CN210389007U

CN210389007U - Portable wrench for air conditioner installation

Info

Publication number: CN210389007U
Application number: CN201921189229.9U
Authority: CN
Inventors: 陆超
Original assignee: Anhui Rongda Mechanical And Electrical Engineering Co Ltd
Current assignee: Anhui Rongda Mechanical And Electrical Engineering Co Ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-04-24
Anticipated expiration: 2029-07-25

Abstract

The utility model discloses a portable wrench for air conditioner installation, which relates to the technical field of wrenches, and the key point of the technical proposal is that the portable wrench comprises a wrench head, a wrench handle and a fastening device; a connecting column is fixed on one side of the wrench head close to the wrench handle, a circular groove is formed on one side of the connecting column close to the wrench handle, and the connecting column is in threaded connection with the wrench handle; the fastening device comprises a square block, two mounting through holes, two connecting shafts, a limiting piece and a positioning groove, wherein the two connecting shafts are respectively arranged in the two mounting through holes in a sliding manner; dragging mechanisms for dragging the limiting sheets to be close to the square blocks are respectively arranged between the two connecting shafts and the square blocks; a pushing mechanism used for pushing the limiting sheet to be far away from the square block is arranged between the square block and the limiting sheet. The utility model provides a wrench end take place the problem that breaks away from with wrench handle in the use, reached the effect that prevents wrench end and wrench handle in use and break away from.

Description

Portable wrench for air conditioner installation

Technical Field

The utility model relates to a spanner technical field, more specifically the utility model discloses, it relates to a portable spanner for air conditioner installation.

Background

Currently, wrenches are hand tools that use the principle of leverage to turn bolts, screws, nuts and other threaded fasteners, requiring manipulation by the wrench during installation and maintenance.

The prior art can refer to the Chinese utility model patent with the publication number of CN206123523U, which discloses a portable wrench for air conditioner installation, comprising a wrench head, wherein a slot is recessed on the end surface of the tail handle of the wrench head, and a wrench handle is connected in the slot; the end surface of the wrench handle is fixed with a convex block which is used for being inserted into the slot.

However, the wrench needs to apply force to the wrench handle to rotate the wrench head to the threaded fastener in the use process, the wrench head and the wrench handle are connected only by inserting the projection and the slot, a fastening device for fixing the wrench head at one end of the wrench handle is absent, the wrench may have the condition that the wrench head is loose in the use process, and the wrench head may be separated from the wrench handle by continuously using the wrench under the condition that the wrench head is loose.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a not enough to prior art exists, the utility model aims to provide a portable spanner for air conditioner installation, it can reduce spanner head and spanner handle and take place the possibility of separation through setting up fastener between spanner head and spanner handle.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a portable spanner for air conditioner installation, includes spanner head and with spanner head threaded connection's spanner handle, the spanner head is close to spanner handle one side and is fixed with spliced pole, its characterized in that: the wrench also comprises a fastening device which is arranged between the wrench head and the wrench handle and is used for preventing the wrench handle from rotating; one side of the connecting column close to the wrench handle is provided with a circular groove;

the fastening device comprises a square block fixed on the inner peripheral surface of the circular groove, two mounting through holes formed in the bottom of the square block, two connecting shafts respectively arranged in the two mounting through holes in a sliding manner along the axial direction of the circular groove, a limiting piece fixed at one end of each connecting shaft close to the wrench handle, and a positioning groove formed in one side of the wrench handle close to the wrench head and used for being inserted with the limiting piece;

dragging mechanisms for dragging the limiting pieces to be close to the square blocks are respectively arranged between the two connecting shafts and the square blocks;

and a pushing mechanism used for pushing the limiting piece to be far away from the square block is arranged between the square block and the limiting piece.

Through adopting above-mentioned technical scheme, wrench handle and spliced pole threaded connection back, remove spacing piece to wrench handle one side through pushing mechanism, peg graft until spacing piece and constant head tank, stop the wrench head to rotate through spacing piece, because wrench head and wrench handle itself pass through threaded connection, can reduce the possibility that the wrench head takes place to become flexible.

The utility model discloses further set up to: a circular through hole is formed in one side, away from the wrench handle, of the circular groove, and a support shaft is arranged in the circular through hole in a sliding mode along the axial direction of the circular groove; the pushing mechanism comprises a strip-shaped groove formed in one side, close to the supporting shaft, of the square block, a pressing block arranged in the strip-shaped groove in a sliding mode along the radial direction of the circular groove, and a pressing piece fixed to one side, close to the square block, of the limiting piece; a first matching assembly used for pushing the pressing piece to move towards one side far away from the square block is arranged between the pressing piece and the pressing piece; a pressing mechanism for pressing the pressing block is arranged between the supporting shaft and the pressing block; and a thread mechanism for driving the supporting shaft to move is arranged between the supporting shaft and the connecting column.

Through adopting above-mentioned technical scheme, through the screw mechanism downward movement back shaft, the back shaft presses the briquetting through pressing mechanism, and the briquetting promotes the pressing piece through first cooperation subassembly and removes to keeping away from square box one side, pegs graft until spacing piece and constant head tank, prevents the spanner head to rotate, reduces the not hard up possibility of spanner head.

The utility model discloses further set up to: the first matching assembly comprises two first inclined planes which are arranged on the opposite inner sides of the pressing piece and the pressing block.

Through adopting above-mentioned technical scheme, briquetting and pressing piece butt, when the briquetting removed to keeping away from square box one side, the pressing piece removed to being close to handle one side thereupon, promoted spacing piece through the pressing piece and removed and peg graft with the constant head tank, realized will pulling the handle and be fixed in spliced pole one end.

The utility model discloses further set up to: the pressing mechanism comprises a pressing plate fixed on the peripheral surface of the supporting shaft and a second matching component arranged between the pressing plate and the pressing block and used for pushing the pressing block to move; one side of the strip-shaped groove, which is far away from the supporting shaft, is fixed with a first spring, and one end of the first spring, which is close to the supporting shaft, is fixedly connected with one side of the pressing block, which is far away from the supporting shaft.

By adopting the technical scheme, when the support shaft moves towards one side of the wrench handle, the pressing plate moves to be in contact with the pressing block and starts to press the pressing block towards one side close to the square box, and the pressing block moves towards one side close to the square box and drives the pressing piece to move towards one side close to the wrench handle; when the support shaft moves towards one side close to the wrench head, the pressing plate is gradually separated from the pressing block, the pressing block moves towards one side close to the support shaft, and the limiting piece is far away from the wrench handle through the dragging mechanism, so that the wrench handle can be separated from the connecting column; realize that spacing piece is close to or keeps away from the constant head tank through the briquetting in the bar inslot removes to further prevent the spanner head to rotate through pegging graft of spacing piece and constant head tank, be convenient for be fixed in the spliced pole tip with the spanner handle or with spanner handle and spliced pole separation.

The utility model discloses further set up to: the second matching assembly comprises two second inclined planes which are respectively arranged on the opposite inner sides of the pressing plate and the pressing block.

Through adopting above-mentioned technical scheme, through setting up the second inclined plane, when briquetting and clamp plate contact, the briquetting can remove to the one side of keeping away from the clamp plate to insert the constant head tank with spacing piece through clamp plate and pressing piece in, realize the grafting of spacing piece and constant head tank fixed.

The utility model discloses further set up to: the thread mechanism comprises a square through hole formed in the peripheral surface of the connecting column, a rotating column rotatably mounted in the square through hole and a thread shaft fixed on one side of the supporting shaft close to the wrench head, and the thread shaft is in threaded connection with the rotating column; and a guide assembly for preventing the threaded shaft from rotating is arranged between the threaded shaft and the circular groove.

Through adopting above-mentioned technical scheme, rotate the post and rotate the back, the threaded shaft is along the axial displacement of circular recess under the effect of direction subassembly to drive the rising or the decline of clamp plate through the supporting shaft, thereby realize that spacing piece is close to or keeps away from the constant head tank, be convenient for fix the wrench head through spacing piece.

The utility model discloses further set up to: the guide assembly comprises a fixed cylinder fixed on the inner peripheral surface of the circular groove, a guide through hole formed in the bottom surface of the fixed cylinder and a square sheet fixed on the outer peripheral surface of the support shaft, and the square sheet is arranged in the guide through hole in a sliding mode along the axial direction of the circular groove.

Through adopting above-mentioned technical scheme, square piece slides with the direction through-hole and is connected, can prevent the rotation of screw shaft, makes the screw shaft along circular recess axial displacement, is convenient for through the removal of screw shaft control back shaft to the realization is to the control of wrench handle.

The utility model discloses further set up to: and a blocking piece for blocking the square piece from moving is fixed at the bottom of the fixed cylinder.

Through adopting above-mentioned technical scheme, the clamp plate downstream to break away from the back with the briquetting, the briquetting is to the roll-off of bar groove outside to drive spacing piece and break away from the constant head tank, through setting up the separation blade, make the restriction to the displacement distance of square piece, further restrict the decurrent displacement distance of clamp plate, make the clamp plate move to with the briquetting contact and with the briquetting impress the strip groove after the stop movement, promote spacing piece to the fixed effect of spanner handle.

The utility model discloses further set up to: each group of dragging mechanisms comprises a limiting wafer fixed at one end, far away from the limiting sheet, of the connecting shaft and a second spring fixed at one side, close to the square block, of the limiting wafer, and the end, far away from the limiting wafer, of the second spring is fixedly connected with one side, close to the limiting wafer, of the square block.

Through adopting above-mentioned technical scheme, when clamp plate and briquetting contactless, the second spring is in the state that compresses tightly, and when the clamp plate pressed the briquetting to the bar inslot, the second spring was lax gradually to drive spacing piece through the connecting axle and remove to being close to square box one side, spacing piece and constant head tank separation, make the trigger handle can be at circular inslot internal rotation, and then separation trigger handle and spliced pole, be convenient for trigger handle and the separation of trigger head, conveniently carry.

To sum up, the utility model discloses compare and have following beneficial effect in prior art:

1. after the wrench handle is in threaded connection with the connecting column, the limiting piece is moved to one side of the wrench handle through the pushing mechanism until the limiting piece is inserted into the positioning groove, so that the condition that the threads are loosened due to the fact that force is applied to the wrench handle is reduced;

2. through the downward removal back shaft of screw mechanism, the back shaft passes through pressing mechanism and presses the briquetting, and the briquetting promotes the pressing part through first cooperation subassembly and removes to keeping away from square piece one side, pegs graft until spacing piece and constant head tank, is convenient for control the decline of spacing piece through screw mechanism.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the threaded mechanism of the present invention;

FIG. 3 is a cross-sectional view of the circular groove of the present invention;

FIG. 4 is a schematic view of the supporting shaft of the present invention;

FIG. 5 is a cross-sectional view of the center display fastening device of the present invention;

fig. 6 is an enlarged schematic view of a portion a of fig. 4.

In the figure: 1. a wrench head; 11. connecting columns; 12. a circular groove; 121. a circular through hole; 2. a wrench handle; 3. a fastening device; 31. a square block; 311. mounting a through hole; 32. a connecting shaft; 321. a limiting sheet; 33. positioning a groove; 4. a pushing mechanism; 41. a strip-shaped groove; 411. a first spring; 42. briquetting; 43. a pressing member; 44. a first mating component; 441. a first inclined plane; 5. a dragging mechanism; 51. limiting the wafer; 52. a second spring; 6. a support shaft; 7. a pressing mechanism; 71. pressing a plate; 72. a second mating component; 721. a second inclined plane; 8. a screw mechanism; 81. a square through hole; 82. rotating the column; 83. a threaded shaft; 84. a guide assembly; 841. fixing the cylinder; 842. a guide through hole; 843. a square piece; 844. a baffle plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Example (b): a portable wrench for air conditioner installation, as shown in fig. 1 and 2, comprises a wrench head 1, a wrench handle 2 in threaded connection with the wrench head 1, and a fastening device 3 arranged between the wrench head 1 and the wrench handle 2 for preventing the wrench handle 2 from rotating; a connecting column 11 is fixed on one side of the wrench head 1 close to the wrench handle 2, and a circular groove 12 is formed on one side of the connecting column 11 close to the wrench handle 2; referring to fig. 6, the fastening device 3 includes a square block 31 fixed on the inner circumferential surface of the circular groove 12, two installation through holes 311 formed in the bottom of the square block 31, two connecting shafts 32 respectively slidably disposed in the two installation through holes 311 along the axial direction of the circular groove 12, a positioning slot 33 formed in one side of the wrench handle 2 close to the wrench head 1 and used for inserting the positioning piece 321, and a limiting piece 321 fixed on one end of the two connecting shafts 32 close to the wrench handle 2. After the limiting piece 321 is inserted into the positioning slot 33, the wrench handle 2 is prevented from rotating in the circular slot 12.

As shown in fig. 6, a dragging mechanism 5 for dragging the limiting sheet 321 to approach the square block 31 is respectively arranged between the two connecting shafts 32 and the square block 31; a pushing mechanism 4 for pushing the limiting sheet 321 to be away from the square block 31 is arranged between the square block 31 and the limiting sheet 321. After the wrench handle 2 is in threaded connection with the connecting column 11, the limiting piece 321 is moved to one side of the wrench handle 2 through the pushing mechanism 4 until the limiting piece 321 is inserted into the positioning groove 33, and the wrench head 1 is prevented from rotating through the limiting piece 321.

As shown in fig. 2 and 3, a circular through hole 121 is formed in one side of the circular groove 12, which is away from the wrench handle 2, and a support shaft 6 is slidably arranged in the circular through hole 121 along the axial direction of the circular groove 12; as shown in fig. 5, the pushing mechanism 4 includes a strip-shaped groove 41 formed on one side of the square block 31 close to the supporting shaft 6, a pressing block 42 slidably disposed in the strip-shaped groove 41 along the radial direction of the circular groove 12, and a pressing piece 43 fixed to one side of the limiting piece 321 close to the square block 31; a first matching assembly 44 for pushing the pressing piece 43 to move towards the side far away from the square block 31 is arranged between the pressing piece 42 and the pressing piece 43; a pressing mechanism 7 for pressing the pressing block 42 is arranged between the supporting shaft 6 and the pressing block 42; a screw mechanism 8 for driving the support shaft 6 to move is arranged between the support shaft 6 and the connecting column 11. Move down support shaft 6 through screw mechanism 8, support shaft 6 presses briquetting 42 through pressing mechanism 7, and briquetting 42 promotes pressing member 43 through first cooperation subassembly 44 and removes to keeping away from square box one side, pegs graft with constant head tank 33 until spacing piece 321, prevents the rotation of wrench head 1.

As shown in fig. 5, the first engaging assembly 44 includes two first inclined surfaces 441 disposed on opposite inner sides of the pressing member 43 and the pressing block 42. The pressing piece 42 is abutted against the pressing piece 43, and when the pressing piece 42 moves to one side far away from the square box, the pressing piece 43 moves to one side close to the wrench handle 2 along with the pressing piece.

As shown in fig. 5 and 6, the pressing mechanism 7 includes a pressing plate 71 fixed on the outer peripheral surface of the supporting shaft 6 and a second fitting assembly 72 disposed between the pressing plate 71 and the pressing block 42 for pushing the pressing block 42 to move; a first spring 411 is fixed on one side of the strip-shaped groove 41 far away from the support shaft 6, and one end of the first spring 411 close to the support shaft 6 is fixedly connected with one side of the pressing block 42 far away from the support shaft 6. When the supporting shaft 6 moves towards one side of the wrench handle 2, the pressing plate 71 moves to be in contact with the pressing block 42, the pressing block 42 starts to be pressed towards one side close to the square box, the pressing block 42 moves towards one side close to the square box, and the pressing piece 43 is driven to move towards one side close to the wrench handle 2; when supporting shaft 6 moves to one side close to wrench head 1, pressing plate 71 gradually separates from pressing block 42, pressing block 42 moves to one side close to supporting shaft 6, and limiting piece 321 is far away from wrench handle 2 through dragging mechanism 5, so that wrench handle 2 can be separated from connecting column 11.

As shown in fig. 6, the second engagement assembly 72 includes two second inclined surfaces 721 respectively disposed on opposite inner sides of the pressing plate 71 and the pressing block 42. Through setting up second inclined plane 721, when briquetting 42 and clamp plate 71 contact, briquetting 42 can be to keeping away from the one side of clamp plate 71 and remove to insert spacing piece 321 in constant head tank 33 through clamp plate 71 and pressing piece 43, realize spacing piece 321 and constant head tank 33's grafting fixed.

As shown in fig. 5, each set of dragging mechanism 5 includes a limiting disc 51 fixed at one end of the connecting shaft 32 far from the limiting sheet 321 and a second spring 52 fixed at one side of the limiting disc 51 close to the square block 31, and one end of the second spring 52 far from the limiting disc 51 is fixedly connected with one side of the square block 31 close to the limiting disc 51. When clamp plate 71 and briquetting 42 contactless, second spring 52 is in the state of compressing tightly, and when clamp plate 71 pressed briquetting 42 to bar groove 41 in, second spring 52 relaxed gradually to drive spacing piece 321 through connecting axle 32 and remove to being close to square box one side, spacing piece 321 and constant head tank 33 separation, make wrench handle 2 can be at circular recess 12 internal rotation, and then separation wrench handle 2 and spliced pole 11.

As shown in fig. 2 and 3, the screw mechanism 8 includes a square through hole 81 opened on the outer peripheral surface of the connecting column 11, a rotating column 82 rotatably installed in the square through hole 81, and a screw shaft 83 fixed on the side of the support shaft 6 close to the wrench head 1, the screw shaft 83 is in threaded connection with the rotating column 82; a guide assembly 84 for preventing the rotation of the threaded shaft 83 is provided between the threaded shaft 83 and the circular groove 12. After the rotating column 82 rotates, the threaded shaft 83 moves along the axial direction of the circular groove 12 under the action of the guide assembly 84, and drives the pressure plate 71 to ascend or descend through the supporting shaft 6, so that the limiting piece 321 approaches or leaves the positioning groove 33.

As shown in fig. 3 and 4, the guide assembly 84 includes a fixing cylinder 841 fixed to the inner peripheral surface of the circular groove 12, a guide through hole 842 opened in the bottom surface of the fixing cylinder 841, and a square piece 843 fixed to the outer peripheral surface of the support shaft 6, the square piece 843 being slidably disposed in the guide through hole 842 in the axial direction of the circular groove 12. The square piece 843 is slidably coupled to the guide through hole 842 to prevent the rotation of the screw shaft 83, so that the screw shaft 83 moves axially along the circular groove 12. A blocking piece 844 used for blocking the square piece 843 from moving is fixed at the bottom of the fixed cylinder 841; the bottom surface of the stopper 844 is opened with a through hole for passing the support shaft 6. By providing the stopper 844, the moving distance of the square piece 843 is restricted, and the downward moving distance of the pressing plate 71 is further restricted, so that the pressing plate 71 is moved to be in contact with the pressing block 42 and stops moving after the pressing block 42 is pressed into the bar-shaped groove 41.

The working principle of the embodiment is as follows:

after the wrench handle 2 is in threaded connection with the connecting column 11, the rotating column 82 rotates, the threaded shaft 83 moves axially along the circular groove 12, and the supporting shaft 6 drives the pressing plate 71 to descend; after the pressing plate 71 contacts with the pressing block 42, the pressing plate 71 presses the pressing block 42 towards one side close to the square block 31, the pressing block 42 moves towards one side close to the square block 31, and drives the pressing piece 43 to move towards one side close to the wrench handle 2 until the limiting piece 321 is inserted into the positioning groove 33, so that the wrench handle 2 is prevented from rotating.

The reverse rotation column 82 rotates, when the support shaft 6 moves towards one side close to the wrench head 1, the pressing plate 71 is gradually separated from the pressing block 42, the pressing block 42 moves towards one side close to the support shaft 6, and the limiting piece 321 is far away from the wrench handle 2 through the dragging mechanism 5, so that the wrench handle 2 can be separated from the connecting column 11.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a portable spanner for air conditioner installation, includes spanner head (1) and with spanner head (1) threaded connection's spanner handle (2), spanner head (1) is close to spanner handle (2) one side and is fixed with spliced pole (11), its characterized in that: the wrench is characterized by also comprising a fastening device (3) which is arranged between the wrench head (1) and the wrench handle (2) and is used for preventing the wrench handle (2) from rotating; one side of the connecting column (11) close to the wrench handle (2) is provided with a circular groove (12);

the fastening device (3) comprises a square block (31) fixed on the inner peripheral surface of the circular groove (12), two mounting through holes (311) formed in the bottom of the square block (31), two connecting shafts (32) respectively arranged in the two mounting through holes (311) in a sliding manner along the axial direction of the circular groove (12), a limiting piece (321) fixed at one end, close to the wrench handle (2), of the two connecting shafts (32), and a positioning groove (33) formed in one side, close to the wrench head (1), of the wrench handle (2) and used for being inserted with the limiting piece (321);

dragging mechanisms (5) for dragging the limiting pieces (321) to be close to the square blocks (31) are respectively arranged between the two connecting shafts (32) and the square blocks (31);

a pushing mechanism (4) used for pushing the limiting piece (321) to be far away from the square block (31) is arranged between the square block (31) and the limiting piece (321).

2. A portable wrench for air conditioning installation as claimed in claim 1, wherein: a circular through hole (121) is formed in one side, away from the wrench handle (2), of the circular groove (12), and a support shaft (6) is arranged in the circular through hole (121) in a sliding mode along the axial direction of the circular groove (12);

the pushing mechanism (4) comprises a strip-shaped groove (41) formed in one side, close to the supporting shaft (6), of the square block (31), a pressing block (42) arranged in the strip-shaped groove (41) in a sliding mode along the radial direction of the circular groove (12), and a pressing piece (43) fixed to one side, close to the square block (31), of the limiting sheet (321);

a first matching assembly (44) used for pushing the pressing piece (43) to move towards one side far away from the square block (31) is arranged between the pressing piece (42) and the pressing piece (43); a pressing mechanism (7) for pressing the pressing block (42) is arranged between the supporting shaft (6) and the pressing block (42); and a thread mechanism (8) for driving the support shaft (6) to move is arranged between the support shaft (6) and the connecting column (11).

3. A portable wrench as claimed in claim 2, in which: the first matching assembly (44) comprises two first inclined surfaces (441) which are arranged on the opposite inner sides of the pressing piece (43) and the pressing block (42).

4. A portable wrench as claimed in claim 2, in which: the pressing mechanism (7) comprises a pressing plate (71) fixed on the outer peripheral surface of the supporting shaft (6) and a second matching component (72) arranged between the pressing plate (71) and the pressing block (42) and used for pushing the pressing block (42) to move;

one side of the strip-shaped groove (41) far away from the supporting shaft (6) is fixedly provided with a first spring (411), and one end of the first spring (411) close to the supporting shaft (6) is fixedly connected with one side of the pressing block (42) far away from the supporting shaft (6).

5. A portable wrench as claimed in claim 4, in which: the second matching component (72) comprises two second inclined surfaces (721) which are respectively arranged on the opposite inner sides of the pressure plate (71) and the pressing block (42).

6. A portable wrench as claimed in claim 2, in which: the screw mechanism (8) comprises a square through hole (81) formed in the outer peripheral surface of the connecting column (11), a rotating column (82) rotatably mounted in the square through hole (81), and a threaded shaft (83) fixed to one side, close to the wrench head (1), of the supporting shaft (6), and the threaded shaft (83) is in threaded connection with the rotating column (82);

a guide assembly (84) for preventing the rotation of the threaded shaft (83) is arranged between the threaded shaft (83) and the circular groove (12).

7. A portable wrench as claimed in claim 6, in which: the guide assembly (84) comprises a fixed cylinder (841) fixed on the inner circumferential surface of the circular groove (12), a guide through hole (842) formed in the bottom surface of the fixed cylinder (841) and a square sheet (843) fixed on the outer circumferential surface of the support shaft (6), wherein the square sheet (843) is arranged in the guide through hole (842) in a sliding mode along the axial direction of the circular groove (12).

8. A portable wrench as claimed in claim 7, in which: and a blocking plate (844) used for blocking the square plate (843) from moving is fixed at the bottom of the fixed cylinder (841).

9. A portable wrench for air conditioning installation as claimed in claim 1, wherein: each group of dragging mechanisms (5) comprises a limiting wafer (51) fixed at one end, far away from the limiting piece (321), of the connecting shaft (32) and a second spring (52) fixed at one side, close to the square block (31), of the limiting wafer (51), and one end, far away from the limiting wafer (51), of the second spring (52) is fixedly connected with one side, close to the limiting wafer (51), of the square block (31).