Semitrailer supporting device

Abstract

The utility model discloses a semitrailer supporting device which comprises a base, a groove is formed in the upper side face of the base, a mounting plate is connected in the groove in a sliding mode, an oil cylinder is connected to the upper side of the mounting plate, a supporting plate is connected to a piston rod of the oil cylinder, an elastic supporting piece is connected between the groove and the mounting plate, and a vent hole is formed in the bottom in the groove. The lower side of the mounting plate is connected with a blocking piece, the blocking piece blocks the vent hole, piston grooves are formed in the base, each piston groove communicates with the groove through a communicating hole, a piston plate is slidably connected into each piston groove, the upper side of each piston plate is connected with a piston rod, and the piston rods are connected to the lower side of the supporting plate. The device has the advantages that when the device is used, the oil cylinder drives the supporting plate to move upwards to support the frame, then the ventilation hole is plugged through the plugging piece under the driving of the oil cylinder, the piston groove is in a sealed state, and once the oil cylinder breaks down, the piston plate can be supported through air pressure in the piston groove, so that the supporting plate can be prevented from moving downwards.

Description

Technical Field

[0001] The utility model relates to the technical field of semi-trailers, in particular to a semi-trailer supporting device. Background Art

[0002] When a semi-trailer is in operation, the rear frame is usually supported by a support device. The existing support device is mainly composed of cylinder-type support legs, which support the frame with two or four support legs to make the frame more stable and firm. However, in actual use, the cylinder of the support device is restricted by a locking member in the internal hydraulic circuit of the cylinder, so that the piston rod of the cylinder remains extended outward to maintain the supporting state during use. Once the locking member fails, the piston of the cylinder can be easily compressed rapidly under the action of the gravity of the frame, causing the frame to lose balance, tilt seriously, or even roll over.

[0003] Existing application number CN202410401760.7 describes a semi-trailer support device. The device includes a support base, a hydraulic cylinder affixed to the support base, and a support block fixedly connected to the piston rod of the hydraulic cylinder. The support base is trapezoidal in shape. A tilting rod is slidably mounted on the bottom surface of the support block. The tilting rod is located on one side of the hydraulic rod, and a tilting block is fixed to the bottom end of the tilting rod, which is parallel to one inclined surface of the trapezoid. The support block is also equipped with a limiter to restrict the sliding of the tilting rod. Although this device can prevent the vehicle frame from losing balance in the event of a problem with the hydraulic cylinder, it must be used in pairs, which increases the equipment cost. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a semi-trailer supporting device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A semi-trailer support device includes a base, a groove is provided on the upper side of the base, a mounting plate is slidably connected in the groove, an oil cylinder is connected to the upper side of the mounting plate, a support plate is connected to the piston rod of the oil cylinder, a group of elastic support members are connected between the bottom of the groove and the mounting plate, a vent is provided at the bottom of the groove, a sealing member is connected to the lower side of the mounting plate, the sealing member moves downward to seal the vent, two piston grooves are provided on the base, each piston groove is connected to the groove through a connecting hole, a piston plate is slidably connected in each piston groove, a piston rod is connected to the upper side of the piston plate, and the piston rod is connected to the lower side of the support plate.

[0007] Preferably, an extension is connected to the upper side of each piston groove, and the extension is vertically connected to the corresponding piston groove. A through hole is provided at the upper end of the sleeve, and the piston rod passes through the through hole.

[0008] Preferably, the blocking member is a sealing plug, which is connected to the bottom of the mounting plate via a vertical rod.

[0009] Preferably, the elastic support member includes a telescopic rod, the upper end of the telescopic rod is connected to the bottom of the mounting plate, the lower end of the telescopic rod is connected to the bottom of the groove, and a first spring is sleeved on the outside of the telescopic rod, and the first spring is connected between the mounting plate and the bottom of the groove.

[0010] Preferably, a ventilation groove is provided on the lower side of the base, the ventilation groove is connected to the ventilation hole, and air grooves are provided on both sides of the ventilation groove, and the air grooves are connected to the outside of the base.

[0011] Preferably, sliding grooves are provided on both sides of the groove, a snap-in block is slidably connected in each sliding groove, a second spring is connected between the snap-in block and the inner side of the sliding groove, a through hole is provided on the inner side of the sliding groove, the through hole is connected to the outer side of the base, a sliding rod is inserted in the through hole, one end of the sliding rod is connected to the corresponding snap-in block, and the other end of the sliding rod is connected to the pulling block.

[0012] The advantages of the present invention are that: when in use, the semi-trailer support device provided by the present invention drives the support plate to move upward to support the vehicle frame through the oil cylinder, and then the vent hole is blocked by the sealing member under the drive of the oil cylinder, so that the piston groove is in a sealed state. Once the oil cylinder fails, the piston plate will be supported by the air pressure in the piston groove, thereby preventing the support plate from moving downward. Compared with the existing support device, this device does not need to be used in pairs, has few usage restrictions, and has low equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the principle structure of a semi-trailer support device provided by the utility model;

[0014] Figure 2 It is a cross-sectional view from another perspective of a semi-trailer support device. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0017] like Figure 1 As shown, the utility model provides a semi-trailer support device, including a base 1, a groove 2 is provided on the upper side of the base 1, the groove 2 is a rectangular groove, a mounting plate 3 of a corresponding shape is slidably connected in the groove 2, an oil cylinder 4 is connected to the upper side of the mounting plate 3, and a support plate 5 is connected to the piston rod of the oil cylinder 4. The support plate 5 is driven upward by the oil cylinder 4 to support the frame.

[0018] A group of elastic support members 6 are connected between the bottom of the groove 2 and the mounting plate 3. The elastic support members 6 include a telescopic rod 6.1. The telescopic rod 6.1 is an existing structure. The upper end of the telescopic rod 6.1 is connected to the bottom of the mounting plate 3, and the lower end of the telescopic rod 6.1 is connected to the bottom of the groove 2. A first spring 6.2 is sleeved on the outside of the telescopic rod 6.1. The first spring 6.2 is connected between the mounting plate 3 and the bottom of the groove 2. When the oil cylinder 4 drives the support plate 5 to move upward to support the frame, the mounting plate 3 will move downward in the groove 2, causing the telescopic rod 6.1 to contract and compress the first spring 6.2.

[0019] Two piston grooves 9 are provided on the base 1, each piston groove 9 is connected to the groove 2 through a connecting hole 10, and a piston plate 11 is slidably connected in each piston groove 9, and a piston rod 12 is connected to the upper side of the piston plate 11, and the piston rod 12 is connected to the lower side of the support plate 5. An extension tube 9.1 is connected to the upper side of each piston groove 9, and the extension tube 9.1 is vertically connected to the corresponding piston groove 9. A through hole is provided at the upper end of the extension tube 9.1, and the piston rod 12 passes through the through hole. The upper end of the piston rod 12 is connected to the bottom of the mounting plate 3. When the oil cylinder 4 drives the support plate 5 to move upward, the support plate 5 drives the piston plate 11 to move upward in the piston groove 9 through the piston rod 12.

[0020] A vent hole 7 is provided at the bottom of the groove 2, and a vent groove 1.1 is provided on the lower side of the base 1, the vent groove 1.1 is connected to the vent hole 7, and air grooves 1.2 are provided on both sides of the vent groove 1.1, and the air grooves 1.2 are connected to the outside of the base 1. When the piston plate 11 moves upward in the piston groove 9, the piston groove 9 will draw air from the outside, and the air will enter the piston groove 9 from the air groove 1.2, the vent groove 1.1, the vent hole 7, the groove 2 and the connecting hole 10 in sequence, so that the piston groove 9 is filled with gas.

[0021] A blocking piece 8 is connected to the lower side of the mounting plate 3. The blocking piece 8 is a sealing plug, which is connected to the bottom of the mounting plate 3 through a vertical rod 8.1. When the telescopic rod 6.1 is fully retracted, the blocking piece 8 will block the vent 7, so that a sealed cavity is formed between the groove 2, the communicating hole 10 and the piston groove 9. When the support plate 5 moves downward, the atmospheric pressure in the piston groove 9 will prevent the piston plate 11 from moving downward, thereby preventing the support plate 5 from continuing to descend.

[0022] There are sliding grooves 2.1 on both sides of the groove 2, and a snap-on block 2.2 is slidably connected in each sliding groove 2.1. One side of the snap-on block 2.2 is a slope, and its slope faces the mounting plate 3. When the mounting plate 3 moves downward, it will first contact the slope of the snap-on block 2.2, squeezing the snap-on block 2.2 into the sliding groove 2.1. A second spring 2.3 is connected between the snap-on block 2.2 and the inner side of the sliding groove 2.1. Once the mounting plate 3 moves to the bottom of the snap-on block 2.2, the snap-on block 2.2 pops out under the elastic force of the second spring 2.3, thereby clamping the mounting plate 3 and preventing the mounting plate 3 from moving upward, thereby preventing the space between the mounting plate 3 and the bottom of the groove 2 from becoming larger, allowing the air in the piston groove 9 to enter the groove 2, reducing the air pressure in the piston groove 9, and further preventing the piston plate 11 from moving downward.

[0023] like Figure 2 As shown, a through hole is provided on the inner side of the sliding groove 2.1, which is connected to the outer side of the base 1, and a sliding rod 2.4 is inserted into the through hole. One end of the sliding rod 2.4 is connected to the corresponding clamping block 2.2, and the other end of the sliding rod 2.4 is connected to the pulling block 2.5. The sliding rod 2.4 is pulled by the pulling block 2.5 to retract the clamping block 2.2 into the sliding groove 2.1, so that the mounting plate 3 moves upward under the elastic force of the first spring 6.2, so that the sealing member 8 is disengaged from the vent 7, and the air in the piston groove 9 is discharged through the vent 7, thereby moving the support plate 5 downward, causing the frame to lose the support of the support device, thereby removing the device.

[0024] When the device is in use, the base 1 is first placed under the frame, and then the oil cylinder 4 is started to drive the support plate 5 to move upward to support the frame. Then, the mounting plate 3 is moved downward under the drive of the oil cylinder 4, and the mounting plate 3 drives the blocking member 8 to move downward to block the vent hole 7, so that the piston groove 9 is in a sealed state. Once the oil cylinder 4 fails, the support plate 5 will move downward, but the air pressure in the piston groove 9 will support the piston plate 11, and then support the support plate 5, which can prevent the support 5 from moving downward, thereby being able to continue to support the frame, and can prevent the frame from tilting or even rolling over. Moreover, compared with existing support devices, the device does not need to be used in pairs, has fewer usage restrictions, and has low equipment cost.

[0025] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A semi-trailer support device, characterized in that: The invention comprises a base (1), a groove (2) is provided on the upper side of the base (1), a mounting plate (3) is slidably connected in the groove (2), an oil cylinder (4) is connected on the upper side of the mounting plate (3), a support plate (5) is connected to the piston rod of the oil cylinder (4), a group of elastic support members (6) are connected between the bottom of the groove (2) and the mounting plate (3), a vent hole (7) is provided at the bottom of the groove (2), a blocking member (8) is connected on the lower side of the mounting plate (3), and the blocking member (8) moves downward to block the vent hole (7), two piston grooves (9) are provided on the base (1), each piston groove (9) is connected to the groove (2) through a connecting hole (10), a piston plate (11) is slidably connected in each piston groove (9), a piston rod (12) is connected on the upper side of the piston plate (11), and the piston rod (12) is connected to the lower side of the support plate (5).

2. A semi-trailer support device according to claim 1, characterized in that: An extension tube (9.1) is connected to the upper side of each piston groove (9), and the extension tube (9.1) is vertically connected to the corresponding piston groove (9). A through hole is provided at the upper end of the extension tube (9.1), and the piston rod (12) passes through the through hole.

3. The semi-trailer support device according to claim 1, characterized in that: The blocking member (8) is a sealing plug, which is connected to the bottom of the mounting plate (3) via a vertical rod (8.1).

4. The semi-trailer support device according to claim 1, characterized in that: The elastic support member (6) comprises a telescopic rod (6.1), the upper end of the telescopic rod (6.1) is connected to the bottom of the mounting plate (3), the lower end of the telescopic rod (6.1) is connected to the bottom of the groove (2), a first spring (6.2) is sleeved on the outside of the telescopic rod (6.1), and the first spring (6.2) is connected between the mounting plate (3) and the bottom of the groove (2).

5. The semi-trailer support device according to claim 1, characterized in that: A ventilation groove (1.1) is provided on the lower side of the base (1), the ventilation groove (1.1) being connected to the ventilation hole (7), and air grooves (1.2) are provided on both sides of the ventilation groove (1.1), the air grooves (1.2) being connected to the outside of the base (1).

6. The semi-trailer support device according to claim 1, characterized in that: Sliding grooves (2.1) are provided on both sides of the groove (2), a snap-in block (2.2) is slidably connected in each sliding groove (2.1), a second spring (2.3) is connected between the snap-in block (2.2) and the inner side of the sliding groove (2.1), a through hole is provided on the inner side of the sliding groove (2.1), the through hole is connected to the outer side of the base (1), a sliding rod (2.4) is inserted into the through hole, one end of the sliding rod (2.4) is connected to the corresponding snap-in block (2.2), and the other end of the sliding rod (2.4) is connected to the pulling block (2.5).

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