Hand winch

Abstract

The hand winch comprises a support, a winch, a transmission rod and a handle, the winch and the transmission rod are rotationally arranged on the support, the transmission rod and the winch are matched together, the handle is arranged on the transmission rod, the hand winch further comprises a ratchet wheel, a pawl and a torsional spring, the ratchet wheel is arranged on the transmission rod, and the pawl is arranged on the transmission rod. A mounting column and an auxiliary column are arranged on the support, the torsional spring is arranged on the mounting column in a sleeving mode, the pawl is rotationally mounted on the mounting column, one end of the torsional spring is embedded into a through hole of the pawl, the other end of the torsional spring abuts against the auxiliary column, and the torsional spring is used for driving the pawl to abut against the ratchet wheel; when the winch winds the cable, the pawl is tightly attached to the ratchet wheel, and the ratchet wheel can rotate normally. The hand winch has the following beneficial effects that the ratchet wheel and the pawl are additionally arranged, and when the winch tends to rotate reversely in the cable winding process, the pawl directly abuts against the ratchet wheel to block the winch, so that the winch cannot rotate reversely.

Description

Technical Field

[0001] The utility model relates to the field of winch equipment, in particular to a hand winch. Background Art

[0002] The hand winch is a commonly used production auxiliary equipment. The structure of the winch currently used is shown in the patent publication document CN203319618U. There is a problem with the hand winch of this structure when it is used. That is, the hand winch of this structure locks the gear mechanism to prevent reverse rotation after the winch stops being hand-cranked by setting a locking block (the serial number marked in the figure in the document is 3). Therefore, the winch of this structure can only be locked when the hand cranking stops. The locking block cannot be locked for the reverse rotation that may occur due to insufficient arm strength of the hand cranker during the hand cranking process. Therefore, there is a great safety hazard when using the winch of this structure. Utility Model Content

[0003] The utility model aims at solving the above problems and provides a hand winch, which can be automatically stuck when the hand winch operator has insufficient arm strength and the winch reverses.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A hand winch comprises a bracket, a capstan, a transmission rod and a handle, wherein the capstan and the transmission rod are both rotatably arranged on the bracket, the transmission rod cooperates with the capstan, the handle is arranged on the transmission rod, and further comprises a ratchet, a pawl and a torsion spring, the ratchet is arranged on the transmission rod, a mounting column and an auxiliary column are arranged on the bracket, the torsion spring is sleeved on the mounting column, the pawl is rotatably installed on the mounting column, one end of the torsion spring is embedded in a through hole of the pawl, and the other end of the torsion spring is against the auxiliary column, and the torsion spring is used to drive the pawl to resist the ratchet; when the winch reels in the cable, the pawl is pressed against the ratchet, and the ratchet can rotate normally.

[0006] In this type of hand winch, the rotation of the handle can drive the transmission rod to rotate, and the rotation of the transmission rod can drive the winch to rotate. In this type of hand winch, the ratchet and the pawl form a barbed clamp structure, which can ensure that when the winch reels the cable, the pawl is close to the ratchet and the ratchet can rotate normally. However, when the winch reverses (which will drive the transmission rod to reverse), the pawl will jam the ratchet, thereby jamming the transmission rod and the winch to avoid the danger of reverse winch. This structure is similar to the anti-fall structure of an elevator. When the elevator falls during the upward process, it will be jammed in time to prevent the elevator from falling.

[0007] In summary, in this winch, by adding a ratchet and a pawl, when the winch tends to reverse during the process of winding the cable, the pawl directly presses against the ratchet and jams the winch, making it impossible for the winch to reverse.

[0008] Optionally, there are two pawls, and the two pawls are rotatably mounted on two different mounting poles respectively.

[0009] The two pawls serve as a backup. When one of the pawls cannot lock the ratchet, the other pawl can lock the ratchet, thereby increasing the safety factor.

[0010] Optionally, a tension spring is further included, one end of the tension spring is hooked on the pawl, and the other end of the tension spring is hooked on the auxiliary column, and the tension spring is used to drive the pawl to resist the ratchet wheel.

[0011] The purpose of setting the tension spring is to increase the safety factor, so that when the torsion spring fails or is damaged and cannot drive the pawl to resist the ratchet, the tension spring can still drive the pawl to resist the ratchet, thereby increasing the safety factor during use.

[0012] Therefore, in this winch, two pawls are provided to resist the ratchet, and each pawl is provided with a double insurance of a torsion spring and a tension spring. Therefore, when the turntable tends to reverse, this pawl can form a greater resistance force on the ratchet, which makes this winch can be used to lift heavier objects. This winch is a heavy-duty hand winch.

[0013] Optionally, a cover is further included, wherein the cover is arranged on the bracket, and the ratchet, pawl, torsion spring, mounting column and auxiliary column are all located inside the cover.

[0014] The cover protects the ratchet, pawl, torsion spring, mounting column and auxiliary column to prevent foreign objects from damaging the ratchet and other parts.

[0015] Optionally, it also includes a butt nut block tube, a reversing baffle and a brake pad, wherein the brake pad is slidably mounted on the transmission rod, the ratchet is rotatably mounted on the transmission rod, the two sides of the ratchet are respectively provided with brake pads, the butt nut block tube is arranged at one end of the transmission rod by a threaded connection, the reversing baffle is arranged on the transmission rod, and the brake pad and the reversing baffle are respectively located on the two sides of the butt nut block tube.

[0016] The butt nut block is installed on the transmission rod by means of a threaded connection. When the butt nut block is twisted in the direction of winding the cable, the butt nut block moves toward the side of the brake pad, and the butt nut block and the brake pad clamp the ratchet together. The ratchet is equivalent to being fixed on the transmission rod. At this time, the ratchet can prevent the winch from back transmission. When the butt nut block is twisted toward releasing the cable, the butt nut block moves in the direction away from the brake pad, and the brake pads on both sides of the ratchet no longer clamp the ratchet. The transmission rod can rotate freely relative to the ratchet, and the ratchet does not play any role. The transmission rod can rotate freely in the opposite direction to release the cable.

[0017] Optionally, an elastic steel ball is arranged on the reversing baffle, and a resistance portion is arranged on one side of the reversing baffle.

[0018] In this hand winch, it is assumed that the rotation direction of the docking nut block barrel is forward when the winch reels in the cable, and the rotation direction of the docking nut block barrel is reverse when the winch releases the cable. During the conversion process between forward rotation and reverse rotation, the resistance part on the reversing baffle contacts the elastic steel ball, which acts as a buffer during reversing, thereby preventing the brake from being stopped due to the reaction force caused by the rapid rotation of the rope-releasing winch.

[0019] Optionally, a notch groove is provided on the butt nut block tube, the handle is clamped in the notch groove, and the butt nut block tube and the handle are fixed together by a clevis bolt.

[0020] Optionally, a gear is provided on the transmission rod, and a spherical tooth surface is provided on the capstan, and the spherical tooth surface is meshed with the gear.

[0021] The function of the gear and the tooth surface is to realize the transmission between the capstan and the transmission rod.

[0022] Optionally, a cover plate is provided on the bracket, and the cover plate is in an arc shape.

[0023] The function of the cover plate is to protect the round tooth surface.

[0024] Optionally, a round shaft portion is provided on the capstan, the round shaft portion is rotatably matched with the bracket, the round shaft portion and the bracket are provided with bearings, the round shaft portion is parallel to the transmission rod, and a bearing is provided between the transmission rod and the bracket.

[0025] The function of the bearing is to make the winch and the transmission rod rotate more smoothly.

[0026] Optionally, the mounting column and the auxiliary column are in a parallel and non-contacting state.

[0027] The beneficial effect of the utility model is that by adding a ratchet wheel and a pawl, when the winch has a tendency to reverse during the cable winding process, the pawl directly presses against the ratchet wheel to jam the winch, so that the winch cannot reverse. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram showing the use of a hand winch;

[0029] Figure 2 It is a schematic diagram of the matching relationship between the capstan and the transmission rod;

[0030] Figure 3 It is a schematic diagram of the positional relationship between the ratchet and the two pawls;

[0031] Figure 4This is a schematic diagram showing the position of the docking nut block on the transmission rod;

[0032] Figure 5 It is a schematic diagram showing the positional relationship between the butt nut block and the ratchet;

[0033] The reference numerals in the figure are: 1, bracket; 2, cover; 3, docking nut block cylinder; 301, notch groove; 4, bolt; 5, handle; 6, capstan; 601, tooth surface; 602, round shaft; 7, bearing; 8, transmission rod; 9, gear; 10, auxiliary column; 11, torsion spring; 12, tension spring; 13, mounting column; 14, pawl; 15, ratchet; 16, reversing block; 1601, interference part; 17, elastic steel ball; 18, brake pad. DETAILED DESCRIPTION

[0034] The utility model is described in detail below in conjunction with the accompanying drawings.

[0035] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, a hand winch includes a bracket 1, a capstan 6, a transmission rod 8 and a handle 5. The capstan 6 and the transmission rod 8 are both rotatably arranged on the bracket 1. The transmission rod 8 cooperates with the capstan 6. The handle 5 is arranged on the transmission rod 8. It also includes a ratchet 15, a pawl 14 and a torsion spring 11. The ratchet 15 is arranged on the transmission rod 8. The bracket 1 is provided with a mounting column 13 and an auxiliary column 10. The torsion spring 11 is sleeved on the mounting column 13. The pawl 14 is rotatably installed on the mounting column 13. One end of the torsion spring 11 is embedded in the through hole of the pawl 14, and the other end of the torsion spring 11 is against the auxiliary column 10. The torsion spring 11 is used to drive the pawl 14 to resist the ratchet 15; when the capstan 6 reels the cable, the pawl 14 is close to the ratchet 15, and the ratchet 15 can rotate normally.

[0036] In this hand winch, the rotation of the handle 5 can drive the transmission rod 8 to rotate, and the rotation of the transmission rod 8 can drive the capstan 6 to rotate. In this hand winch, the ratchet 15 and the pawl 14 form a barbed clamping structure, which can ensure that when the capstan 6 reels the cable, the pawl 14 is close to the ratchet 15, and the ratchet 15 can rotate normally, but when the capstan 6 reverses (which will drive the transmission rod 8 to reverse), the pawl 14 clamps the ratchet 15, thereby blocking the transmission rod 8 and the capstan 6, avoiding the danger of reverse rotation of the capstan 6. This structure is similar to the anti-falling structure of the elevator. When the elevator falls during the upward process, it is jammed in time to prevent the elevator from falling.

[0037] In summary, in this winch, by adding the ratchet 15 and the pawl 14, when the winch 6 shows a tendency to reverse during the cable winding process, the pawl 14 directly presses against the ratchet 15 to jam the winch 6, so that the winch 6 cannot reverse.

[0038] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, there are two pawls 14 , and the two pawls 14 are rotatably mounted on two different mounting posts 13 .

[0039] The two ratchet pawls 14 serve as backup. When one of the ratchet pawls 14 cannot lock the ratchet 15 , the other ratchet pawl 14 can lock the ratchet 15 , thereby increasing the safety factor.

[0040] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, it also includes a tension spring 12 , one end of the tension spring 12 is hooked on the pawl 14 , and the other end of the tension spring 12 is hooked on the auxiliary column 10 . The tension spring 12 is used to drive the pawl 14 to press against the ratchet wheel 15 .

[0041] The purpose of setting the tension spring 12 is to improve the safety factor. In this way, when the torsion spring 11 fails or is damaged and cannot drive the pawl 14 to resist the ratchet 15, the tension spring 12 can still drive the pawl 14 to resist the ratchet 15, thereby improving the safety factor during use.

[0042] Therefore, in this winch, two pawls 14 are provided to resist the ratchet 15, and each pawl 14 is provided with a double insurance of a torsion spring 11 and a tension spring 12. Therefore, when the turntable tends to reverse, this pawl 14 can form a greater resistance force on the ratchet 15, which makes this winch can be used to lift heavier objects. This winch is a heavy-duty hand winch.

[0043] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, it also includes a cover 2 , which is arranged on the bracket 1 , and the ratchet 15 , the pawl 14 , the torsion spring 11 , the mounting column 13 and the auxiliary column 10 are all located in the cover 2 .

[0044] The cover 2 protects the ratchet 15, the pawl 14, the torsion spring 11, the mounting column 13 and the auxiliary column 10 to prevent foreign objects from damaging the ratchet 15 and other parts.

[0045] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4As shown, it also includes a butt nut block cylinder 3, a reversing block plate 16 and a brake pad 18. The brake pad 18 is slidably sleeved on the transmission rod 8, and the ratchet 15 is rotatably sleeved on the transmission rod 8. The two sides of the ratchet 15 are brake pads 18 respectively. The butt nut block cylinder 3 is set on one end of the transmission rod 8 by threaded connection. The reversing block plate 16 is set on the transmission rod 8 by spline connection, and the brake pad 18 and the reversing block plate 16 are respectively located on both sides of the butt nut block cylinder 3. A retaining spring is set at one end of the transmission rod 8, and the retaining spring is used to prevent the reversing block plate 16 from falling off the transmission rod 8.

[0046] Combined with Figure 5 As shown, the butt nut block tube 3 is installed on the transmission rod 8 by threaded connection. When the butt nut block tube 3 is twisted in the direction of winding the cable (i.e., twisting in the forward direction), the butt nut block tube 3 moves to the side of the brake pad 18 (i.e., the butt nut block tube 3 moves downward), and the butt nut block tube 3 and the brake pad 18 clamp the ratchet 15 together. The ratchet 15 is equivalent to being fixed on the transmission rod 8. At this time, the ratchet 15 can prevent the capstan 6 from being reversed. When the butt nut block tube 3 is twisted toward releasing the cable, the butt nut block tube 3 moves in the direction away from the brake pad 18 (i.e., the butt nut block tube 3 moves upward), and the brake pads 18 on both sides of the ratchet 15 no longer clamp the ratchet 15, and the transmission rod 8 can rotate freely relative to the ratchet 15. The ratchet 15 does not have any effect, and the transmission rod 8 can rotate freely in the reverse direction to release the cable. When the ratchet 15 does not have any effect, the handle 5 is rotated in the reverse direction to quickly release the cable on the capstan 6.

[0047] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, an elastic steel ball 17 is disposed on the reversing baffle 16 , and a resisting portion 1601 is disposed on one side of the reversing baffle 16 .

[0048] In this hand-cranked winch, assuming that the rotation direction of the docking nut block cylinder 3 is forward when the winch 6 reels in the cable, and the rotation direction of the docking nut block cylinder 3 is reverse when the winch 6 releases the cable, during the conversion process between forward rotation and reverse rotation, the resistance part 1601 on the reversing baffle 16 contacts with the elastic steel ball 17, which acts as a buffer during reversing, thereby preventing the fast-release rope winch 6 from being braked due to the reaction force.

[0049] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, a notch groove 301 is provided on the butt nut block tube 3, and the handle 5 is clamped in the notch groove 301, and the butt nut block tube 3 and the handle 5 are fixed together by a clevis bolt 4.

[0050] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, a gear 9 is provided on the transmission rod 8 , and a spherical tooth surface 601 is provided on the capstan 6 , and the spherical tooth surface 601 is meshed with the gear 9 .

[0051] The function of the gear 9 and the tooth surface 601 is to realize the transmission between the capstan 6 and the transmission rod 8 .

[0052] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, a cover plate is provided on the bracket 1, and the cover plate is in an arc shape.

[0053] The function of the cover plate is to protect the round tooth surface 601.

[0054] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, a round shaft portion 602 is provided on the capstan 6, and the round shaft portion 602 is rotatably matched with the bracket 1. The round shaft portion 602 and the bracket 1 are provided with bearings 7. The round shaft portion 602 is parallel to the transmission rod 8, and a bearing 7 is provided between the transmission rod 8 and the bracket 1.

[0055] The function of the bearing 7 is to make the capstan 6 and the transmission rod 8 rotate more smoothly.

[0056] As attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 And attached Figure 4 As shown, the mounting column 13 and the auxiliary column 10 are in a parallel and non-contact state.

[0057] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, directly or indirectly used in other related technical fields, are also included in the protection scope of the present invention.

Claims

1. A hand winch, comprising a bracket, a capstan, a transmission rod and a handle, wherein the capstan and the transmission rod are both rotatably arranged on the bracket, the transmission rod cooperates with the capstan, and the handle is arranged on the transmission rod, characterized in that: It also includes a ratchet, a pawl and a torsion spring, wherein the ratchet is arranged on the transmission rod, the bracket is provided with a mounting column and an auxiliary column, the torsion spring is sleeved on the mounting column, the pawl is rotatably mounted on the mounting column, one end of the torsion spring is embedded in the through hole of the pawl, and the other end of the torsion spring is against the auxiliary column, and the torsion spring is used to drive the pawl to resist the ratchet; when the winch reels the cable, the pawl is pressed against the ratchet, and the ratchet can rotate normally.

2. The hand winch according to claim 1, characterized in that: There are two ratchets, and the two ratchets are rotatably mounted on two different mounting posts respectively.

3. The hand winch according to claim 1, characterized in that: It also includes a tension spring, one end of which is hooked on the pawl, and the other end of which is hooked on the auxiliary column. The tension spring is used to drive the pawl to resist the ratchet wheel.

4. The hand winch according to claim 1, characterized in that: It also includes a cover, which is arranged on the bracket, and the ratchet, the pawl, the torsion spring, the mounting column and the auxiliary column are all located in the cover.

5. The hand winch according to claim 1, characterized in that: It also includes a butt nut block tube, a reversing block plate and a brake pad, wherein the brake pad is slidably sleeved on the transmission rod, the ratchet is rotatably sleeved on the transmission rod, the two sides of the ratchet are brake pads respectively, the butt nut block tube is arranged at one end of the transmission rod by a threaded connection, the reversing block plate is arranged on the transmission rod, and the brake pad and the reversing block plate are respectively located on both sides of the butt nut block tube.

6. The hand winch according to claim 5, characterized in that: An elastic steel ball is arranged on the reversing baffle, and a resisting portion is arranged on one side of the reversing baffle.

7. The hand winch according to claim 5, characterized in that: A notch groove is arranged on the butt nut block tube, the handle is clamped in the notch groove, and the butt nut block tube and the handle are fixed together by bolts.

8. The hand winch according to claim 1, characterized in that: The transmission rod is provided with a gear, and the capstan is provided with a scalloped surface, which is meshed with the gear.

9. The hand winch according to claim 1, characterized in that: The bracket is provided with a cover plate, and the cover plate is in an arc shape.

10. The hand winch according to claim 1, characterized in that: The capstan is provided with a round shaft portion, the round shaft portion is rotatably matched with the bracket, the round shaft portion and the bracket are provided with bearings, the round shaft portion is parallel to the transmission rod, and a bearing is provided between the transmission rod and the bracket.

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