Telescopic enhanced rear towing hook device and crane

Abstract

The utility model discloses a telescopic enhanced rear towing hook device and a crane, the rear towing hook device comprises two rear towing hooks, and the two rear towing hooks are symmetrically arranged below a rear fixed leg; the rear fixing leg comprises an installation base plate, front vertical plates are fixedly installed on the two sides of the installation base plate, one side of the installation base plate and one side of each front vertical plate are jointly and fixedly connected with a middle vertical plate, and a rear vertical plate is installed on one side of the middle vertical plate. The rear towing hook device composed of the hook seat with the sliding groove, the telescopic towing lug plate, the locatable pin shaft and the push-pull connecting handle has an extending state and a retracting state, the bottom structure and space of the rear fixed leg of the crane are effectively utilized, and the box-shaped structure at the bottom of the towing hook is convenient to use. The structural strength of the towing hook device is improved, the fixing leg structure is reinforced, the overall structural strength is higher, larger traction force can be borne, and the towing hook device is suitable for the working condition scene that a large-traction-force trailer is needed when an oil field vehicle is prone to sinking.

Description

Technical Field

[0001] The utility model relates to the field of wheeled lifting machinery, in particular to a telescopic enhanced rear traction hook device and a crane. Background Art

[0002] Wheeled cranes are generally heavy and have poor operating and driving conditions. Vehicles can easily get stuck in muddy or bumpy roads and become unable to drive. Due to the heavy weight of the crane, it is generally not possible to directly lift and transport it. In most cases, the crane is towed out of the sunken road surface by traction. Therefore, the strength and reliability of the towed hook device are very important.

[0003] The rear traction hook is generally fixed on the rear vertical plate of the rear fixed leg at the rear end of the frame, usually welded. At present, the rear traction hook of wheeled crane can be mainly divided into three types according to the structural form: the first type is welded on the rear vertical plate of the rear fixed leg, such as Figure 8 As shown, the towing hook 3 is connected and fixed to the rear vertical plate 2-1 of the rear fixed leg 0-2 by welding. The towing hook 0-3 is composed of a towing ear 3-1, a hanging hole 1 3-2, and a hanging hole 2 3-3. The main disadvantages of this towing hook device are: (1) the towing ear 3-1 is a protruding structure, which will affect the installation of the spare tire (the spare tire of the wheeled crane is usually installed on the rear vertical plate 2-1 of the rear fixed leg 0-2); (2) although the connection weld between the towing hook 0-3 and the rear fixed leg 0-2 is relatively long, there is stress concentration in the weld at the hanging hole, so there is still a risk of weld cracking during use; the second towing hook device is embedded, such as Fig. 9 As shown, the traction ear 3-1 of the traction hook 0-3 is embedded in the rear sealing plate of the rear section 0-1 of the frame. This structural form is mainly used for the overlapping connection between the rear fixed leg 0-2 and the rear section 0-1 of the frame. Since there is a movable leg inside the rear fixed leg 2, in order to ensure that the extension and retraction of the movable leg is not affected, the height of the traction hook 0-3 is limited, that is, it can only be set above the rear fixed leg 0-2. In actual use, the lower position is more in line with the traction condition, because when the vehicle tire sinks into the ground, providing the vehicle with an upward component force is more conducive to successful towing. Similarly, this structural form of the traction hook has the problem of insufficient weld length and affecting the placement of the spare tire; the third traction hook device is a widened traction hook, such as Fig.10 As shown, the towing hook 0-3 is mainly composed of a towing ear 3-1, a square plate 3-2, and a bent plate 3-3. The three form a small box structure and are connected to the two side webs of the rear section 0-2 of the frame, which improves the structural strength of the towing hook to a certain extent. However, the height position is still limited by the fixed legs below, and this widened structure must adapt to the diameter of the spare tire at the rear. When the spare tire diameter is larger, the box structure of the towing hook 0-3 must be made longer, which will affect the structural strength on the one hand, and affect the layout of the hydraulic pipelines of the crane legs and the use of the adjusting bolts on the fixed legs on the other hand.

[0004] In combination with the above solution, the existing rear traction hook device has the following problems:

[0005] 1. The bearing capacity is weak. Due to the limitation of the structure, it cannot withstand large traction force and is not suitable for trailers in harsh working conditions such as oil field operation vehicles and mountain operation vehicles.

[0006] 2. It affects the use of other functions at the rear of the vehicle, the space utilization is low, and the placement of the spare tire is limited. The protruding part of the towing hook increases the overall length of the frame, and when the fixed leg acts as a rear guard, it also affects the flatness requirements of the rear guard;

[0007] 3. The traction effect is poor, the force on the structural parts is unreasonable, and the position of the traction hook is too high due to the influence of the rear fixed legs, which is not conducive to the actual trailer scene. In addition, the length of the connecting weld of the traction hook device is short, which is prone to cracking or deforming the rear fixed leg box and affecting the extension and retraction of the movable legs;

[0008] 4. The rear towing hook is exposed at the rear end of the vehicle. When the vehicle is rear-ended, the towing hook will cause more serious damage to the rear vehicle or personnel.

[0009] In view of the above problems, the present invention develops a retractable enhanced rear traction hook device and a crane, which can not only meet the large traction force usage scenarios of the crane but also solve the problem of occupying the rear space of the vehicle, and at the same time has good practicality, reliability and easy operation. Utility Model Content

[0010] The technical problem to be solved by the utility model is to provide a retractable enhanced rear towing hook device and a crane in view of the deficiencies of the above-mentioned prior art, which is used to solve the problem of insufficient strength of conventional towing hooks when a wheeled crane is stuck, and solve the problem that the existing rear towing hook affects the arrangement of components such as the rear spare tire by changing the structural form. The rear towing hook device with a new structural form has more flexible operability, greater load-bearing capacity, higher reliability and safety.

[0011] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0012] A retractable enhanced rear traction hook device comprises two rear traction hooks, and the two rear traction hooks are symmetrically installed under the rear fixed legs;

[0013] The rear fixed leg includes a mounting base plate, front vertical plates are fixedly mounted on both sides of the mounting base plate, the mounting base plate and one side of the front vertical plate are jointly fixedly connected to the neutral plate, the rear vertical plate is mounted on one side of the neutral plate, a reinforcing rib plate is jointly mounted between the front vertical plate, the neutral plate and the rear vertical plate, and the reinforcing rib plate passes through the neutral plate through the leg overlap block on the neutral plate, and a rectangular hole is opened below the rear vertical plate;

[0014] The rear traction hook comprises an ear plate, a hook seat and a pin shaft, wherein the hook seat is installed at the bottom of the rear traction hook, the ear plate is slidably connected to the hook seat, the ear plate is integrally arranged at the end of the ear plate, and the ear plate corresponds to the rectangular hole, so that the ear plate can extend outward and retract in the rectangular hole, the hook seat is provided with a pin shaft hole, the pin shaft is inserted into the pin shaft hole, and the hook seat and the bottom of the rear fixed leg form a box-type structure;

[0015] A traction hole is provided at one end of the ear plate for hooking during traction, and a pin hole a and a pin hole b are provided on the surface of the ear plate. The pin hole a and the pin hole b are respectively corresponding to when the ear plate is in an extended state and a retracted state, and a buckle is inserted at the end of the pin to fix the ear plate;

[0016] The end of the ear plate extends beyond the rear upright plate and acts as a towing hook. At this time, the pin hole on the hook seat is concentric with the pin hole a on the ear plate. When the towing hook is not in use, the ear plate is retracted by removing the pin so that its end is flush with the rear upright plate. At this time, the pin hole on the hook seat is concentric with the pin hole b on the ear plate.

[0017] Preferably, the hook seat includes a base plate, a baffle plate and a partition vertical plate. The number of the partition vertical plates on each base plate is set to three, and two groups of guide grooves are formed between the three partition vertical plates. Ear plates in groups of two are correspondingly installed in the two groups of guide grooves, and a baffle plate is fixedly installed on the top of the partition vertical plate to prevent the ear plate from falling out during the extension and retraction process. The partition vertical plate has guiding and fixing functions.

[0018] Preferably, each group of ear plates is connected into a whole through a connecting handle, the connecting handle includes a flange, and a mounting hole is provided on the flange, two second threaded holes are provided on the side of the ear plate, and a first bolt is installed in the two second threaded holes for installing the connecting handle. The connecting handle connects the two ear plates in parallel so that multiple ear plates can be extended and retracted synchronously.

[0019] Preferably, the hook seat is connected and fixed to the leg overlap block, the reinforcing rib plate, the front vertical plate, the middle vertical plate and the rear vertical plate at the bottom of the rear fixed leg by welding.

[0020] Preferably, the base plate is provided with a plurality of first threaded holes, second bolts are provided in the first threaded holes, the bottom of the base plate is connected to a fixing plate via the second bolts, and the fixing plate is provided with a through hole, and the second bolts pass through the through hole to install the combined structure of the hook seat and the fixing plate on the rear fixed leg.

[0021] Preferably, the cross-sectional shape of the ear plate is set to be a rectangle, the number of the pin holes a and the pin holes b on each ear plate is set to two, and the two pin holes a and the two pin holes b are staggered.

[0022] Preferably, the distance between the two hook seats can be adjusted through first threaded holes at different positions on the fixing plate.

[0023] A crane comprises the above-mentioned rear traction hook device and a frame, wherein the rear fixed legs of the rear traction hook device are fixed on the frame, and the bottom of the rear vertical plate is lower than the bottom end of the frame.

[0024] The utility model has the following beneficial effects:

[0025] 1. The rear traction hook device, which consists of a hook seat with a slide, a retractable traction ear plate, a positionable pin shaft, and a push-pull connection handle, has two states: extended and retracted. It effectively utilizes the bottom structure and space of the rear fixed leg of the crane. The box-shaped structure at the bottom of the traction hook improves the structural strength of the traction hook device itself and strengthens the fixed leg structure. The overall structural strength is higher and can carry greater traction. It is suitable for oil field vehicles and other working conditions where vehicles are prone to getting stuck and require large traction force trailers;

[0026] 2. The telescopic structure of the traction lug does not affect the arrangement of the rear assembly parts of the vehicle, which improves the space utilization rate of the rear of the vehicle. The rear fixed legs of the wheeled crane serve as rear protection, and the non-protruding rear traction hook better meets the safety requirements of rear protection;

[0027] 3. The rear towing hook device is fixed at the bottom of the rear fixed leg, and the force-bearing mode of the towing ear plate is more reasonable. On the one hand, the towing hook device is located lower, which is more conducive to towing from the rear of the vehicle when it is stuck. On the other hand, because it is fixed on the rear fixed leg pad, rib plate and vertical plate, a longer weld length can be obtained, and the weld stress is smaller, which can effectively avoid the problem of weld cracking in the existing structure or causing box-shaped deformation of the rear fixed leg. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural arrangement diagram of an enhanced rear traction hook device (one rear traction hook is omitted) provided in the first embodiment of the utility model;

[0029] Figure 2 This is a perspective view of the overall structure of the enhanced rear traction hook device provided in the second embodiment of the utility model;

[0030] Figure 3 It is a partial structural stereogram of the rear traction hook provided by the utility model;

[0031] Figure 4 It is a three-dimensional diagram of the ear plate provided by the utility model;

[0032] Figure 5 It is a three-dimensional diagram of the connecting handle provided by the utility model;

[0033] Figure 6 It is a schematic diagram of the extended state of the traction ear plate of the enhanced rear traction hook device provided by the utility model;

[0034] Figure 7It is a schematic diagram of the traction ear plate of the enhanced rear traction hook device provided by the utility model in a retracted state;

[0035] Figure 8 It is a schematic diagram of a rear traction hook device of the first structural form in the prior art provided by the utility model;

[0036] Fig. 9 It is a schematic diagram of a rear traction hook device of the second structural form in the prior art provided by the utility model;

[0037] Fig.10 It is a schematic diagram of a rear traction hook device of the third structural form in the prior art provided by the utility model.

[0038] Among them are:

[0039] Frame-1; Rear fixed legs-2; Rear towing hook-3;

[0040] Installation base plate-20; leg overlap block-21; reinforcing rib plate-22; front vertical plate-23; middle plate-24; rear vertical plate-25; 26-fixing plate;

[0041] Ear plate-31; hook seat-32; connecting handle-33; buckle-34; pin-35; 36-first bolt;

[0042] Rectangular hole - 251;

[0043] First threaded hole-261; second bolt-262;

[0044] Pin shaft hole a-311; Pin shaft hole b-312; Second threaded hole-313; Traction hole-314;

[0045] Bottom plate-321; baffle-322; partition plate-323;

[0046] Flanged edge-331; Mounting hole-332;

[0047] Pin hole-3231. DETAILED DESCRIPTION

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

[0049] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not indicate the importance of the components, and therefore cannot be understood as a limitation on the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0050] like Figure 1-7 As shown, a retractable enhanced rear traction hook device includes two rear traction hooks 3, and the two rear traction hooks 3 are symmetrically installed under the rear fixed leg 2;

[0051] The rear fixed leg 2 includes a mounting base plate 20, on both sides of which front vertical plates 23 are fixedly mounted, the mounting base plate 20 and one side of the front vertical plate 23 are fixedly connected to a neutral plate 24, one side of the neutral plate 24 is mounted with a rear vertical plate 25, a reinforcing rib plate 22 is mounted between the front vertical plate 23, the neutral plate 24 and the rear vertical plate 25, and the reinforcing rib plate 22 penetrates the neutral plate 24 through the leg lap block 21 on the neutral plate 24, and a rectangular hole 251 is opened below the rear vertical plate 25;

[0052] The rear traction hook 3 includes an ear plate 31, a hook seat 32 and a pin 35, wherein the hook seat 32 is installed at the bottom of the rear traction hook 3, the ear plate 31 is slidably connected to the hook seat 32, the ear plate 31 is integrally arranged at the end of the ear plate 31, and the ear plate 31 corresponds to the rectangular hole 251, so that the ear plate 31 can extend and retract in the rectangular hole 251, the hook seat 32 is provided with a pin hole 3231, the pin 35 is inserted into the pin hole 3231, the hook seat 32 and the bottom of the rear fixed leg 2 form a box-type structure, the hook seat 32 is connected and fixed with the leg overlap block 21, the reinforcing rib plate 22, the front vertical plate 23, the middle plate 24, and the rear vertical plate 25 at the bottom of the rear fixed leg 2 to form a closed box-type structure, thereby improving the structural strength of the traction hook device itself and strengthening the fixed leg structure;

[0053] A traction hole 314 is provided at one end of the ear plate 31 for hanging during traction. A pin hole a311 and a pin hole b312 are provided on the surface of the ear plate 31. The pin hole a311 and the pin hole b312 are respectively corresponding to the ear plate 31 being in an extended state and a retracted state when the pin 35 is inserted, and a buckle 34 is inserted at the end of the pin 35 for fixing the ear plate 31.

[0054] The end of the ear plate 31 extends beyond the rear vertical plate 25 and acts as a towing hook. At this time, the pin hole 3231 on the hook seat 32 is concentric with the pin hole a311 on the ear plate 31. When the towing hook is not in use, the ear plate 31 is retracted by removing the pin 35 so that its end is flush with the rear vertical plate. At this time, the pin hole 3231 on the hook seat 32 is concentric with the pin hole b312 on the ear plate 31.

[0055] Specifically, the hook seat 32 includes a base plate 321, a baffle plate 322 and a partition plate 323. The number of the partition plates 323 on each base plate 321 is set to three, and two groups of guide grooves are formed between the three partition plates 323. Two ear plates 31 are correspondingly installed in the two groups of guide grooves, and a baffle plate 322 is fixedly installed on the top of the partition plate 323 to prevent the ear plate 31 from falling out during the extension and retraction process. The partition plate 323 has a guiding and fixing function.

[0056] Specifically, each group of ear plates 31 is connected into a whole through a connecting handle 33. The connecting handle 33 includes a flange 331, and a mounting hole 332 is provided on the flange 331. Two second threaded holes 313 are provided on the side of the ear plate 31. The two second threaded holes 313 are each installed with a first bolt 36 for installing the connecting handle 33. The connecting handle 33 acts as a push-pull handle, which is convenient for the user to drag the ear plate 31 to achieve the two functional states of extension and retraction. The connecting handle 33 connects the two ear plates 31 in parallel, so that multiple ear plates 31 can be extended and retracted synchronously.

[0057] Specifically, the cross-sectional shape of the ear plate 31 is set to be a rectangle, the size of the rectangle matches the inner diameter of the rectangular hole 251, the number of the pin holes a311 and the pin holes b312 on each ear plate 31 is set to two, and the two pin holes a311 and the two pin holes b312 are staggered.

[0058] Specifically, the distance between the two hook seats 32 can be adjusted by first threaded holes 261 at different positions on the fixing plate 26 , and a plurality of rectangular holes 251 can be provided accordingly. Example

[0059] As a combination of the hook seat 32 and the rear fixed leg 2, the hook seat 32 is connected and fixed to the leg overlap block 21, the reinforcing rib plate 22, the front vertical plate 23, the middle plate 24, and the rear vertical plate 25 at the bottom of the rear fixed leg 2 by welding. Example

[0060] As another combination of the hook seat 32 and the rear fixed leg 2, a plurality of first threaded holes 261 are provided on the bottom plate 321, and second bolts 262 are provided in the first threaded holes 261. The bottom of the bottom plate 321 is connected to the fixing plate 26 through the second bolts 262, and the fixing plate 26 is provided with a through hole. The second bolts 262 pass through the through hole to install the combined structure of the hook seat 32 and the fixing plate 26 on the rear fixed leg 2. For some vehicle models, the rear upright plate 25 of the rear fixed leg 2 of which the extended portion is short and cannot effectively cover the towing hook device, the assembled structure provided in this embodiment is applicable. After the assembled structure is removed, the lowest point of the rear of the vehicle is still on the rear upright plate 25 of the rear fixed leg 2, which does not affect the departure angle and passability of the vehicle.

[0061] A crane comprises the above-mentioned rear traction hook device and a frame 1, wherein the rear fixed leg 2 of the rear traction hook device is fixed on the frame 1, and the bottom of the rear vertical plate 25 is lower than the bottom end of the frame 1.

[0062] When the rear towing hook device is in use, the connecting handle 33 is dragged to make the end of the ear plate 31 extend beyond the rear vertical plate 25, and then locked. At this time, the ear plate 31 acts as a towing hook; when the towing hook is not in use, the ear plate 31 can be retracted by removing the pin shaft 35 so that its end is flush with the rear vertical plate, and accessories such as a spare tire can be carried at the rear.

[0063] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A retractable enhanced rear traction hook device, characterized in that: It comprises two rear traction hooks (3), and the two rear traction hooks (3) are symmetrically installed below the rear fixed legs (2); The rear fixed leg (2) comprises a mounting base (20), a front vertical plate (23) is fixedly mounted on both sides of the mounting base (20), the mounting base (20) and one side of the front vertical plate (23) are fixedly connected to a neutral plate (24), a rear vertical plate (25) is mounted on one side of the neutral plate (24), a reinforcing rib plate (22) is mounted between the front vertical plate (23), the neutral plate (24) and the rear vertical plate (25), and the reinforcing rib plate (22) passes through the neutral plate (24) via a leg lap block (21) on the neutral plate (24), and a rectangular hole (251) is opened below the rear vertical plate (25); The rear traction hook (3) comprises an ear plate (31), a hook seat (32) and a pin (35), wherein the hook seat (32) is mounted on the bottom of the rear traction hook (3), the ear plate (31) and the hook seat (32) are slidably connected, the ear plate (31) is integrally arranged at the end of the ear plate (31), and the ear plate (31) corresponds to the rectangular hole (251), so that the ear plate (31) can extend outward and retract in the rectangular hole (251), the hook seat (32) is provided with a pin hole (3231), the pin (35) is inserted into the pin hole (3231), and the hook seat (32) and the bottom of the rear fixed leg (2) form a box-shaped structure; A traction hole (314) is provided at one end of the ear plate (31) for hooking during traction. A pin hole a (311) and a pin hole b (312) are provided on the surface of the ear plate (31). The pin hole a (311) and the pin hole b (312) are respectively used to insert a pin (35) when the ear plate (31) is in an extended state and a retracted state, and a buckle (34) is inserted into the end of the pin (35) for fixing the ear plate (31). The end of the ear plate (31) exceeds the rear upright plate (25) and acts as a traction hook. At this time, the pin hole (3231) on the hook seat (32) is concentric with the pin hole a (311) on the ear plate (31). When the traction hook is not in use, the ear plate (31) is retracted by removing the pin (35) so that its end is flush with the rear upright plate. At this time, the pin hole (3231) on the hook seat (32) is concentric with the pin hole b (312) on the ear plate (31).

2. The retractable enhanced rear traction hook device according to claim 1, characterized in that: The hook seat (32) comprises a bottom plate (321), a baffle plate (322) and a partition vertical plate (323). The number of the partition vertical plates (323) on each bottom plate (321) is set to three, and two groups of guide grooves are formed between the three partition vertical plates (323). Two ear plates (31) are correspondingly installed in the two groups of guide grooves, and a baffle plate (322) is fixedly installed on the top of the partition vertical plate (323) to prevent the ear plate (31) from falling out during the extension and retraction process. The partition vertical plate (323) has a guiding and fixing function.

3. A retractable enhanced rear traction hook device according to claim 2, characterized in that: Each group of the ear plates (31) is connected into a whole by a connecting handle (33). The connecting handle (33) includes a flange (331) and a mounting hole (332) is provided on the flange (331). Two second threaded holes (313) are provided on the side of the ear plate (31). First bolts (36) are installed in the two second threaded holes (313) for installing the connecting handle (33). The connecting handle (33) connects the two ear plates (31) in parallel so that the plurality of ear plates (31) can be extended and retracted synchronously.

4. The retractable enhanced rear traction hook device according to claim 2, characterized in that: The hook seat (32) is connected and fixed to the leg overlap block (21), the reinforcing rib plate (22), the front vertical plate (23), the middle vertical plate (24), and the rear vertical plate (25) at the bottom of the rear fixed leg (2) by welding.

5. The retractable enhanced rear traction hook device according to claim 2, characterized in that: The bottom plate (321) is provided with a plurality of first threaded holes (261), and second bolts (262) are arranged in the first threaded holes (261). The bottom of the bottom plate (321) is connected to a fixing plate (26) via the second bolts (262), and the fixing plate (26) is provided with a through hole, and the second bolts (262) pass through the through hole to mount the combined structure of the hook seat (32) and the fixing plate (26) on the rear fixing leg (2).

6. The retractable enhanced rear traction hook device according to claim 1, characterized in that: The cross-sectional shape of the ear plate (31) is set to be a rectangle, and the number of the pin shaft holes a (311) and the pin shaft holes b (312) on each ear plate (31) is set to two, and the two pin shaft holes a (311) and the two pin shaft holes b (312) are arranged in an alternating manner.

7. The retractable enhanced rear traction hook device according to claim 6, characterized in that: The distance between the two hook seats (32) can be adjusted through first threaded holes (261) at different positions on the fixing plate (26).

8. A crane, comprising the rear traction hook device according to any one of claims 1 to 7, characterized in that: It also includes a vehicle frame (1), a rear fixed leg (2) of the rear traction hook device is fixed on the vehicle frame (1), and the bottom of the rear upright plate (25) is lower than the bottom end of the vehicle frame (1).

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