CN210559093U

CN210559093U - Jack for easily-damaged part

Info

Publication number: CN210559093U
Application number: CN201921337728.8U
Authority: CN
Inventors: 徐桂芬
Original assignee: Jiaxing Yuexin Machinery Co Ltd
Current assignee: Jiaxing Yuexin Machinery Co ltd
Priority date: 2019-08-17
Filing date: 2019-08-17
Publication date: 2020-05-19
Anticipated expiration: 2029-08-17

Abstract

The utility model belongs to the technical field of jacks, in particular to a jack used for vulnerable parts, which comprises a base B, lower supporting arms, an upper supporting arm, a hinging block A, a screw rod B and the like, wherein two lower supporting arms which are symmetrically distributed are respectively hinged with the two upper supporting arms, and one ends of the two lower supporting arms which are not hinged with the corresponding upper supporting arms are hinged on the base B; the utility model discloses it must support the easily damaged position's that easily wears fatigue deformation to automobile body or equipment that traditional scissor jack has been avoidd effectively because of the position that needs adjusted the cushion repeatedly, adjusting the in-process to the cushion, need not the part of automobile body or equipment and carry out reciprocal ascending and descending in turn, and the easily damaged position that keeps automobile body or equipment throughout does not take place local motion, avoids automobile body or equipment because of easily damaged position part is reciprocal to go up and down and the automobile body or the equipment that lead to is impaired.

Description

Jack for easily-damaged part

Technical Field

The utility model belongs to the technical field of the jack, especially, relate to a jack that vulnerable part used.

Background

The scissor jack is a kind of hoisting equipment, mainly used for jacking and supporting cars with small tonnage. Common specifications include 1T, 1.5T, 2T, 3T and the like. The scissor jack is also called a support jack, is convenient and quick to use, and is a vehicle-mounted product in various domestic automobile factories. The device consists of an upper support arm and a lower support arm which are made of metal plates, and the working principles are different. The scissor jack is suitable for mechanical maintenance, particularly for the maintenance of cars, and is stable, reliable and high in bearing capacity. However, if the scissor jack is used for supporting the vulnerable part of the automobile or the equipment, the vulnerable part of the automobile or the equipment is easily damaged; to avoid such damage, softer support pads are often placed on the support plate that contacts the vulnerable portion of the supported vehicle or equipment to avoid damage to the vehicle body or equipment by the jack; the situation is often encountered in the process of placing the supporting pad, namely the supporting pad placed on the supporting plate of the jack can deflect or misplace when interacting with the supporting part of the automobile or equipment, at the moment, the lead screw needs to be shaken again to lower the supporting plate to place the supporting pad again, and then the lead screw is shaken to support the automobile body or the equipment; so reciprocal position until supporting pad is suitable, operating efficiency is lower. In addition, the traditional scissor jack supports a vehicle body or equipment in a single point mode, stability is relatively poor, and if an automobile forgets to pull a hand brake, the jack is prone to toppling due to movement of the automobile under the action of external force, so that operation safety of the jack is reduced. In view of the above-mentioned disadvantages of the conventional scissor jack, it is necessary to design a jack suitable for supporting a vulnerable portion of a vehicle body or equipment. The utility model relates to a jack that vulnerable part used solves above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned defect among the prior art, the utility model discloses a jack that vulnerable part used, it adopts following technical scheme to realize.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the utility model is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the equipment or element indicated must have a specific position, be constructed or operated in a specific position, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

A jack that vulnerable part used which characterized in that: the device comprises a base B, lower supporting arms, upper supporting arms, a hinge block A, a screw rod A, a sliding sleeve A, a hinge block B, a balance square rod, a supporting plate, a reset spring, a swing plate A, a swing plate B, a sliding sleeve B, a swing plate C, a screw rod B, a nut and a telescopic rod, wherein the two lower supporting arms which are symmetrically distributed are respectively hinged with the two upper supporting arms, and one ends of the two lower supporting arms, which are not hinged with the corresponding upper supporting arms, are hinged on the base B; the two lower supporting arms and the two upper supporting arms are positioned on the same vertical plane; each lower supporting arm is rotatably matched with a hinge block A on a hinge pin of the corresponding upper supporting arm; the threaded holes on the two hinge blocks A are respectively in threaded fit with the external thread A and the external thread B on the screw rod A, and the central axis of the screw rod A which is driven to rotate by hand is vertically intersected with the central axis of the hinge pin of the lower support arm and the corresponding upper support arm; the two groups of lower supporting arms and upper supporting arms which are hinged with each other are oppositely bent around corresponding hinge pins respectively; the upper ends of the two upper supporting arms are respectively hinged with the two hinge blocks B, and the central axis of the hinge pin of each upper supporting arm is perpendicular to the central axis of the screw rod A; the two hinge blocks B are symmetrically hinged to two sides of the sliding sleeve A at the same time, and the hinge blocks B and the hinge pins of the sliding sleeve A vertically bisect the hinge blocks B and the hinge pins of the corresponding upper supporting arms.

A balance square rod slides in the sliding sleeve A along the direction vertical to the hinge pin hinged by the hinge block B and the sliding sleeve A; two ends of the balance square rod are respectively hinged with the centers of the lower end faces of the two support plates, and a hinge pin for hinging the balance square rod and the two support plates is parallel to a hinge pin for hinging the hinge block B and the sliding sleeve A; two reset springs for resetting the sliding sleeve A are symmetrically arranged on the balance square rod; the swing plate A and the swing plate B are hinged to the middle of the screw rod A in a crossed manner, and the middle of the screw rod A slides in the sliding groove A on the swing plate A and the sliding groove B on the swing plate B relatively at the same time; the upper ends of the swing plate A and the swing plate B are respectively hinged with two ends of the balance square rod, and the central axes of the hinge pins respectively hinged with the balance square rod by the swing plate A and the swing plate B are respectively superposed on the central axes of the hinge pins hinged with the corresponding support plates at two ends of the balance square rod; the lower ends of the swing plate A and the swing plate B are respectively hinged with a sliding sleeve B, and hinge pins of the swing plate A and the swing plate B which are respectively hinged with the two sliding sleeves B are parallel to the screw rod A; the screw B slides in the two sliding sleeves B along the direction vertical to the screw A; two ends of a swing plate C of which the middle part is in rotary fit with the middle part of the lead screw A are respectively connected with two ends of the lead screw B through telescopic rods, and the swing plate C is parallel to the lead screw B; two nuts are matched on the screw rod B in a threaded manner, and the two sliding sleeves B are positioned between the two nuts.

As a further improvement of the technology, the length of the upper support arm is equal to that of the lower support arm, so that after the jack is recovered after use, the inclination of the upper support arm and the inclination of the lower support arm relative to the ground after the upper support arm and the lower support arm are bent relative to each other are minimized, the occupied space is reduced, and the storage and the keeping of the jack are facilitated; on the other hand, when the jack is used for supporting the vehicle body or equipment, the supporting plate of the jack can be lifted to a higher height as much as possible, and the vehicle or equipment with a higher chassis is effectively supported. The length of the swing plate A is equal to that of the swing plate B, so that when the jack effectively supports a vehicle body or equipment, the two sliding sleeves B are symmetrically distributed on the screw rod B, and acting forces of the two sliding sleeves B borne by the screw rod B are balanced with each other.

As a further improvement of the technology, the lower end of the base B is provided with the base A, and the horizontal supporting area of the base A is larger than that of the base B. The larger support area of base A makes whole jack stability when supporting automobile body or equipment better.

As a further improvement of the technology, one end of the screw rod A is provided with a limiting block A, and the other end of the screw rod A is provided with a torsion ring. The limiting block A prevents the jack from tripping with the corresponding hinging block A due to insufficient length of the lead screw A in the recovery process after use. The torsion ring drives the screw rod A to rotate through being matched with a special tool.

As a further improvement of the technology, the optimization scheme that the two ends of the balance square rod are respectively hinged with the centers of the lower end faces of the two support plates is that the centers of the lower end faces of the support plates are provided with the support lugs A, and the two support lugs A are respectively hinged with the two ends of the balance square rod. The existence of the support lug A enables the support plate to swing to a larger extent relative to the balance square rod, and the relative swinging interference between the support plate and the balance square rod is avoided.

As the further improvement of the technology, the upper end face of the supporting plate is provided with a positioning groove matched with a vehicle body or an equipment supporting part, and the positioning groove is matched with the vehicle body or the equipment supporting part, so that the supported vehicle body or equipment is difficult to slide relative to the supporting plate along the horizontal direction parallel to the vertical surface where the upper supporting arm and the lower supporting arm are located, the stability of the supported vehicle body or equipment is further ensured, and the safety and the effectiveness of the jack for supporting the vehicle body or the equipment are further improved.

As a further improvement of the technology, the balance square rod is symmetrically provided with two compression spring plates which are distributed on two sides of the sliding sleeve A; the two return springs are nested on the balance square rod, and the two return springs are distributed on two sides of the sliding sleeve A; the two return springs are respectively positioned between the sliding sleeve A and the corresponding pressure spring plate; one end of the reset spring is connected with the end face of the slide bar A, and the other end of the reset spring is connected with the corresponding compression spring plate.

As a further improvement of the technology, the lower end of the swing plate A is provided with a notch A, and the upper end is provided with a notch C; the lower end of the swing plate B is provided with a notch B, and the lower end of the swing plate B is provided with a notch D; a swinging plate B which is hinged with the swinging plate A in a crossed manner relatively swings in the notch A on the swinging plate A; the swing plate C rotates in the notch B on the swing plate B relative to the screw rod A; two ends of the balance square rod are respectively hinged in the notch C at the upper end of the swing plate A and the notch D at the upper end of the swing plate B. The existence of the notch A and the notch B enables the swing plate A and the swing plate B to be in the same vertical plane, the acting forces of the swing plate A and the swing plate B on the middle part of the screw rod A are balanced mutually, and the deformation of the screw rod A caused by the unbalanced action of the swing plate A and the swing plate B on the screw rod A is reduced; meanwhile, the lower ends of the swing plate A and the swing plate B respectively generate zero torque around the central axis of the screw rod B to the screw rod B through the corresponding sliding sleeves B, so that the torsion of the screw rod B caused by the torque generated by the swing plate A and the swing plate B not on the same vertical plane is avoided; the existence of incision C and incision D makes the upper end of pendulum board A and pendulum board B respectively to the balanced atress in the both ends of the hinge pin articulated with balanced square bar, avoids hinge pin unilateral atress to lead to warping.

As a further improvement of the technology, the lower ends of the swing plate A and the swing plate B are respectively hinged with a support lug B arranged at the upper end of the two sliding sleeves B; two limiting blocks B are symmetrically arranged at two ends of the screw rod B, and the two limiting blocks B are respectively connected with two ends of the swing plate C through corresponding telescopic rods.

As a further improvement of the present technology, the screw direction of the external thread a on the screw a is opposite to the screw direction of the external thread B, so that when the screw a rotates, the two hinge blocks a move in opposite directions or back to back along the axial direction of the screw.

Compared with the traditional scissor jack, the two support plates in the utility model, which are separated from each other by a certain distance, form two support points when supporting the vehicle body or the vulnerable part of the equipment; for the single strong point that forms when traditional scissor jack supports automobile body or equipment, the utility model discloses two backup pads are more firm to the support of automobile body or equipment, receive when the automobile body or equipment along perpendicular to under bracing arm and the effort of going up the vertical face in support arm place, the difficult emergence lodging of jack for jack is firm effective to the support of automobile body or equipment. When the utility model is used for supporting the easily damaged part of the vehicle body or the equipment, in order to reduce or avoid the extrusion deformation damage of the easily damaged part of the vehicle body or the equipment caused by the hard contact of the two supporting plates, the upper ends of the two supporting plates are respectively padded with the elastic pads to reduce or eliminate the damage of the supporting plates to the vehicle body or the equipment; for traditional scissor jack cushion put the cushion when supporting automobile body or the vulnerable part of equipment, the utility model discloses accomplish the support back to automobile body or the vulnerable part of equipment, if the position of the cushion on one of them backup pad is improper or incline a bit, can not take place the corresponding sliding sleeve B matched with nut of the backup pad of incline through locking and cushion, and shake lead screw A backward and make lead screw A move vertically downwards, make the cushion do not take place under the circumstances that the inclined backup pad still supported automobile body or equipment through the cushion, the backup pad that the cushion place that takes place the incline or the improper cushion in position breaks away from the strong point on automobile body or equipment gradually under corresponding balance staff A or balance staff B drive; then, the screw rod A is positively shaken after the position of the elastic pad is adjusted, so that the screw rod A drives the support plates with the adjusted positions to move upwards through a series of transmission and supports the vehicle body or the equipment again, and finally the two support plates simultaneously form effective support for the vulnerable parts of the vehicle body or the equipment; when the traditional scissor jack is used for adjusting the elastic cushion, the vehicle body or equipment must be repeatedly supported or unsupported to adjust the position of the elastic cushion, and in the process of adjusting the elastic cushion, the vehicle body or equipment is repeatedly lifted and falls down, so that for evacuation or equipment with large mass, the reciprocating local lifting easily causes deformation and fatigue damage of vulnerable local parts of the vehicle body or equipment, and the vulnerable local parts of the vehicle body or equipment are damaged; the utility model discloses avoided traditional scissor jack effectively because of needing to adjust the position of cushion repeatedly and to the automobile body or the easy damage position that equipment must support fatigue deformation of repeated action, in adjusting the cushion, need not the automobile body or the local reciprocal lift of equipment of going on, and keep the easy damage position of automobile body or equipment not to take place local motion all the time, avoid automobile body or equipment damage because of easy damage position local reciprocal lift leads to; the utility model discloses simple structure has better result of use.

Drawings

Fig. 1 is an overall schematic view of the jack.

Fig. 2 is an overall sectional view of the jack.

Fig. 3 is a schematic sectional view of the upper support arm, the hinge block a, the lower support arm and the screw a.

Fig. 4 is a schematic cross-sectional view of the support plate, the support lug a, the balance square rod, the swing plate a, the swing plate B, the sliding sleeve B, the screw rod B, the telescopic rod and the swing plate C.

Fig. 5 is a schematic sectional view of the upper support arm, the hinge block B, the sliding sleeve a, the balance square rod, the support lug a, the swing plate a and the swing plate B.

Fig. 6 is a schematic diagram of the matching of a swing plate A, a swing plate B, a sliding sleeve B, a screw rod B, a limiting block B, a telescopic rod and a swing plate C.

Fig. 7 is a schematic diagram of the matching of the support plate, the support lug a, the balance square rod, the sliding sleeve a, the hinge block B, the return spring and the compression spring plate.

Fig. 8 is a schematic view of the support plate and the support lug a.

Fig. 9 is a schematic diagram of the combination of the base a, the base B, the lower support arm, the upper support arm, the hinge block a and the screw a.

Fig. 10 is a schematic view of a hinge block a.

Fig. 11 is a schematic view of the swing plate a and the swing plate B.

The name of the winning symbol: 1. a base A; 2. a base B; 3. a lower support arm; 4. an upper support arm; 5. a hinged block A; 6. a screw mandrel A; 7. an external thread A; 8. a limiting block A; 9. a torsion ring; 10. a threaded hole; 11. a sliding sleeve A; 12. a hinge block B; 13. a balance square bar; 14. a lug A; 15. a support plate; 16. positioning a groove; 17. a compression spring plate; 18. a return spring; 19. a swinging plate A; 20. a notch A; 21. a chute A; 22. a swinging plate B; 23. a notch B; 24. a chute B; 25. a lug B; 26. a sliding sleeve B; 27. a swinging plate C; 28. a screw mandrel B; 29. a limiting block B; 30. a nut; 31. a telescopic rod; 32. an external thread B; 33. a cut C; 34. and D, cutting.

Detailed Description

The attached drawings are schematic diagrams of the implementation of the present invention in order to understand the structural operation principle. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1, the device comprises a base B2, lower support arms 3, upper support arms 4, a hinge block a5, a screw rod a6, a sliding sleeve a11, a hinge block B12, a balance square rod 13, a support plate 15, a return spring 18, a swing plate a19, a swing plate B22, a sliding sleeve B26, a swing plate C27, a screw rod B28, a nut 30 and an expansion link 31, wherein as shown in fig. 2, the two lower support arms 3 which are symmetrically distributed are respectively hinged with the two upper support arms 4, and the ends of the two lower support arms 3 which are not hinged with the corresponding upper support arms 4 are hinged with the base B2; as shown in fig. 1 and 2, the two lower support arms 3 and the two upper support arms 4 are in the same vertical plane; as shown in fig. 1, 2 and 3, each lower support arm 3 is rotatably fitted with a hinge block a5 on the hinge pin of the corresponding upper support arm 4; as shown in fig. 2, 3 and 10, the threaded holes 10 on the two hinge blocks a5 are respectively in threaded fit with the external threads a7 and the external threads B32 on the lead screw a6, and the central axis of the lead screw a which is manually driven to rotate vertically intersects with the central axes of the hinge pins of the lower support arm 3 and the corresponding upper support arm 4; as shown in fig. 2, two sets of lower support arms 3 and upper support arms 4 hinged to each other are bent in opposite directions around corresponding hinge pins, respectively; as shown in fig. 1, 2 and 7, the upper ends of the two upper support arms 4 are respectively hinged with two hinge blocks B12, and the central axes of the hinge pins are perpendicular to the central axis of the screw rod a; as shown in fig. 2 and 5, two hinge blocks B12 are symmetrically hinged on both sides of the sliding sleeve a11, and the hinge block B12 and the hinge pin of the sliding sleeve a11 vertically bisect the hinge block B12 and the hinge pin of the corresponding upper support arm 4.

As shown in fig. 5 and 7, the sliding sleeve a11 has a balance square bar 13 sliding along the direction perpendicular to the hinge pin of the hinge block B12 hinged with the sliding sleeve a 11; as shown in fig. 4 and 7, two ends of the square balance bar 13 are respectively hinged to the centers of the lower end surfaces of the two support plates 15, and the hinge pin of the square balance bar 13 hinged to the two support plates 15 is parallel to the hinge pin of the hinge block B12 hinged to the sliding sleeve a 11; two reset springs 18 for resetting the sliding sleeve A11 are symmetrically arranged on the balance square rod 13; as shown in fig. 4, 6 and 11, the swing plate a19 and the swing plate B22 are hinged to the middle of the screw rod a6 in a crossed manner, and the middle of the screw rod a6 slides relatively in the sliding groove a21 on the swing plate a19 and the sliding groove B24 on the swing plate B22; as shown in fig. 5, the upper ends of the swing plate a19 and the swing plate B22 are respectively hinged with two ends of the square balance bar 13, and the central axes of the hinge pins of the swing plate a19 and the swing plate B22 which are respectively hinged with the square balance bar 13 are respectively superposed on the central axes of the hinge pins of the two ends of the square balance bar 13 which are hinged with the corresponding support plates 15; as shown in fig. 4 and 6, the lower ends of the swing plate a19 and the swing plate B22 are respectively hinged with a sliding sleeve B26, and the hinge pins of the swing plate a19 and the swing plate B22 which are respectively hinged with the two sliding sleeves B26 are parallel to the screw rod a; the screw B slides in the two sliding sleeves B26 along the direction vertical to the screw A; two ends of a swing plate C27 with the middle part rotationally matched with the middle part of the lead screw A are respectively connected with two ends of a lead screw B28 through a telescopic rod 31, and a swing plate C27 is parallel to the lead screw B; two nuts 30 are in threaded fit on the screw B28, and two sliding sleeves B26 are positioned between the two nuts 30.

As shown in fig. 9, the length of the upper support arm 4 is equal to the length of the lower support arm 3, so that after the jack is recovered after use, the inclination of the upper support arm 4 and the inclination of the lower support arm 3 relative to the ground after being bent relative to each other are minimized, the occupied space is reduced, and the storage and the keeping of the jack are facilitated; on the other hand, when the jack is used for supporting the vehicle body or equipment, the supporting plate 15 of the jack can be lifted to a higher height as much as possible, so that the vehicle or equipment with a higher chassis can be effectively supported. As shown in fig. 6 and 11, the length of the swing plate a19 is equal to the length of the swing plate B22, so as to ensure that the two sliding sleeves B26 are symmetrically distributed on the lead screw B28 while the jack effectively supports the car body or the equipment, so that the acting forces of the two sliding sleeves B26 on the lead screw B28 are balanced.

As shown in fig. 1 and 2, the lower end of the base B2 is provided with a base a1, and the horizontal supporting area of the base a1 is larger than that of the base B2. The larger support area of the base A1 makes the whole jack more stable when supporting the vehicle body or equipment.

As shown in fig. 9, one end of the screw a6 is provided with a stopper A8, and the other end is provided with a torsion ring 9. The limiting block A8 prevents the external thread A7 and the corresponding hinge block A5 from tripping due to insufficient length of the lead screw A in the recovery process of the jack after use. The torsion ring 9 drives the screw rod A to rotate by matching with a special tool.

As shown in fig. 7 and 8, the above-mentioned optimized scheme that two ends of the square balance bar 13 are hinged to the centers of the lower end surfaces of the two support plates 15 respectively is that the center of the lower end surface of the support plate 15 is provided with a support lug a14, and the two support lugs a14 are hinged to two ends of the square balance bar 13 respectively. The existence of the support lug A14 enables the support plate 15 to swing with a larger amplitude relative to the balance square bar 13, and avoids the relative swing interference between the support plate 15 and the balance square bar 13.

As shown in fig. 4, 7, and 8, the upper end surface of the supporting plate 15 has a positioning groove 16 that is matched with a supporting portion of the vehicle body or the equipment, and the matching of the positioning groove 16 and the supporting portion of the vehicle body or the equipment makes it difficult for the supported vehicle body or the equipment to slide relative to the supporting plate 15 along a horizontal direction that is parallel to a vertical plane where the upper supporting arm 4 and the lower supporting arm 3 are located, so as to ensure the stability of the supported vehicle body or the equipment, and further improve the safety and effectiveness of the jack in supporting the vehicle body or the equipment.

As shown in fig. 7, two compression spring plates 17 are symmetrically installed on the balance square bar 13, and the two compression spring plates 17 are distributed on two sides of the sliding sleeve a 11; the two return springs 18 are nested on the balance square rod 13, and the two return springs 18 are distributed on two sides of the sliding sleeve A11; two return springs 18 are respectively positioned between the sliding sleeve A11 and the corresponding compression spring plate 17; one end of the return spring 18 is connected with the end face of the slide bar A, and the other end is connected with the corresponding compression spring plate 17.

As shown in fig. 11, the swing plate a19 has a notch a20 at the lower end and a notch C33 at the upper end; the lower end of the swing plate B22 is provided with a notch B23, and the lower end is provided with a notch D34; as shown in fig. 4 and 6, a swinging plate B22 which is hinged with the swinging plate A19 in a cross way relatively swings in a notch A20 on the swinging plate A19; the swinging plate C27 rotates in the notch B23 on the swinging plate B22 relative to the lead screw A; two ends of the balance square rod 13 are respectively hinged in a notch C33 at the upper end of the swinging plate A19 and a notch D34 at the upper end of the swinging plate B22. The existence of the notch A20 and the notch B23 enables the swing plate A19 and the swing plate B22 to be located on the same vertical plane, the acting forces of the swing plate A19 and the swing plate B22 on the middle of the screw rod A are balanced mutually, and the deformation of the screw rod A caused by the unbalanced action of the swing plate A19 and the swing plate B22 on the screw rod A is reduced; meanwhile, the lower ends of the swing plate A19 and the swing plate B22 respectively generate zero torque around the central axis of the screw rod B to the screw rod B through the corresponding sliding sleeves B26, so that the torsion change of the screw rod B caused by the torque generated by the fact that the swing plate A19 and the swing plate B22 are not located on the same vertical plane is avoided; the existence of the notch C33 and the notch D34 ensures that the upper ends of the swinging plate A19 and the swinging plate B22 respectively bear balanced force on two ends of a hinge pin hinged with the balance square bar 13, and deformation caused by single-side stress of the hinge pin is avoided.

As shown in fig. 4 and 6, the lower ends of the swing plate a19 and the swing plate B22 are respectively hinged with a support lug B25 mounted at the upper end of two sliding sleeves B26; two limit blocks B29 are symmetrically installed at two ends of the screw rod B28, and the two limit blocks B29 are respectively connected with two ends of the swing plate C27 through corresponding telescopic rods 31.

As shown in fig. 9, the screw direction of the external thread a7 on the lead screw a is opposite to the screw direction of the external thread B32, so that when the lead screw a rotates, the two hinge blocks a5 move towards or away from each other along the axial direction of the lead screw.

As shown in fig. 1 and 2, the present invention is a further improvement of the conventional scissor jack, wherein the specific structure of the upper support arm 4, the lower support arm 3 and the hinge block a5 is similar to the conventional scissor jack.

The utility model discloses a work flow: in the initial state, the relative bending degree between each lower supporting arm 3 and the corresponding upper supporting arm 4 is maximum, and the height value of the screw rod A6 relative to the base A1 is minimum; the relative distance between the two hinge blocks a5 is the largest; the two telescopic rods 31 are in a maximum compression state; the two sliding sleeves B26 are symmetrically distributed, and the sliding sleeve A11 is positioned in the middle of the balance square rod 13; the screw A is positioned at the top ends of the sliding groove A21 and the sliding groove B24; the two nuts 30 are respectively located at two ends of the screw rod and are respectively tightly attached to the two limit blocks B29.

When the utility model is needed to be used for supporting the vulnerable part on the vehicle body or the equipment, the utility model is firstly placed below the supporting part of the vehicle body or the equipment, the supporting plate 15 is rightly arranged to ensure that the supporting plate 15 is positioned at the horizontal position above the balance square rod 13, and simultaneously, one end of the lead screw A provided with the torsion ring 9 is positioned at the outer side below the vehicle body or the equipment so as to facilitate the operator to drive the lead screw A6 to rotate by matching with the torsion ring 9 through a matching tool, and the positioning grooves 16 on the two supporting plates 15 are simultaneously opposite to the vulnerable part which needs to be supported on the vehicle body or the; then, a tool matched with the utility model is matched with the torsion ring 9 to rotate the lead screw A; the two hinge blocks A5 move towards each other due to the fact that the external thread A7 and the external thread B32 with opposite screwing directions are matched with the threads of the two hinge blocks A5 respectively; the two hinge blocks A5 drive the upper ends of the two lower supporting arms 3 to swing oppositely around hinge points hinged with the base B2 respectively; the screw rod A vertically moves upwards under the swinging action of the two lower supporting arms 3; the upper ends of the two upper support arms 4 respectively swing upwards relative to the corresponding lower support arms 3 around hinge pins hinged with the corresponding lower support arms 3, and the upper ends of the two upper support arms 4 respectively drive the sliding sleeve A11 to vertically move upwards through corresponding hinge blocks B12; the sliding sleeve A11 drives the two support lugs A14 and the two support plates 15 to synchronously move upwards through the balance square rod 13; the lead screw slides downwards along a sliding groove A21 on the swinging plate A19 and a sliding groove B24 on the swinging plate B22; meanwhile, the two ends of the balance square rod 13 respectively and simultaneously drive the swing plate A19 and the upper end wire winding rod A6 of the swing plate B22 to swing oppositely; the lower ends of the swing plate A19 and the swing plate B22 respectively and simultaneously drive the two sliding sleeves B26 to oppositely slide on the screw B; the distance between the swing plate C27 and the screw B is gradually increased, and the two telescopic rods 31 are gradually pulled up; in the process of lifting the two support plates 15, an operator finely adjusts the support plates 15 relative to vulnerable parts needing to be supported on the vehicle body or equipment according to actual conditions, so that the two support plates 15 finally reach support points on the vehicle body or the equipment accurately; when the two supporting plates 15 meet with supporting points on the vehicle body or equipment at the same time, the screw rod A is continuously rotated, so that the supporting plates 15 are continuously moved upwards under the driving of a series of transmissions and form effective support for the vehicle body or the equipment, when the vehicle body or the equipment is jacked to the ground by the jack, the screw rod A is stopped to be rotated, the screw rod A is matched with the threads of the two hinging blocks A5 to have a self-locking function, and therefore, a matched tool for rotating the screw rod A is removed after the screw rod A is stopped to be rotated.

When the vehicle body or equipment is lifted off the ground and the position of the elastic cushion on the supporting plate 15 corresponding to the upper end of the swinging plate A19 or the swinging plate B22 is found to be deflected or needs to be further adjusted, firstly, the nut 30 on the same side of the elastic cushion on the screw B which needs to be adjusted is rotated, so that the nut 30 moves to the sliding sleeve B26 on the same side, and finally, after meeting the sliding sleeve, the nut 30 forms a limit for the movement of the sliding sleeve B26 relative to the screw B in the direction away from the other sliding sleeve B26; then, a tool matched with the torsion ring 9 is used for reversely rotating the lead screw A, the lead screw A drives the two hinge blocks A5 in reverse threaded fit with the lead screw A to move back and forth, the distance between the two hinge blocks A5 is gradually increased, and the two lower supporting arms 3 respectively swing around the hinge point with the base B2 towards two sides; the screw rod A is driven by the two lower supporting arms 3 to vertically move downwards; the two upper supporting arms 4 are respectively driven by the two lower supporting arms 3 to simultaneously drive the sliding sleeve A11 to vertically move downwards through the corresponding hinge block B12; at the moment, the sliding sleeve B26 hinged with the lower end of the swing plate B22 or the lower end of the swing plate A19 is limited by the corresponding nut 30, and the support plate 15 hinged with the upper end of the swing plate B22 or the swing plate A19 always keeps the support of a vehicle body or equipment, so that the balance square rod 13 is driven by the sliding sleeve A11 to swing downwards around a hinge pin hinged with the corresponding support plate 15 at the upper end of the swing plate B22 or the swing plate A19, and the balance square rod 13 and the sliding sleeve A11 slide relatively while the sliding sleeve A11 synchronously swings along with the balance square rod 13 along with the vertical downward movement of the sliding sleeve A11; the return spring 18 corresponding to the upper end of the swing plate B22 or the swing plate a19 is stretched and charged with energy, and the other return spring 18 is compressed and charged with energy; the support plate 15 hinged to the upper end of the swing plate a19 or the swing plate B22 is gradually separated from the support portion of the vehicle body or the equipment as the end of the balance square bar 13 swings down.

Meanwhile, the lower end of the swing plate B22 or the swing plate A19 slightly swings upwards around a hinge pin of which the upper end is hinged with the balance square bar 13; the lower end of the swing plate B22 or the swing plate A19 drives the screw rod B to swing around the screw rod A in the same direction through the corresponding sliding sleeve B26 and the nut 30 playing a limiting role; the screw B drives the swing plate C27 to synchronously swing through the two limit blocks B29 and the two telescopic rods 31; the lower end of the swinging plate A19 or the swinging plate B22 slides along the lead screw B28 to the direction of the nut 30 corresponding to the lower end of the swinging plate A19 or the swinging plate B22 to perform self-adaptive swinging on the whole downward moving swinging plate A19 or the swinging plate B22; when the supporting plate 15 hinged to the upper end of the swinging plate A19 or the swinging plate B22 drives the elastic cushion needing to adjust the position to move downwards for enough space, the screw A stops rotating reversely; after the elastic cushion is adjusted, the screw A is rotated forwards again; the screw rod A drives the two hinge blocks A5 to move oppositely again, and the two lower supporting arms 3 swing oppositely around hinge points with the base B2 respectively and drive the screw rod A to move vertically and upwards; driven by the two lower supporting arms 3, the upper ends of the two upper supporting arms 4 respectively swing upwards relative to the corresponding lower supporting arms 3 around hinge points hinged with the corresponding lower supporting arms 3; the upper ends of the two upper supporting arms 4 respectively drive the sliding sleeve A11 to move upwards through the corresponding hinge block B12; the sliding sleeve A11 drives the balance square rod 13 to swing upwards around a hinge pin hinged between the balance square rod 13 and the upper end of the swing plate B22, and meanwhile, the sliding sleeve A11 slides relative to the balance square rod 13; one end of the balance square rod 13, which is hinged with the upper end of the swinging plate A19, drives the upper end of the swinging plate A19 and the support plate 15 with the position of the elastic cushion adjusted to move upwards; the support plate 15 with the position of the elastic cushion adjusted is gradually close to the support part of the vehicle body or the equipment; under the action of the ascending lead screw A6, the lower end of the swinging plate A19 with the upper end ascending along with the balance square rod 13 drives the corresponding sliding sleeve B26 to slide along the lead screw B to the direction close to the center of the lead screw B; due to the upward movement of the screw rod A, the lower end of the swing plate B22 swings back, under the action of the gravity of the screw rod B28, the telescopic rod 31 and the swing plate C27, the screw rod B28 swings back along with the lower end of the swing plate B22, and the screw rod B28 drives the swing plate C27 to swing back through the two telescopic rods 31; when the support plate 15 where the adjusted elastic cushion is located forms effective support for the support part of the vehicle body or the equipment again, the swing plate A19, the swing plate B22, the swing plate C27, the telescopic rod 31, the screw rod B, the screw rod A6, the two sliding sleeves B26 and the sliding sleeve A11 return to the state when the vehicle body or the equipment is effectively supported again.

If the two support plates 15 effectively support the vehicle body or the vulnerable parts of the equipment, the elastic pads on the two support plates 15 are deflected or the positions of the elastic pads need to be further adjusted, and the two support plates 15 are alternatively lifted and lowered; after the adjustment of the elastic cushion on one support plate 15 is finished and the effective support of the elastic cushion on the vehicle body or equipment is recovered, the nut 30 for limiting the movement of the sliding sleeve B26 along the screw rod B is firstly screwed to the initial position, and then the adjustment operation is carried out on the elastic cushion on the other support plate 15; the operation flow of the lifting adjustment of each supporting plate 15 is completely the same as the above-mentioned flow, and will not be described herein again.

After the jack is used, all the nuts 30 are firstly screwed to the initial positions on the lead screw B, and then the lead screw A is reversely screwed by matching a tool matched with the torsion ring 9; due to the fact that the external threads A7 and the external threads B32 with opposite screwing directions are matched with the threads of the two hinge blocks A5 respectively, the two hinge blocks A5 move oppositely; the two hinge blocks A5 drive the upper ends of the two lower supporting arms 3 to respectively swing back to back around the hinge point hinged with the base B2; the screw rod A vertically moves downwards under the swinging action of the two lower supporting arms 3; the upper ends of the two upper support arms 4 respectively swing downwards relative to the corresponding lower support arms 3 around hinge pins hinged with the corresponding lower support arms 3, and the upper ends of the two upper support arms 4 respectively drive the sliding sleeve A11 to vertically move downwards through corresponding hinge blocks B12; the sliding sleeve A11 drives the two support lugs A14 and the two support plates 15 to synchronously move downwards through the balance square rod 13; the lead screw slides upwards along a sliding groove A21 on the swinging plate A19 and a sliding groove B24 on the swinging plate B22; meanwhile, the two ends of the balance square rod 13 respectively and simultaneously drive the swing plate A19 and the upper end of the swing plate B22 to swing back to back around the screw mandrel A6; the lower ends of the swing plate A19 and the swing plate B22 respectively and simultaneously drive the two sliding sleeves B26 to reversely slide on the screw B; the distance between the swing plate C27 and the screw B is gradually reduced, and the two telescopic rods 31 are gradually compressed; when all the parts of the jack are completely reset, the screw rod A is stopped rotating.

To sum up, the utility model has the advantages that: in the utility model, two supporting plates 15 which are at a certain distance form two supporting points when supporting the vehicle body or the vulnerable part of the equipment; for the single strong point that forms when traditional scissor jack supports automobile body or equipment, the utility model discloses two backup pads 15 are more firm to the support of automobile body or equipment, receive when the automobile body or equipment along perpendicular to under bracing arm 3 and the effort of going up the vertical face in support arm 4 place, the difficult lodging that takes place of jack for jack is firm effective to the support of automobile body or equipment. When the utility model is necessary to support the easily damaged part of the vehicle body or the equipment, in order to reduce or avoid the extrusion deformation damage of the easily damaged part of the vehicle body or the equipment caused by the hard contact of the two supporting plates 15, the upper ends of the two supporting plates 15 are respectively padded with elastic pads to reduce or eliminate the damage of the supporting plates 15 to the vehicle body or the equipment; for traditional scissor jack cushion put the cushion when supporting automobile body or the vulnerable part of equipment, the utility model discloses accomplish the support back to automobile body or the vulnerable part of equipment, if find that the position of the cushion on one of them backup pad 15 is improper or incline a bit, can not take place the corresponding sliding sleeve B26 matched with nut 30 of inclined backup pad 15 through locking and cushion, and shake lead screw A6 and make lead screw A move vertically downwards reversely, make the cushion do not take place under the circumstances that inclined backup pad 15 still supported automobile body or equipment through the cushion, take place the incline or the improper cushion in position place backup pad 15 breaks away from the strong point on automobile body or equipment gradually under corresponding swing plate A19 or swing plate B22 drive; then, the screw A6 is positively shaken after the position of the elastic cushion is adjusted, so that the screw A6 drives the support plates 15 with the adjusted positions to move upwards through a series of transmission and re-support the vehicle body or equipment, and finally the two support plates 15 simultaneously form effective support for vulnerable parts of the vehicle body or equipment; when the traditional scissor jack is used for adjusting the elastic cushion, the vehicle body or equipment must be repeatedly supported or unsupported to adjust the position of the elastic cushion, and in the process of adjusting the elastic cushion, the vehicle body or equipment is repeatedly lifted and falls down, so that for evacuation or equipment with large mass, the reciprocating local lifting easily causes deformation and fatigue damage of vulnerable local parts of the vehicle body or equipment, and the vulnerable local parts of the vehicle body or equipment are damaged; the utility model discloses it must support the easily damaged position's that easily wears fatigue deformation to automobile body or equipment that traditional scissor jack has been avoidd effectively because of the position that needs adjusted the cushion repeatedly, adjusting the in-process to the cushion, need not the part of automobile body or equipment and carry out reciprocal ascending and descending in turn, and the easily damaged position that keeps automobile body or equipment throughout does not take place local motion, avoids automobile body or equipment because of easily damaged position part is reciprocal to go up and down and the automobile body or the equipment that lead to is impaired.

Claims

1. A jack that vulnerable part used which characterized in that: the device comprises a base B, lower supporting arms, upper supporting arms, a hinge block A, a screw rod A, a sliding sleeve A, a hinge block B, a balance square rod, a supporting plate, a reset spring, a swing plate A, a swing plate B, a sliding sleeve B, a swing plate C, a screw rod B, a nut and a telescopic rod, wherein the two lower supporting arms which are symmetrically distributed are respectively hinged with the two upper supporting arms, and one ends of the two lower supporting arms, which are not hinged with the corresponding upper supporting arms, are hinged on the base B; the two lower supporting arms and the two upper supporting arms are positioned on the same vertical plane; each lower supporting arm is rotatably matched with a hinge block A on a hinge pin of the corresponding upper supporting arm; the threaded holes on the two hinge blocks A are respectively in threaded fit with the external thread A and the external thread B on the screw rod A, and the central axis of the screw rod A which is driven to rotate by hand is vertically intersected with the central axis of the hinge pin of the lower support arm and the corresponding upper support arm; the two groups of lower supporting arms and upper supporting arms which are hinged with each other are oppositely bent around corresponding hinge pins respectively; the upper ends of the two upper supporting arms are respectively hinged with the two hinge blocks B, and the central axis of the hinge pin of each upper supporting arm is perpendicular to the central axis of the screw rod A; the two hinge blocks B are symmetrically hinged to two sides of the sliding sleeve A at the same time, and the hinge blocks B and the hinge pins of the sliding sleeve A vertically and equally divide the hinge blocks B and the hinge pins of the corresponding upper supporting arms;

2. A jack for wearing parts according to claim 1, wherein: the length of the upper supporting arm is equal to that of the lower supporting arm, and the length of the swinging plate A is equal to that of the swinging plate B.

3. A jack for wearing parts according to claim 1, wherein: a limiting block A is installed at one end of the screw rod A, and a torsion ring is installed at the other end of the screw rod A.