; 37, vertical slide groove; 38, drive rod; 39, drive rack; 40, drive plate; 41, support spring; 42, annular slide groove; 43, external thread; 44, fixed cylinder; 45, internal thread; 46, external connecting thread; 47, internal connecting thread; 48, clamping block; 49, clamping drive rod. DETAILED DESCRIPTION

[0019] The following will refer to the attached Figures 1 to 11 The embodiments of the present invention are described in detail. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0020] A steel bar connection assembly welded to the end of a steel bar, as shown in the attached Figure 1 To Attachment Fig.11As shown, it includes a connecting tube 1, which includes an upper connecting tube 2 and a lower connecting tube 3; an extrusion block 4 is arranged on the inner wall of the upper connecting tube 2; four groups of clamping components 5 are installed on the upper end surface of the extrusion block 4; four groups of pushing components 6 are installed on the outer wall of the upper connecting tube 2; four supporting plates 7 are fixedly installed on the inner wall of the lower connecting tube 3; a connecting inner tube 8 is fixedly installed inside the lower connecting tube 3 through the supporting plates 7; two annular notches 9 are symmetrically opened on the connecting inner tube 8 in an upper and lower manner; an upper fixing component 10 and a lower fixing component 11 are respectively installed in the two annular notches 9; a driving component 12 is installed on each of the supporting plates 7; a fixing ring 13 is slidably installed at the bottom of the driving component 12; a plurality of clamping claws 14 are fixedly installed in a ring shape on the top of the connecting inner tube 8; a steel bar body 15 is arranged in the upper connecting tube 2 and the connecting inner tube 8.

[0021] During specific use, first insert the two steel bar bodies 15 to be connected into the upper connecting tube 2 and the connecting inner tube 8 respectively, and make the lower end of the steel bar body 15 in the upper connecting tube 2 flush with the bottom of the upper connecting tube 2, and make the upper end of the steel bar body 15 in the connecting inner tube 8 flush with the top of the connecting inner tube 8; then adjust the pushing component 6 to make the clamping component 5 clamp and fix the steel bar body 15 in the upper connecting tube 2, and adjust the driving component 12 to make the upper fixing component 10 and the lower fixing component 11 fix the steel bar body 15 located in the connecting inner tube 8; then screw the bottom of the upper connecting tube 2 into the lower connecting tube 3, and the extrusion block 4 squeezes the clamping claw 14 inwardly during the downward movement of the upper connecting tube 2 so that it clamps the steel bar body 15 in the upper connecting tube 2, thereby further strengthening the connection between the two steel bar bodies 15.

[0022] As attached Figure 1 , Attachment Figure 3 To Attachment Figure 4 As shown, the extrusion block 4 is arranged in a ring shape; the extrusion block 4 is fixedly installed below the middle portion of the upper connecting tube 2, and the shape of the vertical cross section of the extrusion block 4 is an inverted right triangle.

[0023] During specific use, since the vertical cross-section of the extrusion block 4 is in the shape of an inverted right triangle, the extrusion block 4 will squeeze the clamping claws 14 inwards as it moves downward with the upper connecting tube 2, so that the clamping claws 14 clamp the steel bar body 15 in the upper connecting tube 2.

[0024] As attached Figure 1 , Attachment Figure 4 , Attachment Figure 8 , Attachment Fig. 9As shown, the four groups of pushing components 6 include four pushing frames 16 opened on the outer wall of the upper connecting tube 2; a pushing spring 17 is vertically installed in each of the pushing frames 16; a U-shaped block 18 is slidably installed on the side wall of the pushing frame 16; the other end of the pushing spring 17 is fixedly connected to the U-shaped block 18; a pushing plate 19 is fixedly installed on the outer side of the U-shaped block 18; and a pushing rod 20 is fixedly and horizontally installed on the pushing plate 19.

[0025] As attached Figure 2 , Attachment Figure 8 , Attachment Fig. 9 As shown, the clamping assembly 5 includes a clamping drive rod 49 arranged in each of the pushing frames 16; an arc-shaped clamping block 21 is fixedly installed at the inner end of each of the clamping drive rods 49; four groups of slide grooves 22 are arranged on the upper end surface of the extrusion block 4; the bottom of each of the arc-shaped clamping blocks 21 is slidably installed in the slide groove 22; a group of clamping springs 23 are symmetrically installed in the middle of the outer side of each of the arc-shaped clamping blocks 21; the other end of the clamping spring 23 is fixedly connected to the inner side wall of the upper connecting tube 2; a limiting plate 24 is fixedly installed at the outer end of each of the clamping drive rods 49; the inner side wall of the limiting plate 24 is in contact with the outer side wall of the pushing plate 19.

[0026] During specific use, first press the push rod 20 downward to completely separate the outer wall of the push plate 19 from the inner wall of the limit plate 24, and then drive the clamping drive rod 49 and the arc-shaped clamping block 21 as a whole to move toward the direction close to the steel bar body 15 under the pulling force of the clamping spring 23, thereby fixing the steel bar body 15 in the upper connecting tube 2 to prevent it from sliding; in addition, if further reinforcement is required, a welding device can be used to weld the steel bar body 15 to the upper connecting tube 2 from the top of the upper connecting tube 2.

[0027] As attached Figure 4 , Attachment Figure 6 To Attachment Fig.11 As shown, the upper fixed components 10 are evenly arranged in four groups; each group of upper fixed components 10 includes a pair of upper driving gears 25 rotatably mounted on each of the support plates 7; each pair of the upper driving gears 25 are coaxially rotatably mounted on the support plate 7 through a gear shaft; an upper horizontal slide groove 26 is provided on one side of the support plate 7 and above the upper driving gears 25; an upper rack 27 is slidably mounted in the upper horizontal slide groove 26; the upper rack 27 is meshed with the upper driving gear 25 on the same side thereof; an upper fixed frame 28 is fixedly mounted on the inner end of the upper rack 27; and a buffer component 29 is installed in the upper fixed frame 28.

[0028] As attached Figure 4 , Attachment Figure 6 To Attachment Fig.11As shown, the lower fixing components 11 are evenly arranged in four groups; each group of the lower fixing components 11 includes a pair of lower driving gears 30 rotatably mounted on each of the supporting plates 7; each pair of the lower driving gears 30 is coaxially rotatably mounted on the supporting plate 7 through a gear shaft; a lower horizontal slide groove 31 is provided on one side of the supporting plate 7 and above the lower driving gears 30; a lower rack 32 is slidably mounted in the lower horizontal slide groove 31; the lower rack 32 is meshed with the lower driving gear 30 on the same side thereof; a lower fixing frame 33 is fixedly mounted on the inner end of the lower rack 32; and a buffer component 29 is installed in the lower fixing frame.

[0029] As attached Figure 6 To Attachment Figure 7 , Attachment Fig.10 To Attachment Fig.11 As shown, the buffer assembly 29 includes a buffer box 34 slidably installed in the upper fixed frame 28 and the lower fixed frame 33; a cavity 35 is provided inside the buffer box 34; a buffer spring 36 is installed in the cavity 35; one end of the buffer spring 36 is fixedly connected to the inside of the buffer box 34; the other end of the buffer spring 36 is connected to the upper fixed frame 28 and the lower fixed frame 33.

[0030] As attached Figure 3 To Attachment Figure 4 , Attachment Figure 6 To Attachment Figure 7 As shown, the driving assembly 12 includes a vertical slide groove 37 opened on each of the supporting plates 7; a driving rod 38 is slidably installed in the vertical slide groove 37; the driving rod 38 and the upper rack 27 and the lower rack 32 are respectively located on both sides of the supporting plate 7; two driving racks 39 are installed on the driving rod 38, and the interval between the two driving racks 39 is equal to the distance between the upper driving gear 25 and the lower driving gear 30; the two driving racks 39 are respectively meshed with the upper driving gear 25 and the lower driving gear 30 on the same side thereof; a driving plate 40 is fixedly installed at the bottom of the four driving rods 38; four supporting springs 41 are installed at equal intervals on the upper end surface of the driving plate 40; the other ends of the four supporting springs 41 are fixedly connected to the bottom of the supporting plate 7.

[0031] As attached Figure 3 To Attachment Figure 4 As shown, an annular groove 42 is provided at the bottom of the driving plate 40; a fixing ring 13 is slidably installed in the annular groove 42; a fixing cylinder 44 with an external thread 43 is fixedly installed on the inner edge of the fixing ring 13; an internal thread 45 is provided on the inner wall of the bottom of the connecting inner cylinder 8; the internal thread 45 cooperates with the external thread 43.

[0032] As attached Figure 8As shown, an external connection thread 46 is provided on the bottom outer wall of the upper connection tube 2; an internal connection thread 47 is provided on the top inner wall of the lower connection tube 3; and a clamping block 48 is fixedly provided on the inner side of each clamping claw 14.

[0033] When in use, the fixing ring 13 is screwed into the bottom of the connecting inner tube 8, and the four driving rods 38 are driven to slide upward in the vertical slide groove 37, which further drives the lower driving gear 30 and the upper driving gear 25 to rotate in turn, thereby driving the lower rack 32 and the upper rack 27 to move in the direction close to the steel bar body 15, thereby driving the two fixing frames to fix the steel bar body 15. When the lower driving gear 30 and the upper driving gear 25 continue to rotate, thereby driving the lower rack 32 and the upper rack 27 to slide continuously, the buffer spring 36 can reduce the excessive pressure on the steel bar body 1 brought by the lower rack 32 and the upper rack 27, and avoid bending and deformation of the steel bar due to excessive force; if further reinforcement is required, a welding device can be used to weld the fixing ring 13 and the steel bar body 15 together from the bottom of the lower connecting tube 2.

[0034] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A steel bar connection assembly welded to the end of a steel bar, comprising a connection tube (1), characterized in that: The connecting tube (1) comprises an upper connecting tube (2) and a lower connecting tube (3); an extrusion block (4) is arranged on the inner wall of the upper connecting tube (2); four groups of clamping components (5) are installed on the upper end surface of the extrusion block (4); four groups of pushing components (6) are installed on the outer side wall of the upper connecting tube (2); four supporting plates (7) are fixedly installed on the inner side wall of the lower connecting tube (3); a connecting inner tube (8) is fixedly installed inside the lower connecting tube (3) through the supporting plate (7); Two annular notches (9) are symmetrically provided on the inner tube (8); an upper fixing assembly (10) and a lower fixing assembly (11) are respectively installed in the two annular notches (9); a driving assembly (12) is installed on each of the support plates (7); a fixing ring (13) is slidably installed at the bottom of the driving assembly (12); a plurality of clamping claws (14) are fixedly installed in an annular shape on the top of the connecting inner tube (8); and a steel bar body (15) is provided in the upper connecting tube (2) and the connecting inner tube (8).

2. A steel bar connection assembly welded to the end of a steel bar according to claim 1, characterized in that: The extrusion block (4) is arranged in a ring shape; the extrusion block (4) is fixedly installed below the middle part of the upper connecting tube (2), and the vertical cross-section of the extrusion block (4) is in the shape of an inverted right triangle.

3. A steel bar connection assembly welded to the end of a steel bar according to claim 2, characterized in that: The four groups of pushing components (6) include four pushing frames (16) opened on the outer wall of the upper connecting tube (2); each pushing frame (16) is vertically installed with a pushing spring (17); a U-shaped block (18) is slidably installed on the side wall of the pushing frame (16); the other end of the pushing spring (17) is fixedly connected to the U-shaped block (18); a pushing plate (19) is fixedly installed on the outer side of the U-shaped block (18); and a pushing rod (20) is fixedly and horizontally installed on the pushing plate (19).

4. A steel bar connection assembly welded to the end of a steel bar according to claim 3, characterized in that: The clamping assembly (5) includes a clamping drive rod (49) arranged in each of the pushing frames (16); an arc-shaped clamping block (21) is fixedly installed at the inner end of each of the clamping drive rods (49); four groups of slide grooves (22) are arranged on the upper end surface of the extrusion block (4); the bottom of each of the arc-shaped clamping blocks (21) is slidably installed in the slide groove (22); a group of clamping springs (23) are symmetrically installed in the middle of the outer side of each of the arc-shaped clamping blocks (21); the other end of the clamping spring (23) is fixedly connected to the inner side wall of the upper connecting tube (2); a limiting plate (24) is fixedly installed at the outer end of each of the clamping drive rods (49); the inner side wall of the limiting plate (24) is in contact with the outer side wall of the pushing plate (19).

5. A steel bar connection assembly welded to the end of a steel bar according to claim 4, characterized in that: The upper fixing components (10) are evenly arranged in four groups; each group of the upper fixing components (10) includes a pair of upper driving gears (25) rotatably mounted on each of the supporting plates (7); each pair of the upper driving gears (25) is coaxially rotatably mounted on the supporting plate (7) via a gear shaft; an upper horizontal slide groove (26) is provided on one side of the supporting plate (7) and above the upper driving gears (25); an upper rack (27) is slidably mounted in the upper horizontal slide groove (26); the upper rack (27) is meshed with the upper driving gear (25) on the same side; an upper fixing frame (28) is fixedly mounted on the inner end of the upper rack (27); and a buffer component (29) is installed in the upper fixing frame (28).

6. A steel bar connection assembly welded to the end of a steel bar according to claim 5, characterized in that: The lower fixing components (11) are evenly arranged in four groups; each group of the lower fixing components (11) includes a pair of lower driving gears (30) rotatably mounted on each of the supporting plates (7); each pair of the lower driving gears (30) is coaxially rotatably mounted on the supporting plate (7) via a gear shaft; a lower horizontal slide groove (31) is provided on one side of the supporting plate (7) and above the lower driving gears (30); a lower rack (32) is slidably mounted in the lower horizontal slide groove (31); the lower rack (32) is meshed with the lower driving gear (30) on the same side thereof; a lower fixing frame (33) is fixedly mounted on the inner end of the lower rack (32); and a buffer component (29) is mounted in the lower fixing frame.

7. A steel bar connection assembly welded to the end of a steel bar according to claim 6, characterized in that: The buffer assembly (29) comprises a buffer box (34) slidably installed in an upper fixed frame (28) and a lower fixed frame (33); a cavity (35) is arranged inside the buffer box (34); a buffer spring (36) is installed in the cavity (35); one end of the buffer spring (36) is fixedly connected to the inside of the buffer box (34); and the other end of the buffer spring (36) is connected to the upper fixed frame (28) and the lower fixed frame (33).

8. A steel bar connection assembly welded to the end of a steel bar according to claim 7, characterized in that: The driving assembly (12) comprises a vertical slide groove (37) provided on each of the supporting plates (7); a driving rod (38) is slidably mounted in the vertical slide groove (37); the driving rod (38) and the upper rack (27) and the lower rack (32) are respectively located on both sides of the supporting plate (7); two driving racks (39) are mounted on the driving rod (38), and the interval between the two driving racks (39) is equal to the distance between the upper driving gear (25) and the lower driving gear (30); the two driving racks (39) are respectively meshed with the upper driving gear (25) and the lower driving gear (30) on the same side thereof; a driving plate (40) is fixedly mounted at the bottom of the four driving rods (38); four supporting springs (41) are evenly spaced and mounted on the upper end surface of the driving plate (40); the other ends of the four supporting springs (41) are fixedly connected to the bottom of the supporting plate (7).

9. A steel bar connection assembly welded to the end of a steel bar according to claim 8, characterized in that: An annular groove (42) is provided at the bottom of the driving plate (40); a fixing ring (13) is slidably installed in the annular groove (42); a fixing cylinder (44) with an external thread (43) is fixedly installed on the inner edge of the fixing ring (13); an internal thread (45) is provided on the inner wall of the bottom of the connecting inner cylinder (8); the internal thread (45) and the external thread (43) cooperate with each other.

10. A steel bar connection assembly welded to the end of a steel bar according to claim 9, characterized in that: An external connection thread (46) is provided on the bottom outer wall of the upper connection tube (2); an internal connection thread (47) is provided on the top inner wall of the lower connection tube (3); and a clamping block (48) is fixedly provided on the inner side of each clamping claw (14).

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