Straight thread tightening machine and method for steel bar sleeve screwing wrench

Abstract

The invention provides a straight thread tightening machine for a reinforcing steel bar sleeve screwing wrench, and belongs to the technical field of reinforcing steel bar tightening equipment. The tightening machine comprises a shell and a core gear assembly arranged in the shell. The core gear assembly comprises an input gear unit, an idle gear train and a double-opening gear set. By the adoption of the design of the symmetrical rotation type double-gear clamping opening, after clamping, two gears in the double-opening gear set rotate together to complete screwing of a reinforcing steel bar sleeve, torque can be transmitted more evenly, and the screwing process is more stable and efficient; the pair of gears rotate simultaneously, so that power can be better utilized, energy loss is reduced, and tightening efficiency is improved; the stability in the screwing process can be kept, and shaking and deviation are reduced; a replaceable clamping opening rubber ring is adopted in the double-opening gear set, and the double-opening gear set can adapt to steel bar sleeves of different sizes and different shapes.

Description

Technical Field

[0001] The invention relates to a tightening machine, in particular to a steel bar sleeve threading wrench tightening machine, belonging to the technical field of steel bar tightening equipment. Background Art

[0002] Steel bar sleeves, also known as steel bar joints, are used to connect steel bars and have internal threads corresponding to the thread heads. The simple construction process is to roll the ends of the steel bars into straight threads and use the corresponding connecting sleeves to connect the two steel bars. Straight thread steel bar sleeves are commonly used for steel bar connections in construction and bridge engineering.

[0003] The steel bar sleeve threading wrench tightening machine is a special tool used for steel bar connection in construction, mainly used to tighten the steel bar sleeve to connect two steel bars together. The existing steel bar threading wrench tightening machine has the following problems:

[0004] (1) Existing steel bar sleeve threading wrench tightening machines mostly adopt a single-opening gear design. This design does not form a complete gear structure, resulting in large impact and severe vibration during the meshing process when rotating the thread. This severe vibration and impact affects the stability of the machine. In addition, since the gears are easy to wear and have poor tolerance, the core components are easy to be damaged, which increases the maintenance cost and the failure rate of the machine, affecting the project progress and construction quality.

[0005] (2) The rebar sleeve threading wrench tightening machine needs to precisely control the torque to ensure that the tightening degree of the threaded connection meets the engineering requirements. The existing rebar sleeve threading wrench tightening machine has a small output torque, which limits its application in situations where high torque is required; if the output torque is insufficient, the specified tightening torque value may not be reached, affecting the safety and stability of the structure.

[0006] (3) The existing steel bar sleeve screw wrench tightening machine has a single clamping opening size and shape, which limits its scope of application. In actual construction, the diameter and shape of the steel bars to be connected may be different, and a single clamping opening cannot meet the diverse steel bar connection requirements.

[0007] (4) The power input of the existing steel bar screw wrench tightening machine is a motor powered by a lithium battery. The power input method is single and cannot meet the needs of multiple working conditions. In different construction environments, different power sources may be required to ensure the normal operation of the machine. The single power input method limits the adaptability and flexibility of the machine in different environments. Summary of the invention

[0008] In view of this, the present invention provides a steel bar sleeve thread spanner straight thread tightening machine, which can solve the problems existing in the above-mentioned existing steel bar thread spanner tightening machines.

[0009] The technical solution of the present invention is: a steel bar sleeve thread wrench straight thread tightening machine, comprising: a housing and a core gear assembly arranged inside the housing;

[0010] The core gear assembly includes: an input gear unit, an idler gear train and a double open gear set;

[0011] The power input end of the input gear unit extends out of the housing to serve as a power source connection interface;

[0012] The input gear unit is used to transmit the power of the power source to the idler gear train; the idler gear train transmits the power to the double-open gear set;

[0013] The double-opening gear set comprises: a coaxially arranged gear D and a gear E; both the gear D and the gear E are gears with single-side openings and the openings are connected to the center hole;

[0014] A coaxial circular hole is provided on the housing at a position corresponding to the central hole of the double-opening gear set, and an opening communicating with the central circular hole is provided on the front end surface;

[0015] The gear E can adjust the opening position relative to the gear D; when the steel bar sleeve to be threaded needs to be inserted, the openings of the gear D and the gear E are made to correspond to the opening positions on the shell; when threading is required, the opening of the gear E is symmetrical with the opening of the gear D along their axis to form a symmetrical double-opening gear set, and at this time, the gear D and the gear E can rotate synchronously driven by the idler gear system.

[0016] As a preferred embodiment of the present invention: on the gears D and E, a rubber sleeve is detachably installed on the inner circumference of the center hole corresponding to the opening; the outer circumference of the rubber sleeve fits with the center hole of the corresponding gear, and the inner circumference fits with the steel bar sleeve to be threaded.

[0017] As a preferred embodiment of the present invention: a plurality of pin holes for inserting pins are arranged on the end faces of the gear D and the gear E; when the pins are inserted into the pin holes, the gear D and the gear E are connected as one.

[0018] As a preferred embodiment of the present invention: the input gear unit comprises: an input rod and a gear A;

[0019] The input rod has a square head structure at one end and a cylindrical structure at the other end; the square head structure of the input rod is located outside the housing as a power source connection interface; the lower part of the cylindrical section is supported on the housing through an input deep groove ball bearing; gear A is coaxially sleeved on the cylindrical section of the input rod and is connected to the input rod key through an input gear flat key.

[0020] As a preferred embodiment of the present invention, the power source connected to the power source connection interface includes but is not limited to: a motor, an electric drill, an air drill, a hydraulic motor, and a crank.

[0021] As a preferred embodiment of the present invention: the idler gear train comprises: gear B, gear C, an idler gear shaft and an idler gear;

[0022] The idler gear shaft has a shoulder in the middle, dividing it into two shaft sections, upper and lower; its lower end is supported on the housing through an idler gear deep groove ball bearing B, and an idler gear is coaxially mounted on its lower shaft section through an idler gear flat key B; the idler gear meshes with the gear A in the input gear unit;

[0023] The gear B and gear C are coaxially arranged and connected to the upper shaft section of the idler shaft via the idler flat key A;

[0024] The top of the idler gear shaft is supported on the housing through an idler gear deep groove ball bearing A;

[0025] The gear C meshes with the gear E, and the gear B meshes with the gear D.

[0026] As a preferred embodiment of the present invention: a clutch mechanism is provided for disconnecting and connecting the power transmission route between gear D and gear E in the double-open gear set;

[0027] When the clutch mechanism is engaged, the gear D and the gear E can rotate synchronously driven by the idler gear system; when it is necessary to adjust the position of the opening on the gear E relative to the opening on the gear D, the clutch mechanism is disengaged, the gear E is rotated to adjust the opening position, and the gear D remains stationary.

[0028] As a preferred embodiment of the present invention: the housing comprises a lower box body and an upper box body connected to each other; a cavity for installing a core gear assembly is formed between the lower box body and the upper box body; and a handle is installed on the surface of the upper box body.

[0029] As a preferred embodiment of the present invention: it also includes a pin insertion and extraction tool, and a plugging and extraction hole is provided at a position corresponding to each pin on the housing;

[0030] The pin shaft insertion and extraction tool realizes the insertion and extraction of the pin shaft through the insertion and extraction hole, thereby realizing the connection and disconnection of gear D and gear E; when disconnecting, it is used to adjust the opening position of the gear E; after the gear D and gear E are disconnected, the gear E is driven to rotate through the rotating mechanism to adjust its opening position.

[0031] In addition, the present invention provides a method for tightening a straight thread of a steel sleeve with a thread spanner, using the above-mentioned steel sleeve thread spanner straight thread tightening machine,

[0032] Before working: make the openings of gear D and gear E in the double-opening gear set correspond to the opening positions on the housing, and the whole is in an open state;

[0033] When in use, the steel bar sleeve to be threaded is pushed into the double-opening gear set from the opening on the housing; then the opening of the gear E is adjusted to a position symmetrical to the opening of the gear D to form a symmetrical double-opening gear set, at which time the gear D and the gear E can rotate synchronously driven by the idler gear system;

[0034] Start the power source connected to the input gear unit, the input gear unit transmits power to the double-opening gear set through the idler gear system, drives the double-opening gear set to rotate, and then drives the steel sleeve to rotate through the rubber sleeve, and the steel sleeve is tightened;

[0035] After the tightening operation is completed, the opening of the gear D is kept consistent with the opening position on the shell; the opening of the gear E is adjusted to the same position as the opening of the shell, and the steel sleeve is removed.

[0036] Beneficial effects:

[0037] (1) The present invention adopts a symmetrical rotating double-gear clamping mouth design. After clamping, the upper gear D and the lower gear E form a complete gear, and then rotate together to complete the threading of the steel sleeve, which can transmit torque more evenly and make the tightening process more stable and efficient. A pair of gears rotate at the same time, which can better utilize power, reduce energy loss, and improve tightening efficiency. It also helps to maintain the stability of the tightening process and reduce shaking and deviation. Compared with the single gear support structure, the design of the double-open gear set can effectively solve the problems of unstable threading and easier damage.

[0038] (2) The present invention can adopt strong power input, and with the structural design of the idler wheel group, the maximum output torque can reach more than 240N·m, which is suitable for occasions with different torque requirements.

[0039] (3) The double-opening gear set of the present invention adopts a replaceable clamping rubber ring, which can adapt to steel sleeves of different sizes and shapes. It has a simple structure, is easy to replace, and has a low replacement cost.

[0040] (4) In the present invention, the power input end of the input gear unit extends out of the housing to serve as a power source connection interface; different modes of power input can be used to meet different construction requirements; for example, a matching flange motor can be used, or a handheld electric drill, pneumatic drill, hydraulic motor, or a crank can be used to manually input power.

[0041] (5) In the present invention, during operation, gear D and gear E are connected as a whole through a pin shaft, thereby improving their integrity and synchronization; and the pin shaft is inserted and removed by a pin shaft insertion and extraction tool to ensure that gear D and gear E can be connected and disconnected as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall structure of the steel bar sleeve threading wrench straight thread tightening machine of the present invention;

[0043] Figure 2 It is a structural schematic diagram of the core gear assembly in the present invention;

[0044] Figure 3 This is the exploded view of the input gear unit;

[0045] Figure 4 This is the exploded diagram of the idler gear train;

[0046] Figure 5 This is an exploded view of a double open gear set.

[0047] Among them: 1-lower housing, 2-core gear assembly, 201-input gear unit, 2011-input rod, 2012-gear A, 2013-input gear flat key, 2014-input deep groove ball bearing, 202-idler gear system, 2021-gear B, 2022-gear C, 2023-idler gear shaft, 2024-idler gear flat key A, 2025-idler gear flat key B, 2026-idler gear, 2027-idler gear deep groove ball bearing A, 2028-idler gear deep groove ball bearing B, 203-double open gear set, 2031-gear D, 2032-gear E, 2033-rubber sleeve, 2034-pin shaft, 2035-plug-in hole, 3-upper housing, 31-handle nut, 32-handle. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] The present embodiment provides a straight thread tightening machine with a steel bar sleeve threading wrench, which is mainly used for the connection and tightening of straight threaded steel bars on construction sites. For example, in the construction of building structures such as bridges and houses, the threading operation of straight threaded steel bars can be completed quickly and efficiently, thereby improving construction efficiency.

[0050] like Figure 1 As shown, the steel bar sleeve thread wrench straight thread tightening machine includes: a housing, a core gear assembly 2 and an automatic control unit (not shown in the figure).

[0051] The shell includes a lower box body 1 and an upper box body 3 connected to each other up and down; a cavity for installing the core gear assembly 2 is formed between the lower box body 1 and the upper box body 3; a handle 32 is installed on the surface of the upper box body 3 through a handle nut 31 to facilitate holding; as an example, the handle 32 is a foldable handle.

[0052] like Figure 2-Figure 5As shown, the core gear assembly 2 is arranged inside the shell, including three gear units, namely the input gear unit 201, the idler gear system 202 and the double-open gear set 203; wherein the input gear unit 201 includes: an input rod 2011 and a gear A2012; the input rod 2011 is a square-headed input rod, that is, one end is a square-headed structure and the other end is cylindrical; the cylindrical end of the input rod 2011 is inserted into the shell from the bottom of the lower box body 1, and is supported on the lower box body 1 through an input deep groove ball bearing 2014; the gear A2012 is coaxially sleeved on the part of the cylindrical end of the input rod 2011 extending into the shell, and is key-connected to the input rod 2011 through an input gear flat key 2013; thereby, the input rod 201 can drive the gear A2012 to rotate coaxially.

[0053] The square head structure of the input rod 2011 is located outside the lower box 1 as a power source connection interface, and a suitable power source can be selected according to the use scenario to realize power input; for example, a matching flange motor can be used to connect to the input rod 201, or a handheld electric drill, air drill, hydraulic motor, etc. can be used to directly connect to the input rod 201; or a crank can be used to connect to the input rod 201 to realize manual power input. Different power source designs can meet places with different construction requirements (for example, gas and liquid power are suitable for places with explosion-proof requirements; high-torque motors are suitable for places that require fast operation); the maximum output torque of this product design can reach more than 240N·m, which is suitable for places with different torque requirements.

[0054] The idler gear system 202 includes: gear B2021, gear C2022, idler shaft 2023 and idler gear 2026; the idler shaft 2023 has a shoulder in the middle, dividing it into two upper and lower shaft sections; its lower end is supported on the lower housing through an idler gear deep groove ball bearing B2028, and the idler gear 2026 is coaxially installed on its lower shaft section through an idler flat key B2025, and the idler gear 2026 is meshed with the gear A2012 in the input gear unit 201; the gear B2021 and the gear C2022 are coaxially arranged, and are connected to the upper shaft section of the idler shaft 2023 through an idler flat key A2024; the top of the idler shaft 2023 is supported on the upper housing 3 through an idler gear deep groove ball bearing A2027.

[0055] The double-opening gear set 203 includes: gear D2031 and gear E2032; gear D2031 and gear E2032 are both single-sided opening gears, the opening is connected to the center hole of gear D2031 and gear E2032; gear D2031 and gear E2032 have the same opening size; when in use, gear D2031 and gear E2032 are coaxially placed and the openings are symmetrical. Gear D2031 meshes with gear B2021 in the idler gear train, and gear E2032 meshes with gear C2022 in the idler gear train.

[0056] Coaxial circular holes are provided on the lower box body 1 and the upper box body 3 at positions corresponding to the center holes of the gear D2031 and the gear E2032; and the front end surfaces of the lower box body 1 and the upper box body 3 are provided with openings connected to the center circular holes thereof, and the openings are consistent with the opening sizes of the two gears in the double-opening gear set 203; thus, when the two openings of the gear D2031 and the gear E2032 are aligned with the opening positions on the shell, the steel sleeve can be coaxially placed into the center holes of the gear D2031 and the gear E2032; when the two openings of the gear D2031 and the gear E2032 are symmetrically arranged, a symmetrical double-opening gear set is formed.

[0057] The center hole on the upper end face of gear D2031 has an annular stopper with a notch extending upward (the notch corresponds to the opening of gear D2031), and the stopper extends from the center hole of upper housing 3. The center hole on the lower end face of gear E2032 has an annular stopper with a notch extending downward (the notch corresponds to the opening of gear E2032), and the stopper extends from the center hole of lower housing 1; thus, gears D2031 and E2032 are limited by incomplete circular holes on the end faces and lubricated regularly.

[0058] A rubber sleeve 2033 is installed on the inner circumferential surface of the center hole corresponding to the openings of gear D2031 and gear E2032 (a limiting groove is directly set on the inner circumferential surface of the center hole corresponding to the openings of gear D2031 and gear E2032 to install the rubber sleeve 2033, which is easy to replace) as a clamping rubber ring. The outer circumferential surface of the rubber sleeve 2033 fits with the center hole of the corresponding gear, and the inner circumferential surface fits with the steel bar sleeve to be threaded. The rubber sleeve 2033 of appropriate shape and size can be selected according to the shape of the steel bar sleeve to adapt to steel bar sleeves of different sizes and shapes.

[0059] The automatic control unit includes: a rotating mechanism and a clutch mechanism; the rotating mechanism is used to drive the gear E2032 in the double-opening gear set 203 to rotate so as to adjust its relative position with the gear D2031 (the rotating mechanism is only used when adjusting the position of the gear E2032, and is disconnected from the gear E2032 when not in use). The clutch mechanism is used to disconnect and connect the power transmission route between the gear D2031 and the gear E2032 in the double-opening gear set 203, so that the gear D2031 and the gear E2032 can be separated from each other or rotated together as needed. That is, when the clutch mechanism is engaged, the gear D2031 and the gear E2032 can rotate synchronously; when it is necessary to adjust the position of the opening on the gear E2032 relative to the opening on the gear D2031 so that the openings are staggered, the clutch mechanism is separated, and at this time the rotating mechanism drives the gear E2032 to rotate, while the gear D2031 remains stationary.

[0060] As one example, the rotating mechanism uses a rotating motor.

[0061] As an example, the clutch mechanism is arranged between the idler gear system 202 and the double-open gear set 203; or the gear B2021 in the idler gear system 202 is installed on the idler shaft 2023 through the clutch mechanism; or the gear C2022 of the idler gear system 202 is installed on the idler shaft 2023 through the clutch mechanism; it is only necessary to ensure that when the clutch mechanism is in the disengaged state, the rotating mechanism drives the gear E2032 to rotate, and will not drive the gear D2031 to rotate synchronously.

[0062] As an example, in order to improve the integrity and synchronization of gear D2031 and gear E2032 (there are gaps between the teeth of the gears, which may cause instability during rotation); a number of pin holes for inserting pin shafts 2034 are correspondingly arranged on the end faces of gear D2031 and gear E2032, so that gear D2031 and gear E2032 can be connected as a whole through a number of pin shafts 2034 that cooperate with the pin holes, forming a symmetrical double-open gear set.

[0063] On this basis, in order to ensure that gear D2031 and gear E2032 can be independent of each other, the opening position of gear E2032 can be adjusted; a plug-in hole 2035 is provided on the upper box body 3 at a position corresponding to each pin shaft 2034, and the plug-in hole is a waist-shaped hole; the pin shaft plug-in and pull-out tool realizes the plug-in and pull-out of the pin shaft 2034 through the plug-in and pull-out hole 2035, thereby realizing the connection and disconnection of gear D2031 and gear E2032.

[0064] As an example, the pin shaft plugging and pulling tool uses a linear motor, and uses the telescopic movement of the linear motor actuator end to drive the pin shaft 2034 to move linearly, so as to control the pin shaft 2034 to be plugged and pulled out as needed. In this case, the linear motor used for pin shaft plugging and pulling out can also be used as part of the automatic control unit (the linear motor used for pin shaft plugging and pulling out is only used when plugging and pulling out the pin shaft 2034, and is disconnected from the pin shaft 2034 when not in use).

[0065] The operating principle of the tightening machine is:

[0066] During installation, mesh the gear A2012 of the input gear unit 201 with the idler gear 2026 of the idler gear train 202; mesh the gear B2021 and gear C2022 of the idler gear train 202 with the gear D2031 and gear E2032 in the double-open gear set 203 respectively, and then install them to the corresponding positions of the housing.

[0067] Pre-working state: the openings of gear D2031 and gear E2032 in the double-opening gear set 203 are both located directly in front of the user (i.e. corresponding to the opening positions on the housing, and the whole is in an open state); and the clutch mechanism is in a disengaged state, disconnecting the power transmission route between gear D2031 and gear E2032; at the same time, the pin shaft 2024 is not inserted to ensure that gear D2031 and gear E2032 are independent of each other.

[0068] When in use, push the steel bar sleeve to be threaded into the double-opening gear set 203 from the opening on the housing, and ensure that the rubber sleeve 2033 clamps the steel bar sleeve. Then use the rotating mechanism to drive the gear E2032 located below to rotate to a position where the opening is symmetrical with the opening of the gear D2031 above; during this process, the gear D2031 remains stationary; after adjusting to the right position, disconnect the connection between the rotating mechanism and the gear E2032; at this time, use the pin shaft insertion and extraction tool to insert the pin shaft 2034 to fix the gear D2031 and the gear E2032 to make them a complete gear; then the clutch mechanism is engaged.

[0069] Turn on the switch of the power source connected to the input rod 2011, so that the input gear unit 201 transmits power to the double-open gear set 203 through the idler gear system 202, driving the double-open gear set 203 to rotate, and then driving the steel sleeve to rotate through the rubber sleeve 2033, so that the steel sleeve is tightened.

[0070] After the tightening operation is completed, the opening of the upper gear D2031 is aligned with the opening position on the housing; then the clutch mechanism is in a disengaged state, disconnecting the power transmission route between gear D2031 and gear E2032; use the pin shaft plug-in tool to pull out the pin shaft 2034 to separate gear D2031 and gear E2032; use the rotating mechanism to drive the gear E2032 located below to rotate until the opening is at the same position as the opening of the upper gear D2031 (open state). At this time, remove the steel bar sleeve that has been threaded, and complete the whole set of operations.

[0071] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A steel bar sleeve thread wrench straight thread tightening machine, characterized in that: include: A housing and a core gear assembly (2) arranged inside the housing; The core gear assembly (2) comprises: an input gear unit (201), an idler gear train (202) and a double-open gear set (203); The power input end of the input gear unit (201) extends out of the housing to serve as a power source connection interface; The input gear unit (201) is used to transmit the power of the power source to the idler gear train (202); the idler gear train (202) transmits the power to the double-open gear set (203); The double-opening gear set (203) comprises: a coaxially arranged gear D (2031) and a gear E (2032); the gear D (2031) and the gear E (2032) are both gears with single-side openings and the openings are connected to the center hole; A coaxial circular hole is provided on the housing at a position corresponding to the central hole of the double-opening gear set (203), and an opening communicating with the central circular hole is provided on the front end surface; The gear E (2032) can adjust the opening position relative to the gear D (2031); when a steel bar sleeve to be threaded needs to be inserted, the openings of the gear D (2031) and the gear E (2032) are made to correspond to the opening positions on the housing; when threading needs to be performed, the opening of the gear E (2032) and the opening of the gear D (2031) are symmetrical along their axes to form a symmetrical double-opening gear set, and at this time, the gear D (2031) and the gear E (2032) can rotate synchronously under the drive of the idler gear system (202).

2. The steel bar sleeve thread wrench straight thread tightening machine according to claim 1, characterized in that: On the gear D (2031) and the gear E (2032), a rubber sleeve (2033) is detachably mounted on the inner circumference of the center hole corresponding to the opening; the outer circumference of the rubber sleeve (2033) fits with the center hole of the corresponding gear, and the inner circumference fits with the steel bar sleeve to be threaded.

3. The steel bar sleeve thread wrench straight thread tightening machine according to claim 1, characterized in that: A plurality of pin holes for inserting the pin shaft (2034) are arranged on the end surfaces of the gear D (2031) and the gear E (2032); when the pin shaft (2034) is inserted into the pin hole, the gear D (2031) and the gear E (2032) are connected as one.

4. The steel bar sleeve thread wrench straight thread tightening machine as claimed in claim 1, 2 or 3, characterized in that: The input gear unit (201) comprises: an input rod (2011) and a gear A (2012); The input rod (2011) has a square head structure at one end and a columnar structure at the other end; the square head structure of the input rod (2011) is located outside the housing as a power source connection interface; the lower part of the columnar section is supported on the housing via an input deep groove ball bearing (2014); the gear A (2012) is coaxially sleeved on the columnar section of the input rod (2011) and is key-connected to the input rod (2011) via an input gear flat key (2013).

5. The steel bar sleeve thread wrench straight thread tightening machine as claimed in claim 4, characterized in that: The power source connected to the power source connection interface includes but is not limited to: a motor, an electric drill, an air drill, a hydraulic motor, and a crank.

6. The steel bar sleeve thread wrench straight thread tightening machine as claimed in claim 4, characterized in that: The idler gear train (202) comprises: a gear B (2021), a gear C (2022), an idler gear shaft (2023) and an idler gear (2026); The idler gear shaft (2023) has a shoulder in the middle, dividing it into two upper and lower shaft sections; its lower end is supported on the housing via an idler gear deep groove ball bearing B (2028), and an idler gear (2026) is coaxially mounted on its lower shaft section via an idler gear flat key B (2025); the idler gear (2026) meshes with a gear A (2012) in the input gear unit (201); The gear B (2021) and the gear C (2022) are coaxially arranged and connected to the upper shaft section of the idler shaft (2023) via an idler flat key A (2024); The top of the idler gear shaft (2023) is supported on the housing via an idler gear deep groove ball bearing A (2027); The gear C (2022) meshes with the gear E (2032), and the gear B (2021) meshes with the gear D (2031).

7. The steel bar sleeve thread wrench straight thread tightening machine according to claim 6, characterized in that: A clutch mechanism is provided for disconnecting and connecting the power transmission route between the gear D (2031) and the gear E (2032) in the double-open gear set (203); When the clutch mechanism is engaged, the gear D (2031) and the gear E (2032) can rotate synchronously under the drive of the idler gear system (202); when it is necessary to adjust the position of the opening on the gear E (2032) relative to the opening on the gear D (2031), the clutch mechanism is disengaged, the gear E (2032) is rotated to adjust the opening position, and the gear D (2031) remains stationary.

8. The steel bar sleeve thread wrench straight thread tightening machine as claimed in claim 1, 2 or 3, characterized in that: The housing comprises a lower housing (1) and an upper housing (3) which are butt-jointed with each other; A cavity for mounting the core gear assembly (2) is formed between the lower housing (1) and the upper housing (3); A handle (32) is installed on the surface of the upper box body (3).

9. The steel bar sleeve thread wrench straight thread tightening machine as claimed in claim 3, characterized in that: It also includes a pin shaft plugging and extraction tool, wherein a plugging and extraction hole (2035) is provided at a position on the housing corresponding to each pin shaft (2034); The pin shaft plugging and pulling tool can insert and pull out the pin shaft (2034) through the plugging and pulling hole (2035), thereby connecting and disconnecting the gear D (2031) and the gear E (2032).

10. A method for tightening a straight thread of a steel bar sleeve with a screw wrench, characterized in that: The steel bar sleeve thread wrench straight thread tightening machine according to any one of claims 1 to 9 is adopted, Before operation: the openings of the gear D (2031) and the gear E (2032) in the double-opening gear set (203) are made to correspond to the opening positions on the housing, and the whole is in an open state; When in use, the steel bar sleeve to be threaded is pushed into the double-opening gear set (203) from the opening on the housing; then the opening of the gear E (2032) is adjusted to a position symmetrical with the opening of the gear D (2031) to form a symmetrical double-opening gear set, at which time the gear D (2031) and the gear E (2032) can rotate synchronously under the drive of the idler gear system (202); Starting a power source connected to the input gear unit (201), the input gear unit (201) transmits power to the double-opening gear set (203) through the idler gear train (202), driving the double-opening gear set (203) to rotate, and then driving the steel sleeve to rotate through the rubber sleeve (2033), and the steel sleeve is tightened; After the tightening operation is completed, the opening of the gear D (2031) is kept consistent with the opening position on the housing; Adjust the opening of the gear E (2032) to the same position as the opening of the housing, and remove the steel sleeve.

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