Hydraulic jack

Abstract

The utility model belongs to the technical field of jacks, and particularly relates to a hydraulic jack which comprises a hydraulic jack body, the top end of the hydraulic jack body is fixedly connected with a supporting plate, the bottom end of the supporting plate is fixedly connected with three evenly-distributed inner threaded rods, and the outer walls of the inner threaded rods are in threaded connection with inner threaded sleeve rods. The internal thread sleeve rod is rotationally connected with the hydraulic jack body, a ratchet gear is fixedly connected to the outer wall of the internal thread sleeve rod, limiting teeth are meshed with one side of the ratchet gear, a torsional spring shaft sleeve is fixedly connected to one side of the limiting teeth, and a connecting plate is fixedly connected to one side of the torsional spring shaft sleeve. The bottom end of the connecting plate is fixedly connected with a spring telescopic rod; the inner threaded rod and the inner threaded sleeve rod can automatically extend along with movement of the supporting plate, and the ratchet gear and the limiting teeth are matched for limiting the inner threaded sleeve rod, so that the inner threaded rod and the inner threaded sleeve rod can automatically support the supporting plate when the hydraulic jack body structure is damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of jacks, and in particular relates to a hydraulic jack. Background Art

[0002] The hydraulic jack lifts the telescopic rod by adjusting the piston to pump hydraulic oil to lift the heavy object. During use, the pumping pipe and the sealing structure bear the pressure applied to the hydraulic oil by the heavy object. After long-term use, the pipe and the sealing structure may be damaged, resulting in hydraulic oil leakage, which will cause the telescopic rod of the jack to contract. The rapid fall of the heavy object will cause injury to the people under the heavy object. Some jacks will be equipped with a locking mechanism to limit the retraction of the jack's telescopic rod, but additional operation is required from the personnel, and the jack cannot force the personnel to lock the telescopic rod. Some people do not perform the locking operation during use, and the jack cannot play the due protective effect when it is damaged. Utility Model Content

[0003] The utility model provides a hydraulic jack, which has the characteristic of improving the safety of the hydraulic jack body when in use without requiring workers to perform additional protective operations.

[0004] The utility model provides the following technical solution: a hydraulic jack, comprising a hydraulic jack body, the top of the hydraulic jack body is fixedly connected to a support plate, the bottom end of the support plate is fixedly connected to three evenly distributed threaded inner rods, the outer walls of the threaded inner rods are threadedly connected to internally threaded sleeve rods, the internally threaded sleeve rods are rotatably connected to the hydraulic jack body, the outer wall of the internally threaded sleeve rods is fixedly connected to a ratchet gear, one side of the ratchet gear is engaged with limiting teeth, one side of the limiting teeth is fixedly connected to a torsion spring sleeve, one side of the torsion spring sleeve is fixedly connected to a connecting plate, and the bottom end of the connecting plate is fixedly connected to a spring telescopic rod.

[0005] Wherein, the bottom end of the internal threaded sleeve is rotatably connected to a rotating base, and the rotating base is fixedly connected to the top end of the bottom plate of the hydraulic jack body.

[0006] Wherein, a guide support rod is inserted into the torsion spring sleeve, and the guide support rod is fixedly connected to the top of the bottom plate of the hydraulic jack body.

[0007] Wherein, an extension connecting rod is fixedly connected to the top end of the connecting plate, and the extension connecting rod is located on a side of the torsion spring sleeve away from the limiting teeth.

[0008] Wherein, the top ends of the three extending connecting rods are fixedly connected with connecting ring plates.

[0009] Wherein, a protective sleeve is provided on the outer side of the internal threaded sleeve rod, the ratchet gear and the connecting plate, and the protective sleeve is fixedly connected to the top of the bottom plate of the hydraulic jack body.

[0010] The extension and contraction amount of the spring telescopic rod is greater than the thickness of the limiting teeth, and the distance between the bottom end of the torsion spring sleeve and the bottom plate of the hydraulic jack body is greater than the thickness of the limiting teeth.

[0011] The beneficial effects of the present invention are as follows: the threaded inner rod and the internally threaded sleeve rod can automatically extend following the movement of the support plate, and cooperate with the ratchet gear and the limiting teeth to limit the position of the internally threaded sleeve rod, so that the threaded inner rod and the internally threaded sleeve rod can automatically support the support plate when the hydraulic jack body structure is damaged, and further support the heavy object, thereby preventing the heavy object from falling when the hydraulic jack body is damaged. The safety of the hydraulic jack body when in use is improved without the need for staff to perform additional protective operations.

[0012] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0015] Figure 3 This is a schematic structural diagram of the internal thread sleeve and ratchet gear in the present invention;

[0016] Figure 4 This is a schematic diagram of the downward movement of the limit teeth and the torsion spring sleeve in the utility model.

[0017] In the figure: 1. Hydraulic jack body; 11. Support plate; 2. Threaded inner rod; 21. Internally threaded sleeve rod; 22. Rotating base; 3. Ratchet gear; 31. Limit teeth; 32. Torsion spring sleeve; 33. Guide support rod; 4. Connecting plate; 41. Spring telescopic rod; 42. Extended connecting rod; 43. Connecting ring plate; 5. Protective cover. DETAILED DESCRIPTION

[0018] See also Figure 1-Figure 4 The utility model provides the following technical solutions: a hydraulic jack, including a hydraulic jack body 1, a support plate 11 is fixedly connected to the top of the hydraulic jack body 1, three evenly distributed threaded inner rods 2 are fixedly connected to the bottom end of the support plate 11, the outer wall of the threaded inner rod 2 is threadedly connected to an internal threaded sleeve rod 21, the internal threaded sleeve rod 21 is rotatably connected to the hydraulic jack body 1, a ratchet gear 3 is fixedly connected to the outer wall of the internal threaded sleeve rod 21, one side of the ratchet gear 3 is engaged with a limiting tooth 31, one side of the limiting tooth 31 is fixedly connected to a torsion spring sleeve 32, one side of the torsion spring sleeve 32 is fixedly connected to a connecting plate 4, and the bottom end of the connecting plate 4 is fixedly connected to a spring telescopic rod 41.

[0019] In this embodiment: the staff installs the hydraulic jack body 1 under the weight, and adjusts the telescopic rod of the hydraulic jack body 1 by the piston to gradually extend upward to lift the weight. During the upward movement of the support plate 11, the threaded inner rod 2 automatically follows the support plate 11 to move upward and extends outward from the internal threaded sleeve rod 21. The internal threaded sleeve rod 21 rotates under the action of the threaded inner rod 2 and the thread, and the ratchet gear 3 rotates with the internal threaded sleeve rod 21. When the hydraulic jack body 1 explodes or other structural damages cause the telescopic rod of the hydraulic jack body 1 to be unable to support the support plate 11, the pressure of the support plate 11 acts on the threaded inner rod 2, and the rotation of the internal threaded sleeve rod 21 is limited by the ratchet gear 3 and the limiting teeth 31, so that the threaded inner rod 2 cannot be retracted in the internal threaded sleeve rod 21, so that the threaded inner rod 2 and the internal threaded sleeve rod 21 can be in the hydraulic jack. When the structure of the main body 1 is damaged, it will automatically support the support plate 11, further supporting the heavy object, preventing the heavy object from falling when the hydraulic jack body 1 is damaged. The safety of the hydraulic jack body 1 during use can be improved without the staff taking additional protective measures. When the support plate 11 needs to be retracted, the user presses the extended connecting rod 42 to drive the connecting plate 4 and the telescopic rod of the spring telescopic rod 41 to move downward, so as to drive the limiting teeth 31 and the torsion spring sleeve 32 to move downward, releasing the restriction on the ratchet gear 3, and the threaded inner rod 2 moves downward with the support plate 11. The spring telescopic rod 41 can automatically reset after being pressed down and contracted by the connecting plate 4. When operating the adjusting piston of the hydraulic jack body 1, the person's foot keeps stepping on the connecting ring plate 43. The spring telescopic rod 41 can serve as a protective insurance structure to prevent the support plate 11 from falling a large distance due to accidental touch.

[0020] The bottom end of the internal threaded sleeve 21 is rotatably connected to a rotating base 22, and the rotating base 22 is fixedly connected to the top of the bottom plate of the hydraulic jack body 1; by setting the rotating base 22, the relative rotation of the internal threaded sleeve 21 and the bottom plate of the hydraulic jack body 1 can be achieved, and the internal threaded sleeve 21 can be positioned at the same time.

[0021] A guide support rod 33 is inserted into the torsion spring sleeve 32, and the guide support rod 33 is fixedly connected to the top of the bottom plate of the hydraulic jack body 1; by setting the guide support rod 33, the torsion spring sleeve 32 can be positioned to avoid position displacement of the torsion spring sleeve 32 during movement.

[0022] An extension connecting rod 42 is fixedly connected to the top of the connecting plate 4, and the extension connecting rod 42 is located on the side of the torsion spring sleeve 32 away from the limiting teeth 31; by setting the extension connecting rod 42, the protective sleeve 5 can be exposed, so that personnel can adjust the position of the connecting plate 4 to adjust the position of the limiting teeth 31 and the torsion spring sleeve 32.

[0023] The top ends of the three extending connecting rods 42 are fixedly connected with connecting ring plates 43 . The three extending connecting rods 42 can be connected by providing the connecting ring plates 43 , so that the staff can adjust the three extending connecting rods 42 simultaneously.

[0024] A protective sleeve 5 is provided on the outside of the internally threaded sleeve rod 21, the ratchet gear 3 and the connecting plate 4, and the protective sleeve 5 is fixedly connected to the top of the bottom plate of the hydraulic jack body 1; by providing the protective sleeve 5, the internally threaded sleeve rod 21, the ratchet gear 3 and the connecting plate 4 can be protected to prevent the operation of each component from being obstructed by external objects.

[0025] The extension and contraction amount of the spring telescopic rod 41 is greater than the thickness of the limiting tooth 31, and the distance between the bottom end of the torsion spring sleeve 32 and the bottom plate of the hydraulic jack body 1 is greater than the thickness of the limiting tooth 31; the thickness of the limiting tooth 31 is such that the limiting tooth 31 and the torsion spring sleeve 32 can move downward smoothly under the action of the connecting plate 4 to disengage from the ratchet gear 3.

[0026] The working principle and use process of the utility model are as follows: the staff installs the hydraulic jack body 1 under the weight, and adjusts the telescopic rod of the hydraulic jack body 1 to gradually extend upward to lift the weight by the piston. In the process of the support plate 11 moving upward, the threaded inner rod 2 automatically follows the support plate 11 to move upward and extends outward from the internal threaded sleeve rod 21. The internal threaded sleeve rod 21 rotates under the action of the threaded inner rod 2 and the thread, and the ratchet gear 3 rotates with the internal threaded sleeve rod 21. When the hydraulic jack body 1 explodes or other structural damages cause the telescopic rod of the hydraulic jack body 1 to be unable to support the support plate 11, the pressure of the support plate 11 acts on the threaded inner rod On the rod 2, the rotation of the internal threaded sleeve rod 21 is limited by the ratchet gear 3 and the limiting teeth 31, so that the threaded internal rod 2 cannot be retracted in the internal threaded sleeve rod 21, so that the threaded internal rod 2 and the internal threaded sleeve rod 21 can support the support plate 11 by themselves when the structure of the hydraulic jack body 1 is damaged, and further support the heavy object to prevent the heavy object from falling when the hydraulic jack body 1 is damaged. When the support plate 11 needs to be retracted, the person's feet keep stepping on the connecting ring plate 43, pressing the extended connecting rod 42 to drive the connecting plate 4 and the telescopic rod of the spring telescopic rod 41 to move downward, so as to drive the limiting teeth 31 and the torsion spring sleeve 32 to move downward, thereby releasing the restriction on the ratchet gear 3.

Claims

1. A hydraulic jack, comprising a hydraulic jack body (1), characterized in that: The top of the hydraulic jack body (1) is fixedly connected to a support plate (11), the bottom of the support plate (11) is fixedly connected to three evenly distributed threaded inner rods (2), the outer wall of the threaded inner rod (2) is threadedly connected to an internal threaded sleeve rod (21), the internal threaded sleeve rod (21) is rotatably connected to the hydraulic jack body (1), the outer wall of the internal threaded sleeve rod (21) is fixedly connected to a ratchet gear (3), one side of the ratchet gear (3) is engaged with a limiting tooth (31), one side of the limiting tooth (31) is fixedly connected to a torsion spring sleeve (32), one side of the torsion spring sleeve (32) is fixedly connected to a connecting plate (4), and the bottom end of the connecting plate (4) is fixedly connected to a spring telescopic rod (41).

2. A hydraulic jack according to claim 1, characterized in that: The bottom end of the internal threaded sleeve rod (21) is rotatably connected to a rotating base (22), and the rotating base (22) is fixedly connected to the top end of the bottom plate of the hydraulic jack body (1).

3. The hydraulic jack according to claim 1, characterized in that: A guide support rod (33) is inserted into the torsion spring sleeve (32), and the guide support rod (33) is fixedly connected to the top end of the bottom plate of the hydraulic jack body (1).

4. The hydraulic jack according to claim 1, characterized in that: An extension connecting rod (42) is fixedly connected to the top end of the connecting plate (4), and the extension connecting rod (42) is located on a side of the torsion spring sleeve (32) away from the limiting teeth (31).

5. A hydraulic jack according to claim 4, characterized in that: The top ends of the three extending connecting rods (42) are fixedly connected with connecting ring plates (43).

6. The hydraulic jack according to claim 1, characterized in that: A protective sleeve (5) is provided on the outside of the internally threaded sleeve rod (21), the ratchet gear (3) and the connecting plate (4), and the protective sleeve (5) is fixedly connected to the top end of the bottom plate of the hydraulic jack body (1).

7. The hydraulic jack according to claim 1, characterized in that: The expansion and contraction amount of the spring telescopic rod (41) is greater than the thickness of the limiting teeth (31), and the distance between the bottom end of the torsion spring sleeve (32) and the bottom plate of the hydraulic jack body (1) is greater than the thickness of the limiting teeth (31).

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