Extrusion device for multiple rows of reinforcing steel bars

Abstract

An extrusion device for multiple rows of reinforcing steel bars comprises two opposite force arms, a connector used for connecting the two force arms and a driver. One end of the driver is fixed to the force arm connecting end on one side, and the other end of the driver is fixed to the force arm connecting end on the other side. The middle parts of the two force arms are rotatably connected with the two ends of the connector respectively, and the driver drives the connecting ends of the two force arms to expand or shrink, so that the extrusion ends of the two force arms approach or leave; a guide groove is formed in the extrusion end of the force arm, and steel bars needing to be connected are guided into the guide groove. The thickness of the guide groove is smaller than the distance between two adjacent columns of steel bars needing to be connected, and the length of the guide groove is larger than the distance between two or more adjacent pairs of steel bars of the same column of steel bars. The extrusion end of the extrusion device can extend into two or more pairs of adjacent steel bars in the same column, so that the extrusion device can be used for connecting multiple rows and columns of steel bars.

Description

Technical Field

[0001] This utility model relates to a device for connecting steel bars in building structures. Background Technology

[0002] Existing mechanical threaded connections for reinforcing bars in building structures include tapered thread connections, upset straight thread connections, and rolled straight thread connections. These methods involve processing the two reinforcing bars using specialized equipment to create threaded ends. A connecting sleeve with the corresponding internal thread is then used to connect the two bars. During connection, the connecting sleeve is first screwed onto one reinforcing bar's threaded end, and then the other reinforcing bar is screwed into the sleeve and tightened. This allows the two reinforcing bars to transfer force. Since at least one reinforcing bar must both rotate and move axially during the connection process, existing methods are only suitable for connecting single reinforcing bars.

[0003] With the development of the construction industry and the continuous improvement of construction technology, modular construction of reinforcing steel components is gradually being adopted in building construction. This involves fabricating multiple reinforcing steel bars into a single reinforcing mesh or cage before connecting them. In this type of component connection, the reinforcing steel bars can only move axially, not rotate, and certainly not move locally. Therefore, existing reinforcing steel connection methods cannot achieve a complete connection of reinforcing steel components. For example, in existing prefabricated building technology, because the exposed reinforcing steel bars of components cannot rotate, existing mechanical steel connection technologies cannot achieve steel bar connections. In prefabricated buildings, steel bar connections between components can only be achieved using grouting sleeves. However, grouting sleeves are expensive, the construction process is cumbersome and complex, and the quality of grouting directly affects the project quality, making it difficult to guarantee the quality of the steel bar connections.

[0004] Because existing building structures often contain multiple rows and columns of reinforcing bars with small distances between them, when they need to be connected, the obstruction caused by the multiple rows and columns of reinforcing bars prevents ordinary extrusion devices used for single rows of reinforcing bars from reaching into the bars. Therefore, ordinary extrusion devices cannot be used to connect reinforcing bars. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the above-mentioned deficiencies of the prior art and provide a compression device for multiple rows of steel bars, which can be used in the connection of multiple rows and columns of steel bars.

[0006] The technical solution adopted by this utility model to solve the above problems is as follows:

[0007] A pressing device for multiple rows of reinforcing bars, characterized in that: it includes two opposing lever arms, a connector for connecting the two lever arms, and a driver; one end of the driver is fixed to the connecting end of one lever arm, and the other end of the driver is fixed to the connecting end of the other lever arm; the middle parts of the two lever arms are rotatably connected to the two ends of the connector, and the connecting ends of the two lever arms are expanded or contracted by the driver, so that the pressing ends of the two lever arms approach or move away; the pressing end of the lever arm is provided with a guide groove to guide the reinforcing bars to be connected into the guide groove; the thickness of the guide groove is less than the distance between two adjacent rows of reinforcing bars to be connected, and the length of the guide groove is greater than the distance between two or more adjacent pairs of reinforcing bars in the same row.

[0008] Even better, a U-shaped mold is provided on the inner side of the extrusion end, and the U-shaped mold limits the sleeve of the steel bar connecting assembly, which can better extrude.

[0009] More specifically, the actuator is a hydraulic cylinder, the outer end of the piston rod of the hydraulic cylinder is fixed to the lever arm connection end on one side by a fixing pin, and the other end of the hydraulic cylinder is fixed to the lever arm connection end on the other side by a fixing pin.

[0010] More specifically, each lever arm has a groove at its connecting end, and a fixing plate is connected to the outer end of the piston rod. The fixing plate is placed in the groove of one lever arm and fixed by a fixing pin. Another fixing plate is fixed at the other end of the hydraulic cylinder. The other fixing plate is placed in the groove of the other lever arm and fixed by a fixing pin.

[0011] Even better, the guide groove at the extrusion end is U-shaped.

[0012] Better still, the connector for connecting the two lever arms is two connecting plates. The two sides of the middle part of the two lever arms are respectively fixed to the ends of the two connecting plates by connecting pins. Each lever arm can rotate around the connecting pin. The piston rod of the hydraulic cylinder drives the connecting end of the two lever arms to expand or shrink, so that the pressing end of the two lever arms approaches or separates.

[0013] Even better, it also includes lifting rings, fixed in the middle of the two lever arms, which can be used to lift the extrusion device, making it easier for operators to operate.

[0014] Even better, it also includes gears, which are rotatably fixed between the two connecting plates. The two gears mesh with each other and can rotate with the lever arm, thereby increasing the supporting force between the two lever arms.

[0015] Compared with the prior art, the advantages of this utility model are as follows: Since the thickness of the guide groove of the lever arm is less than the spacing between two adjacent columns of steel bars to be connected, and the length of the guide groove is greater than the distance between two or more adjacent pairs of steel bars in the same column, the extrusion end of the extrusion device can extend into two or more adjacent pairs of steel bars in the same column, thus enabling its use in the connection of multiple rows and columns of steel bars. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of an extrusion device for multiple rows of steel bars according to an embodiment of the present invention.

[0017] Figure 2 This is a front view of an extrusion device for multiple rows of reinforcing bars according to an embodiment of the present invention.

[0018] Figure 3 This is a side view of the outer sleeve of an extrusion device for multiple rows of reinforcing bars according to an embodiment of this utility model.

[0019] Figure 4 This is a bottom view of an embodiment of the present invention of an extrusion device for multiple rows of reinforcing bars. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1-4 As shown, a pressing device for multiple rows of reinforcing bars includes two lever arms 1 with the same structure, a connecting plate 2 for connecting the two lever arms 1, and a hydraulic cylinder 3.

[0022] The hydraulic cylinder 3 is provided with an oil inlet 31 and an oil return port 32. The oil inlet 31 and the oil return port 32 are connected to an external hydraulic system, which provides reciprocating force to the hydraulic cylinder 3.

[0023] The outer end of the piston rod of the hydraulic cylinder 3 is fixed to the connecting end of the lever arm 1 on one side by a fixing pin, and the other end of the hydraulic cylinder 3 is fixed to the connecting end of the lever arm 1 on the other side by a fixing pin 6.

[0024] More specifically, the two lever arms 1 are opposite each other, and each lever arm 1 is provided with a U-shaped groove 12 at its connecting end. The outer end of the piston rod 33 is connected to a fixing plate 35. The fixing plate 35 is placed in the U-shaped groove 12 of one lever arm 1 and is fixed by a fixing pin 6. The other end of the hydraulic cylinder 3 is fixed with another fixing plate 34. The other fixing plate 34 is placed in the U-shaped groove 12 of the other lever arm 1 and is fixed by a fixing pin 6.

[0025] The extrusion end 14 of the lever arm 1 is provided with a U-shaped guide groove 13 to guide the steel bars to be connected into the U-shaped guide groove 13.

[0026] The thickness T of the U-shaped guide groove 13 is less than the spacing between two adjacent columns of reinforcing bars that need to be connected, and the length L of the U-shaped guide groove 13 is greater than the distance between two or more adjacent pairs of reinforcing bars in the same column. Therefore, the extrusion end 14 of the extrusion device can extend into two or more adjacent pairs of reinforcing bars in the same column.

[0027] A U-shaped mold is provided on the inner side of the extrusion end 14. The U-shape of the U-shaped mold is consistent with the U-shape of the U-shaped guide groove 13, allowing the reinforcing bar to enter. The U-shaped mold is aligned with the sleeve of the connecting component to be connected, so that the sleeve is positioned and moves together with the extrusion end.

[0028] The two lever arms 1 are fixed to the ends of the two connecting plates 2 by connecting pins 7 on both sides of the middle part, thereby connecting the two lever arms 1 together. Thus, each lever arm 1 can rotate around the connecting pin 7, and the connecting end of the two lever arms is expanded or contracted by the piston rod of the hydraulic cylinder, thereby causing the pressing end 14 of the two lever arms 1 to approach or move away.

[0029] It also includes a lifting ring 8, which is fixed in the middle of the two lever arms 1. The extrusion device is lifted by the lifting ring 8, making it easier for the operator to operate.

[0030] It also includes gears 4, which are fixed between the connecting plates 4 on both sides by fixing pins 9 and can rotate around the fixing pins 9. The two gears 4 mesh with each other and can rotate with the lever arm, thereby increasing the supporting force between the two lever arms 1.

[0031] like Figure 4 As shown, in use, first install the rebar connection assembly in the upper and lower rebars of the same column or row that need to be connected. The upper rebar is connected to the upper sleeve, and the lower rebar is connected to the lower sleeve. A connecting sleeve is set between the upper and lower sleeves. Then, the U-shaped guide grooves 13 of the two lever arms 1 of the extrusion device for multiple rows of rebars are respectively inserted into the upper and lower rebars. The molds 5 on the upper and lower rebars are aligned with the upper and lower sleeves, respectively. Then, the hydraulic system is turned on to supply hydraulic oil to the oil inlet 31 of the hydraulic cylinder 3, causing the piston of the hydraulic cylinder 3 to extend. This causes the connecting end of the lever arm 1 connected to it to open, reducing the distance between the extrusion ends 14 of the lever arm 1. This causes the upper and lower sleeves to move towards each other, pressing the connecting sleeve onto the reinforcing bar, thus connecting the upper and lower reinforcing bars together. After the upper and lower reinforcing bars are connected, the hydraulic system supplies hydraulic oil in the reverse direction to the return port 32 of the hydraulic cylinder 3, causing the piston rod to retract inward, reducing the distance between the connecting ends of the two lever arms, and correspondingly increasing the distance between the extrusion ends 14 of the two lever arms, thereby causing the extrusion device to leave the reinforcing bar connecting assembly.

[0032] Because the thickness T of the U-shaped guide groove 13 is less than the spacing between two adjacent rows of reinforcing bars to be connected, and the length L is greater than the distance between two or more adjacent pairs of reinforcing bars in the same row, the extrusion end of the extrusion device extends into two or more adjacent pairs of reinforcing bars in the same row. Then, following the connection process described above, the inner reinforcing bar pairs are connected first, and then the outer reinforcing bar pairs are connected. Alternatively, the connection of multiple reinforcing bar pairs can be completed simultaneously.

[0033] The aforementioned rebar connection assembly is quite common. It can be the rebar connection assembly disclosed by the applicant in Chinese patent document CN222227743U, or the rebar extrusion connection sleeve assembly disclosed in CN115233908A, etc., which will not be described in detail here.

Claims

1. An extrusion device for a plurality of rows of reinforcing steel, characterised in that: It comprises two opposite force arms, a connector for connecting the two force arms and a driver; one end of the driver is fixed on the connecting end of one side of the force arm, and the other end of the driver is fixed on the connecting end of the other side of the force arm; the middle part of the two force arms is rotatably connected with the two ends of the connector, respectively; the connecting ends of the two force arms are expanded or reduced by the driver, so that the pressing ends of the two force arms approach or leave. The pressing end of the force arm is provided with a guide groove for guiding the steel bars to be connected into the guide groove; the thickness of the guide groove is less than the distance between two adjacent rows of steel bars to be connected, and the length of the guide groove is greater than the distance between two adjacent pairs or more than two pairs of steel bars in the same row.

2. The extrusion device for multiple rows of reinforcement bars as claimed in claim 1 wherein: The inside of the pressing end is provided with a U-shaped mold for limiting the sleeve of the steel bar connecting assembly.

3. The extrusion device for multiple rows of reinforcement bars as claimed in claim 1 wherein: The driver is a hydraulic oil cylinder, and the outer end of the piston rod of the hydraulic oil cylinder is fixed on the connecting end of one side of the force arm through a fixing pin, and the other end of the hydraulic oil cylinder is fixed on the connecting end of the other side of the force arm through a fixing pin.

4. The extrusion device for multiple rows of reinforcement bars as claimed in claim 3 wherein: The connecting end of each force arm is provided with a groove, and the outer end of the piston rod is connected with a fixing plate, which is placed in the groove of one side of the force arm and fixed by a fixing pin, and the other end of the hydraulic oil cylinder is fixed with another fixing plate, which is placed in the groove of the other side of the force arm and fixed by a fixing pin.

5. The extrusion device for multiple rows of reinforcement bars as claimed in claim 1 wherein: The guide groove of the pressing end is U-shaped.

6. The extrusion device for multiple rows of reinforcement bars as claimed in claim 1 wherein: The connector for connecting the two force arms is two connecting plates, and the middle parts of the two force arms are fixed with the ends of the two connecting plates through connecting pins, respectively, and each force arm can rotate around the connecting pin, and the connecting ends of the two force arms are expanded or reduced by the piston rod of the hydraulic oil cylinder, so that the pressing ends of the two force arms approach or leave.

7. The extrusion device for multiple rows of reinforcement bars as claimed in claim 1 wherein: It also comprises a lifting ring fixed in the middle part of the two force arms, and the pressing device is lifted through the lifting ring.

8. The extrusion device for multiple rows of reinforcement bars as claimed in claim 1 wherein: It also comprises a gear rotatably fixed between the two connecting plates, and the two gears are meshed and can rotate with the force arms.

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