Over-discharge protection device and winding equipment

Abstract

The utility model relates to the technical field of winches, and discloses an over-discharge protection device and winding equipment. The over-discharge protection device comprises a fixing assembly, a rotating assembly, a first bearing, an elastic piece and an angle sensor, the rotating assembly is rotatably arranged on the fixing assembly and comprises a first positioning part and a second positioning part, and the first positioning part and the second positioning part are sequentially arranged in the direction of a rotating shaft of the rotating assembly. The plane of the rotating shaft and the first positioning part is different from the plane of the rotating shaft and the second positioning part, the first bearing is arranged between the fixing assembly and the rotating assembly, the elastic piece is used for pressing the first positioning part and the second positioning part to the winding drum, and the angle sensor is used for detecting the angle of the rotating assembly. The fixed assembly and / or the rotating assembly are / is provided with an oil injection channel used for lubricating the first bearing. According to the utility model, over-discharge protection can be realized, and the rotation of the rotating assembly can be smoother.

Description

TECHNICAL FIELD

[0001] The utility model relates to hoist technology field, concretely relates to over -discharge protection device and hoist equipment. BACKGROUND

[0002] Hoist equipment is the core component of truck crane, and its main function is to control the winding and unwinding of cable on the drum, so as to realize the lifting operation of heavy objects. When the truck crane is lifting heavy objects, the cable will generate a pulling force on the pressing plate fixed to it. In order to reduce this pulling force and ensure safety, when the cable is unwound to the extreme position, a certain number of turns of the cable need to be reserved on the drum as a safety load reduction ring in addition to the fixed rope ring.

[0003] In related technology, over-discharge protection is generally performed on the hoist equipment by using a contact switch. Specifically, the roller is installed on the rotating support and is pressed against the drum under the action of the elastic member. The roller has a large-diameter portion and a small-diameter portion. Before the cable is unwound to the extreme position, the large-diameter portion is in contact with the cable for positioning. When the cable is unwound to the extreme position, the small-diameter portion is in contact with the cable for positioning, thereby causing the angle of the rotating support to change and triggering the contact switch to send a protection signal.

[0004] However, it is noted that the rotating support sometimes exhibits poor rotation, resulting in a decrease in response sensitivity, which not only affects the use of the hoist equipment but also may increase the safety risk. INVENTION CONTENTS

[0005] Therefore, the utility model provides an over-discharge protection device and a hoist equipment to solve the problem of poor rotation of the over-discharge protection device.

[0006] In a first aspect, the utility model provides an over-discharge protection device, which comprises a fixed component, a rotating component, a first bearing, an elastic member, and an angle sensor. The rotating component is rotatably arranged on the fixed component. The rotating component comprises a first positioning part and a second positioning part. The first positioning part and the second positioning part are arranged in sequence along the direction of the rotation shaft of the rotating component, and the plane passing through the rotation shaft and the first positioning part is different from the plane passing through the rotation shaft and the second positioning part. The first bearing is arranged between the fixed component and the rotating component. The elastic member is used to press the first positioning part and the second positioning part against the drum. The angle sensor is used to detect the angle of the rotating component. The fixed component and / or the rotating component is provided with an oil injection channel for lubricating the first bearing.

[0007] Beneficial effects: the elastic member presses the first positioning part and the second positioning part towards the winding drum, the first positioning part and the second positioning part are different in surface and position in the axial direction, thus the first positioning part and the second positioning part switch the contact position with the cable as the cable is wound and unwound on the winding drum, the angle of the rotating assembly changes, the angle sensor can send a signal when the angle changes, so as to stop the unwinding of the cable, and over-winding protection is realized; by setting the first bearing between the fixed assembly and the rotating assembly, and further adding an oil injection channel, the frictional resistance between the fixed assembly and the rotating assembly can be effectively reduced, and the rotation of the rotating assembly is smoother.

[0008] In an alternative embodiment, the fixed assembly and the rotating assembly respectively shield two ends of the first bearing in the axial direction.

[0009] Beneficial effects: by shielding the ends of the first bearing, the connection part of the first bearing and the rotating assembly can be hidden inside the over-winding protection device, the risk of impurities invading the connection part from the outside is reduced, the lubricating medium is prevented from being contaminated, and the rotation of the rotating assembly is smoother.

[0010] In an alternative embodiment, the fixed assembly includes a first arm, the rotating assembly includes a first connecting shaft, the first bearing is arranged on the first arm, the first connecting shaft is inserted into the first bearing, and the oil injection channel is located on the first connecting shaft.

[0011] Beneficial effects: by arranging the oil injection channel on the first connecting shaft, the radial and axial dimensions of the first connecting shaft can be fully utilized to process an oil injection channel with required dimensions, so that the structure of the over-winding protection device is more compact, and the miniaturization design of the over-winding protection device is facilitated.

[0012] In an alternative embodiment, the oil injection channel includes a communicating axial section and a radial section, the axial section has an oil injection hole, and the radial section has an oil outlet hole; the rotating assembly further includes an oil injection nozzle and an oil cap, the oil injection nozzle is arranged in the oil injection hole, and the oil cap is arranged on the oil injection nozzle.

[0013] Beneficial effects: the oil injection nozzle is used to adapt to external oil injection equipment to facilitate the injection of lubricating medium into the oil injection channel, and the oil cap can seal the oil injection nozzle, which can prevent the lubricating medium from leaking and being contaminated; at the same time, the oil injection nozzle is installed by using the axial end face of the first connecting shaft, so that the structure of the over-winding protection device is more compact, and the miniaturization design of the over-winding protection device is facilitated.

[0014] In an alternative embodiment, the first arm includes a through hole, the first connecting shaft passes through the through hole, and the oil outlet hole communicates the gap between the first connecting shaft and the through hole.

[0015] Beneficial effects: part of the lubricating medium can be stored in the gap between the first connecting shaft and the via, thereby improving the oil storage capacity of the over-discharge protection device, reducing the oil injection frequency, and making the use and maintenance of the over-discharge protection device more convenient.

[0016] In an alternative embodiment, the rotating assembly further comprises a second arm arranged on the first connecting shaft, the elastic member comprises a torsion spring, the torsion spring is sleeved on the first connecting shaft, and two torsion arms of the torsion spring are respectively in contact with the first arm and the second arm; wherein the second arm is located on the side of the first arm away from the first bearing.

[0017] Beneficial effects: on the one hand, the structure of the torsion spring is compact, which is conducive to the miniaturization design of the over-discharge protection device; on the other hand, the second arm is located on the side of the first arm away from the first bearing, so that the torsion spring and the first bearing are respectively located on both sides of the first arm, thereby making full use of the axial dimension of the first connecting shaft while avoiding the mutual interference of the torsion spring and the first bearing.

[0018] In an alternative embodiment, the angle sensor comprises a contact switch arranged on the fixed assembly and located on the rotation path of the second arm.

[0019] Beneficial effects: the second arm also plays a lever amplification role, the contact switch detects the angle change of the rotating assembly through the second arm, which improves the detection sensitivity while integrating multiple functions of the second arm, so that the structure of the over-discharge protection device is more compact, which is conducive to the miniaturization design of the over-discharge protection device.

[0020] In an alternative embodiment, the rotating assembly further comprises a roller, the axis of the roller is parallel to the rotating shaft, the roller comprises the first positioning part and the second positioning part, the diameter of the first positioning part is smaller than the diameter of the second positioning part; the rotating assembly further comprises a third arm and a second connecting shaft, one end of the third arm is connected to the first connecting shaft, the other end of the third arm is connected to the second connecting shaft, and the roller is sleeved on the second connecting shaft.

[0021] Beneficial effects: when the cable is reeled in and out, the roller can rotate with the drum, thereby reducing the resistance exerted by the over-discharge protection device on the drum, and making the reeling and unreeling of the cable more smooth.

[0022] In an alternative embodiment, the roller further comprises a transition part located between the first positioning part and the second positioning part.

[0023] Beneficial effect: the transition part makes the diameter of the roller change smoothly, avoids forming a step between the first positioning part and the second positioning part, and enables the cable to smoothly switch the contact position with the first positioning part and the second positioning part during the winding process.

[0024] In a second aspect, the utility model also provides a winding equipment, including winch and the utility model provides over discharge protection device, the winch includes rotatable winding drum, over discharge protection device sets up on the winch.

[0025] Beneficial effect: the winding equipment includes the over discharge protection device provided by the utility model, and therefore has the beneficial effects brought by the over discharge protection device, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 It is a front view schematic diagram of the over discharge protection device of the embodiment of the utility model;

[0028] Figure 2 It is a test schematic diagram of the over discharge protection device of the embodiment of the utility model;

[0029] Figure 3 It is Figure 2 The sectional view schematic diagram in A-A plane;

[0030] Figure 4 It is a partial structure schematic diagram of the rotating assembly of the embodiment of the utility model;

[0031] Figure 5 It is Figure 2 The sectional view schematic diagram in B-B plane;

[0032] Figure 6 It is a structure schematic diagram of the winding equipment of the embodiment of the utility model.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 1, fixed assembly; 101, first arm; 102, base; 103, positioning screw; 2, rotating assembly; 201, oil injection channel; 202, first connecting shaft; 203, oil injection nozzle; 204, oil cap; 205, second arm; 206, circlip; 207, roller; 2071, first positioning part; 2072, second positioning part; 2073, transition part; 208, third arm; 209, second connecting shaft; 3, first bearing; 301, shaft sleeve; 302, bearing shell; 4, elastic member; 5, angle sensor; 6, winding drum; 7, cable. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0036] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and the like are inclusive and therefore specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof.

[0037] Although the terms first, second, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to differentiate one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and the like are used herein to describe various elements, components, regions, layers and / or sections, and do not imply an order or sequence unless the context clearly indicates otherwise. In addition, in the description of the present application, unless otherwise specifically stated and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "end," "length," "inner," "outer," etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation, in addition to those depicted in the figure. For example, if the mechanism in the figure is flipped, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The mechanism may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0039] There are two types of over-discharge protection for hoisting equipment: contact and non-contact. Contact over-discharge protection detects changes in the number of turns of the cable by pressing a rotating bracket on the cable, thereby triggering a contact switch to generate an over-discharge signal.

[0040] However, it has been noted that the rotating support sometimes experiences difficulty in rotating smoothly, leading to a decrease in response sensitivity. This not only affects the use of the winch equipment but may also increase safety risks.

[0041] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0042] Reference Figure 1 , Figure 2 , Figure 3 According to an embodiment of the present invention, an over-discharge protection device is provided, comprising a fixed component 1, a rotating component 2, a first bearing 3, an elastic element 4, and an angle sensor 5. The rotating component 2 is rotatably mounted on the fixed component 1. The rotating component 2 includes a first positioning part 2071 and a second positioning part 2072. The first positioning part 2071 and the second positioning part 2072 are arranged sequentially along the direction of the rotation axis of the rotating component 2, and the plane passing through the rotation axis and the plane of the first positioning part 2071 (shown as S1 in the figure) and the plane passing through the rotation axis and the plane of the second positioning part 2072 (shown as S2 in the figure) are opposite planes. The first bearing 3 is disposed between the fixed component 1 and the rotating component 2. The elastic element 4 is used to press the first positioning part 2071 and the second positioning part 2072 against the drum 6. The angle sensor 5 is used to detect the angle of the rotating component 2. The fixed component 1 and / or the rotating component 2 are provided with an oil injection channel 201 for lubricating the first bearing 3.

[0043] The over-releasing protection device is suitable for providing over-releasing protection for a hoisting device and other devices with cable releasing function (for example, a device for releasing a shutter). For the convenience of description, it is assumed below that the first positioning part 2071 is used for contacting and positioning the cable 7 as a safety load shedding ring (not allowed to be released), and the second positioning part 2072 is used for contacting and positioning the cable 7 allowed to be released, Figure 2 The drum 6 and the cable 7 thereon are schematically shown by a dashed line.

[0044] At this time, if a plane of the rotating shaft of the over-rotation assembly 2 and the rotating shaft of the drum 6 is taken as a reference plane (shown by S3 in the figure), the plane of the over-rotation shaft and the first positioning part 2071 forms a first included angle with the reference plane, the plane of the over-rotation shaft and the second positioning part 2072 forms a second included angle with the reference plane, and the first included angle is greater than the second included angle.

[0045] The elastic member 4 presses the first positioning part 2071 and the second positioning part 2072 towards the drum 6, the first positioning part 2071 and the second positioning part 2072 are out of plane, and the positions are different in the axial direction, so that the first positioning part 2071 and the second positioning part 2072 switch the contacting and positioning with the cable 7 as the cable 7 is released on the drum 6, the angle of the over-rotation assembly 2 changes, and the angle sensor 5 can send a signal when the angle changes, so as to stop the release of the cable 7, and over-releasing protection is realized.

[0046] Taking the over-releasing protection device sending a signal when there are three turns of the cable 7 as an example, since the first included angle is greater than the second included angle, when the number of turns of the cable 7 on the drum 6 is greater than three turns, the second positioning part 2072 contacts and positions the cable 7 allowed to be released, the first positioning part 2071 does not contact the cable 7, and the over-rotation assembly 2 is at the second included angle; when the number of turns of the cable 7 on the drum 6 is equal to three turns, the cable 7 corresponding to the second positioning part 2072 is completely released, the second positioning part 2072 loses support, the over-rotation assembly 2 is further pressed towards the drum 6 under the action of the elastic member 4, so that the first positioning part 2071 contacts and positions the cable 7, and the over-rotation assembly 2 is at the first included angle. By detecting the angle of the over-rotation assembly 2, the release state of the cable 7 can be reflected.

[0047] It should be noted that the rotation of the over-rotation assembly 2 is not sensitive enough, which can easily lead to safety risks. By arranging the first bearing 3 between the fixed assembly 1 and the over-rotation assembly 2, and further adding the oil injection channel 201, the frictional resistance between the fixed assembly 1 and the over-rotation assembly 2 can be effectively reduced, and the rotation of the over-rotation assembly 2 is more smooth. At the same time, the lubricating medium (lubricating oil or lubricating grease) can also reduce the wear of the first bearing 3, and improve the service life of the over-releasing protection device.

[0048] In addition, in some use scenarios, dust, hair and other impurities exist in the external environment. If the impurities invade the position where the rotating pair is located, not only the lubricating medium will be contaminated, but also the rotating pair will be stuck, resulting in failure of the rotating assembly 2.

[0049] Therefore, in some embodiments, the fixed assembly 1 and the rotating assembly 2 respectively shield both ends of the first bearing 3 in the axial direction. By shielding the ends of the first bearing 3, the connection part of the first bearing 3 and the rotating assembly 2 can be hidden inside the over-discharge protection device, reducing the risk of impurities invading the connection part, avoiding contamination of the lubricating medium, and making the rotation of the rotating assembly 2 more smooth.

[0050] For example, referring to Figure 3 In some embodiments, the first bearing 3 is a sliding bearing, the first bearing 3 includes a bushing 302 and a sleeve 301, the sleeve 301 is fixedly arranged on the fixed assembly 1, the bushing 302 is fixedly arranged in the sleeve 301, and the rotating assembly 2 is rotatably inserted in the bushing 302. Wherein, one end of the bushing 302 is shielded by the sleeve 301 and the fixed assembly 1, and the other end of the bushing 302 is shielded by the rotating assembly 2, thereby reducing the risk of impurities invading the connection part of the bushing 302 and the rotating assembly 2. At the same time, using a sliding bearing also helps to reduce the size of the connection part, making the structure of the over-discharge protection device more compact and suitable for miniaturization.

[0051] Continuing to refer to Figure 3 Optionally, in some embodiments, the fixed assembly 1 includes a first arm 101, the rotating assembly 2 includes a first connecting shaft 202, the first bearing 3 is arranged on the first arm 101, the first connecting shaft 202 is inserted in the first bearing 3, and the oil injection channel 201 is located on the first connecting shaft 202.

[0052] By arranging the oil injection channel 201 on the first connecting shaft 202, the radial and axial dimensions of the first connecting shaft 202 can be fully utilized to process the oil injection channel 201 with the required size, making the structure of the over-discharge protection device more compact and facilitating the miniaturization design of the over-discharge protection device.

[0053] In particular, referring to Figure 1 In some embodiments, the fixed assembly 1 further includes a base 102, the base 102 is used to be mounted on a target device (such as a hoisting device), the first arm 101 is arranged on the base 102 and protrudes from the surface of the base 102, so that the connection part of the fixed assembly 1 and the rotating assembly 2 is away from the base 102, having more abundant assembly and installation space. In combination with Figure 3 and Figure 4In some embodiments, the oil injection channel 201 may include a connected axial section and a radial section, the axial section having an oil injection hole and the radial section having an oil outlet hole. This design further simplifies the structure of the oil injection channel 201 and makes the oil injection channel 201 easier to process.

[0054] In some embodiments, the rotating assembly 2 further includes an oil nozzle 203 and an oil cap 204. The oil nozzle 203 is disposed in the oil filling hole, and the oil cap 204 is disposed on the oil nozzle 203. The oil nozzle 203 is used to adapt to an external oiling device to inject lubricating medium into the oil filling channel 201. The oil cap 204 can seal the oil nozzle 203, preventing lubricating medium leakage and contamination. Simultaneously, the oil nozzle 203 is mounted on the axial end face of the first connecting shaft 202, facilitating the machining of the connecting structure of the oil nozzle 203 on the axial end face (e.g., ...). Figure 3 (shown internal thread), thereby making full use of the axial dimension of the first connecting shaft 202, making the structure of the over-discharge protection device more compact, which is conducive to the miniaturization design of the over-discharge protection device.

[0055] In some embodiments, the first arm 101 includes a through hole through which the first connecting shaft 202 passes, and an oil outlet connects the gap between the first connecting shaft 202 and the through hole. Clearly, the first connecting shaft 202 and the through hole are clearance-fitted, allowing a portion of the lubricating medium to be stored within the gap, thereby improving the oil storage capacity of the over-discharge protection device, reducing the frequency of oil injection, and making the use and maintenance of the over-discharge protection device more convenient.

[0056] It is understandable that the rotating joint is formed by the fit between the hole and the shaft, taking into account... Figure 3 In the illustrated embodiment, the first bearing 3 is a sliding bearing. Therefore, a design is adopted in which the fixed component 1 includes a hole structure (a bushing 301 fixed together with the fixed component 1) and the rotating component 2 includes a shaft structure (a first connecting shaft 202). In other embodiments not shown, equivalently, a design can also be adopted in which the fixed component 1 includes a shaft structure and the rotating component 2 includes a hole structure. In this case, the oil injection channel 201 can be set on the shaft structure of the fixed component 1. Utilizing the radial and axial dimensions of the shaft structure is beneficial for the miniaturization design of the over-discharge protection device.

[0057] In some embodiments, the rotating assembly 2 further includes a second arm 205, which is disposed on the first connecting shaft 202. The elastic element 4 includes a torsion spring, which is sleeved on the first connecting shaft 202. The two torsion arms of the torsion spring are respectively in contact with and positioned with the first arm 101 and the second arm 205. The second arm 205 is located on the side of the first arm 101 away from the first bearing 3.

[0058] On the one hand, the torsion spring is compact in structure, which is conducive to the miniaturized design of the overdischarge protection device; on the other hand, the second arm 205 is located on the side of the first arm 101 away from the first bearing 3, so that the torsion spring and the first bearing 3 are respectively located on the two sides of the first arm 101, while fully utilizing the axial dimension of the first connecting shaft 202, the torsion spring and the first bearing 3 are also avoided from interfering with each other.

[0059] It can be understood that the torsion spring is prone to fatigue after long-term use, resulting in a decrease in the elastic coefficient. If the torsion spring is replaced, the rotary assembly 2 needs to be disassembled, resulting in a high maintenance cost. Therefore, in some embodiments, a plurality of positioning points are provided on the first arm 101 and / or the second arm 205. By changing the positioning point contacted by the torsion arm of the torsion spring, the tensioning degree of the torsion spring can be adjusted to ensure that the torsion spring can provide sufficient force to press the rotary assembly 2 towards the winding drum 6.

[0060] Exemplarily, referring to Figure 2 , the first arm 101 is provided with a plurality of positioning points, and the fixing assembly 1 further comprises a positioning screw 103, which can be arranged on any one of the positioning points. The torsion arm of the torsion spring abuts against the positioning screw 103 to realize contact positioning with the positioning point. When the torsion force is insufficient, it is only necessary to change the installation position of the positioning screw 103 to further pre-tighten the torsion spring, thereby improving the service life of the torsion spring and reducing the maintenance cost.

[0061] Optionally, in some embodiments, the rotary assembly 2 further comprises a snap spring 206, which is buckled in the snap spring 206 groove of the first connecting shaft 202. The snap spring 206 and the fixing assembly 1 (here, the first arm 101) are in contact with each other, thereby limiting the first connecting shaft 202 in the axial direction and ensuring that the axial space of the first connecting shaft 202 is accurately allocated to the torsion spring and the first bearing 3.

[0062] In some embodiments, the angle sensor 5 comprises a contact switch, which is arranged on the fixing assembly 1 and located on the rotation path of the second arm 205.

[0063] Specifically, the contact switch can be arranged on the base 102. The second arm 205 plays a role of lever amplification when the torsion spring is installed. The contact switch detects the angle change of the rotary assembly 2 through the second arm 205, thereby improving the detection sensitivity and integrating multiple functions of the second arm 205, so that the structure of the overdischarge protection device is more compact, which is conducive to the miniaturized design of the overdischarge protection device.

[0064] Referring to Figure 4 and Figure 5In some embodiments, the rotating assembly 2 further comprises a roller 207, an axis of the roller 207 is parallel to the rotating shaft, the roller 207 comprises a first positioning part 2071 and a second positioning part 2072, a diameter of the first positioning part 2071 is smaller than a diameter of the second positioning part 2072; the rotating assembly 2 further comprises a third arm 208 and a second connecting shaft 209, one end of the third arm 208 is connected to the first connecting shaft 202, the other end of the third arm 208 is connected to the second connecting shaft 209, the roller 207 is sleeved on the second connecting shaft 209.

[0065] When the cable 7 is reeled in or out, the roller 207 can rotate along with the drum 6, so as to reduce the resistance applied by the over-reeling protection device to the drum 6, and make the reeling in or out of the cable 7 more smooth. Optionally, the roller 207 and the second connecting shaft 209 can be rotatably connected through a second bearing, so as to further reduce the resistance and make the reeling in or out of the cable 7 more smooth.

[0066] In some embodiments, the roller 207 further comprises a transition part 2073 between the first positioning part 2071 and the second positioning part 2072. The transition part 2073 makes the diameter of the roller 207 change smoothly, avoids forming a step between the first positioning part 2071 and the second positioning part 2072, and makes the cable 7 be able to switch the contact position with the first positioning part 2071 and the second positioning part 2072 smoothly during the reeling process.

[0067] Referring to Figure 6 In a second aspect, the utility model further provides a winch equipment, including winch and the utility model provides over-reeling protection device, winch includes rotatable drum 6, over-reeling protection device sets up on winch.

[0068] The winch equipment comprises the over-reeling protection device provided by the utility model, and thus has the beneficial effects brought by the over-reeling protection device, which will not be repeated here.

[0069] Although the embodiments of the utility model are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An overdischarge protection device, characterized by The utility model relates to a fixed assembly (1);Rotary assembly (2) rotatably arranged on the fixed assembly (1), the rotary assembly (2) includes first positioning portion (2071) and second positioning portion (2072), first positioning portion (2071) and second positioning portion (2072) are sequentially arranged along the direction of the rotation axis of rotary assembly (2), and the plane through rotation axis and first positioning portion (2071) and the plane through rotation axis and second positioning portion (2072) are different surfaces; First bearing (3) is arranged between the fixed assembly (1) and the rotary assembly (2); Elastic member (4) is used to press first positioning portion (2071) and second positioning portion (2072) to reel (6); Angle sensor (5) is used for detecting the angle of rotary assembly (2); Wherein, the fixed assembly (1) and / or the rotary assembly (2) are provided with oil injection channel (201) for lubricating the first bearing (3). The fixed assembly (1) and the rotary assembly (2) respectively block the two ends of the first bearing (3) in the axial direction. The fixed assembly (1) includes a first arm (101), the rotary assembly (2) includes a first connecting shaft (202), the first bearing (3) is arranged on the first arm (101), the first connecting shaft (202) is inserted in the first bearing (3), and the oil injection channel (201) is located on the first connecting shaft (202).

2. Overdischarge protection device according to claim 1, characterized in that The oil injection channel (201) includes a communicating axial section and a radial section, the axial section has an oil injection hole, and the radial section has an oil outlet hole.

3. The overdischarge protection device of claim 1, wherein The rotary assembly (2) further includes an oil injection nozzle (203) and an oil cap (204), the oil injection nozzle (203) is arranged in the oil injection hole, and the oil cap (204) is arranged on the oil injection nozzle (203).

4. Overdischarge protection device according to claim 3, characterized in that The first arm (101) includes a through hole, the first connecting shaft (202) passes through the through hole, and the oil outlet hole communicates the gap between the first connecting shaft (202) and the through hole. The rotary assembly (2) further includes a second arm (205), the second arm (205) is arranged on the first connecting shaft (202), the elastic member (4) includes a torsion spring, the torsion spring is sleeved on the first connecting shaft (202), and the two torsion arms of the torsion spring are respectively in contact with the first arm (101) and the second arm (205).

5. Overdischarge protection device according to claim 4, characterized in that Wherein, the second arm (205) is located on the side, away from the first bearing (3), of the first arm (101).

6. Overdischarge protection device according to claim 5, characterized in that The angle sensor (5) includes a contact switch, the contact switch is arranged on the fixed assembly (1) and located on the rotation path of the second arm (205). ​ 7. Overdischarge protection device according to claim 6, characterized in that ​ 8. The over-discharge protection device of claim 3, wherein, The rotating assembly (2) further comprises a roller (207), an axis of the roller (207) is parallel to the rotating shaft, the roller (207) comprises the first positioning part (2071) and the second positioning part (2072), a diameter of the first positioning part (2071) is less than a diameter of the second positioning part (2072); The rotating assembly (2) further comprises a third arm (208) and a second connecting shaft (209), one end of the third arm (208) is connected to the first connecting shaft (202), the other end of the third arm (208) is connected to the second connecting shaft (209), and the roller (207) is sleeved on the second connecting shaft (209).

9. Overdischarge protection device according to claim 8, characterized in that The roller (207) further comprises a transition part (2073) between the first positioning part (2071) and the second positioning part (2072).

10. A hoisting apparatus characterized by, Comprising: A winch comprising a rotatable drum (6); The overdischarge protection device according to any one of claims 1 to 9 is arranged on the winch.

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