Framework assembly of central armrest of rear seat for vehicle

Abstract

The invention discloses a central armrest framework assembly of a rear-row seat for a vehicle, which relates to the technical field of automobile seat parts and comprises backrest frameworks, a base framework and an armrest framework arranged between the two groups of backrest frameworks, and the backrest frameworks, the base framework and the armrest framework are hinged through a common rotating shaft. The core innovation lies in that a built-in supporting protection frame is integrated with a multi-stage buffering system through a framework box body, when a passenger is pressed due to sudden braking or collision, a pressing plate is triggered to be in linkage with a toothed bar to drive a reduction gear, after preliminary energy dissipation is conducted through a torsional spring, a special-shaped connecting rod drives a pressure relief column to press downwards, and impact force is divided to a hydraulic base and a pressure dividing ring; the interior of the partial pressure ring is linked with a buffer ring through a cross rod mechanism to extrude an annular air bag, and point impact is converted into uniform surface pressure; under the extreme working condition, a hydraulic oil circulation system of the pressing rod direct-drive transient pressure protection assembly is triggered, and final mechanical locking is formed. According to the design, through gear-hydraulic-airbag-mechanical four-stage dynamic cooperation, self-adaptive partial pressure of impact force is achieved, and the safety and the shake suppression capacity are synchronously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile seat parts, in particular to a rear seat central armrest framework assembly for vehicles. BACKGROUND

[0002] The current rear seat central armrest framework for vehicles generally has the defect that safety and comfort are difficult to coordinate: the traditional structure adopts a rigid frame and an independent hinge to connect the armrest, which can provide basic support, but cannot effectively resolve the instantaneous impact force when the vehicle suddenly brakes or collides, resulting in excessive forward and backward inclination of the passenger; some schemes add local buffer springs or hydraulic rods, but the reaction is delayed due to the dispersed structure, and the compactness of the seat is sacrificed.

[0003] Therefore, the present application provides a rear seat central armrest framework assembly for vehicles to solve one or more of the above problems. SUMMARY

[0004] (I) Technical problems solved In view of the deficiencies of the prior art, the present application provides a rear seat central armrest framework assembly for vehicles to solve the problems raised in the background art.

[0005] (II) Technical solutions To achieve the above purpose, the present application is realized by the following technical solutions, including: a backrest framework, a base framework and an armrest framework, the armrest framework is arranged between two groups of backrest frameworks, each group of backrest frameworks and the bottom of the armrest framework are connected to the base framework through the same rotating shaft, and a support protection frame is installed in the backrest framework through a plurality of groups of fixed supports.

[0006] Preferably, the support protection frame comprises: a framework box body, the framework box body is fixedly connected to the inner frame of the backrest framework through a plurality of groups of fixed supports, a through hole is formed in the center of the front side outer wall of the framework box body, a fixed plate one is fixedly connected to the inner wall of the framework box body, a reduction gear is installed on the fixed plate one through a fixed support, and a torsional spring is installed on the connecting shaft of the fixed support and the reduction gear.

[0007] Preferably, one end of the toothed rod is fixedly connected to the trigger pressure plate, the other end of the toothed rod is movably extended into the framework box body, a guide groove is formed in the front side of the toothed rod, a guide rod is arranged on the rear side of the fixed plate one and movably arranged in the guide groove, and the toothed rod and the reduction gear are engaged.

[0008] Preferably, a U-shaped support is fixedly arranged on the front side of the inner wall of the framework box body, the U-shaped support is located between the two groups of toothed rods, a transient pressure protection assembly is installed in the U-shaped support, a trigger pressure rod is fixedly arranged at the center of the bottom of the trigger pressure plate, and the pressure rod and the transient pressure protection assembly are located on the same axis.

[0009] Preferably, the special-shaped connecting rod is fixed at the bottom of the toothed rod, the pressure distribution ring is fixedly connected with the inner wall of the framework box through the second fixed plate, the top of the pressure relief column is fixedly connected with the center of the bottom of the special-shaped connecting rod, the bottom of the pressure relief column passes through the pressure distribution ring and extends into the hydraulic base, and the hydraulic base is fixedly arranged at the rear end of the inner wall of the framework box.

[0010] Preferably, the first connecting rod is slidably connected with the second fixed plate, the top of the first connecting rod is fixedly provided with an arc-shaped pressure distribution piece, the bottom of the first connecting rod is fixedly provided with an anti-falling plate, and the first connecting rod is sleeved with the buffer spring one on the outer wall of the first connecting rod, and the two ends of the buffer spring one are fixedly connected with the arc-shaped pressure distribution piece and the second fixed plate respectively.

[0011] Preferably, a supporting ring is arranged in the pressure distribution ring, the buffer ring is arranged on the outer wall of the supporting ring through a plurality of groups of connecting arms one, a group of buffer air bags are arranged between the pressure distribution ring and the buffer ring, and a plurality of groups of annular grooves are formed in the outer wall of the supporting ring.

[0012] Preferably, a plurality of groups of pressure distribution push rods are fixedly arranged on the outer wall of the pressure distribution ring, each group of pressure distribution push rods corresponds to a group of annular grooves and a group of connecting arms two, one end of the connecting arm two is fixedly connected with the connecting block, and the other end of the connecting arm two passes through the annular groove and is movably connected with the pressure distribution push rod.

[0013] Preferably, the connecting push block is fixedly connected with the inner ring of the buffer ring, a guide sliding groove is formed in the side, away from the buffer ring, of the connecting push block, two groups of guide blocks are slidably arranged in the guide sliding groove, one end of the cross rod is movably connected with the connecting block, and the other end of the cross rod is movably connected with the two groups of guide blocks respectively.

[0014] Preferably, the instantaneous pressure protection assembly comprises a sealing column, the sealing column is fixedly arranged in the U-shaped cavity of the U-shaped support, a buffer column is arranged in the sealing column, a gap is formed between the buffer column and the sealing column, a plurality of groups of hydraulic oil holes are formed in the outer wall of the buffer column, a piston is movably arranged in the buffer column, one end of a second connecting rod is movably extended into the buffer column and fixedly connected with the piston, the other end of the second connecting rod is fixedly provided with a pressure head, one end of a buffer spring three is fixedly connected with the pressure head, and the other end of the buffer spring three is fixedly connected with the sealing column.

[0015] Compared with the prior art, the present application has the following advantages: The present application creatively constructs a multi-stage linkage static energy buffer system, through dynamic cooperation of the gear-hydraulic-oil bag-mechanical assembly, the safety and comfort of the automobile seat are greatly improved. When the vehicle encounters sudden braking or collision, the impact force is preliminarily eliminated through the gear deceleration mechanism, then is shunted to the annular air bag module through the hydraulic system, and then is converted into evenly dispersed surface pressure through the mechanical linkage structure; meanwhile, the integrated framework box realizes seamless cooperation of various functional units, and triggers the instantaneous protection mechanism to form the final protective barrier under extreme working conditions. This structural innovation enables the seat to have a millisecond-level impact response active protection capability, effectively inhibits human body shaking and disperses the stress of the framework components. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of the main structure of the application; Figure 2 is a schematic view of the plan structure of the support protection frame of the application; Figure 3 is a schematic view of the sectional structure of the voltage divider ring in the application; Figure 4 is a schematic view of the main structure of the application Figure 3 is an enlarged schematic view of the structure at A in the application; Figure 5 is a schematic view of the explosion structure of the transient pressure protection assembly in the application; Figure 6 is a schematic view of the main structure of the transient pressure protection assembly in the application.

[0017] In the figure: 1, backrest framework; 2, base framework; 3, armrest framework; 4, rotating shaft; 5, fixed support one; 6, support protection frame; 7, armrest accommodating groove; 8, armrest; 9, framework box; 10, trigger pressing plate; 11, toothed rod; 12, trigger pressing rod; 13, through hole; 14, speed reduction gear; 15, guide groove; 16, U-shaped support; 17, transient pressure protection assembly; 18, fixed plate one; 19, fixed support two; 20, special-shaped connecting rod; 21, pressure relief column; 22, voltage divider ring; 23, hydraulic base; 24, arc-shaped voltage divider; 25, fixed plate two; 26, anti-falling plate; 27, buffer spring one; 28, first connecting rod; 29, voltage divider pushing rod; 30, support ring; 31, connecting arm one; 32, buffer air bag; 33, buffer ring; 34, connecting block; 35, cross rod; 36, guide sliding groove; 37, connecting pushing block; 38, guide block; 39, buffer spring two; 40, second connecting rod; 41, piston; 42, buffer column; 43, hydraulic oil hole; 44, sealing column; 45, oil injection hole; 46, connecting arm two; 47, annular groove; 48, pressure head; 49, buffer spring three. DETAILED DESCRIPTION

[0018] In the present application, the description such as "first", "second" and the like is only for the purpose of description, and does not mean to particularly indicate the order or sequence, nor to limit the present application, which is merely to distinguish the protection assembly or operation described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features of various embodiments can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0019] Embodiment 1 Please refer to Figure 1 , the present application provides a technical means, comprising: backrest skeleton 1, base skeleton 2 and armrest skeleton 3, armrest skeleton 3 is arranged between two groups of backrest skeleton 1, each group of backrest skeleton 1 and the bottom of armrest skeleton 3 are connected with base skeleton 2 through the same rotating shaft 4, and support protection frame 6 is installed in backrest skeleton 1 through a plurality of groups of fixed support 5.

[0020] The working principle and beneficial effects of the above scheme are as follows: the backbone base connects the backrest skeleton 1, the base skeleton 2 and the armrest skeleton 3 through the common rotating shaft 4 to realize the hinge connection. The design allows the armrest skeleton 3 to freely turn between the two groups of backrest skeleton 1: unfolded state: armrest skeleton 3 is placed horizontally to provide seating support; folding state: armrest skeleton 3 is turned up to lean against backrest skeleton 1, saving rear space.

[0021] The current trolley starts with a momentary speed too fast or sudden braking, and the body of the passenger will first lean and then fall backward on the backrest cushion. In order to improve the comfort of the passengers, the current solution for the skeleton of the rear seat is to fill a plurality of springs + sponge seat cushions. In the present application, the support protection frame 6 is rigidly fixed inside the backrest skeleton 1 through a plurality of groups of fixed support 5, forming an internal reinforcing structure. When the passenger leans against the backrest or uses the armrest, the support protection frame 6 disperses the local pressure to the whole backrest skeleton 1. If a collision occurs, it can resist deformation as a rigid support to prevent the skeleton from breaking and piercing the passenger. The support protection frame 6 is also used to protect the passengers under different pressures and improve comfort. Through the multi-stage dispersion and buffering form, the comfort of the passengers is greatly improved. Through the setting of the instantaneous pressure protection assembly 17 in the support protection frame 6, the safety of the passengers can be greatly improved when the vehicle is subjected to impact or the instantaneous inertial force is too large.

[0022] Embodiment 2 Based on embodiment 1, please refer to Figures 1-2 , the support protection frame 6 comprises: a skeleton box 9, the skeleton box 9 is fixedly connected with the inner frame of the backrest skeleton 1 through a plurality of groups of fixed support 5, a through hole 13 is formed in the center of the front outer wall of the skeleton box 9, a fixed plate 18 is fixedly connected with the inner wall of the skeleton box 9, a reduction gear 14 is installed on the fixed plate 18 through a fixed support 19, and a torsional spring is installed on the connecting shaft of the reduction gear 14 and the fixed support 19.

[0023] Preferably, one end of the tooth bar 11 is fixedly connected with the trigger pressure plate 10, the other end of the tooth bar 11 extends into the skeleton box 9, a guide groove 15 is formed in the front side of the tooth bar 11, a guide rod is arranged on the rear side of the fixed plate one 18 and movably arranged in the guide groove 15, and the tooth bar 11 is engaged with the reduction gear 14.

[0024] Preferably, the U-shaped support 16 is fixedly arranged on the front side of the inner wall of the skeleton box 9 and located between the two groups of tooth bars 11, the instantaneous pressure protection assembly 17 is installed in the U-shaped support 16, and the trigger pressure rod 12 is fixedly arranged on the center of the bottom of the trigger pressure plate 10 and located on the same axis as the instantaneous pressure protection assembly 17.

[0025] Preferably, the special-shaped connecting rod 20 is fixedly arranged on the bottom of the tooth bar 11, the pressure distribution ring 22 is fixedly connected with the inner wall of the skeleton box 9 through the fixed plate two 25, the pressure relief column 21 is fixedly connected with the bottom center of the special-shaped connecting rod 20, the bottom of the pressure relief column 21 penetrates through the pressure distribution ring 22 and extends into the hydraulic base 23, and the hydraulic base 23 is fixedly arranged on the rear end of the inner wall of the skeleton box 9.

[0026] Preferably, the first connecting rod 28 is slidably connected with the fixed plate two 25, the arc-shaped pressure distribution piece 24 is fixedly arranged on the top of the first connecting rod 28, the anti-falling plate 26 is fixedly arranged on the bottom of the first connecting rod 28, the buffer spring one 27 is sleeved on the outer wall of the first connecting rod 28, and the buffer spring one 27 is fixedly connected with the arc-shaped pressure distribution piece 24 and the fixed plate two 25 at both ends.

[0027] The working principle and beneficial effects of the above scheme are as follows: the normal backrest of the passenger will not trigger the support protection frame 6 arranged in the backrest skeleton 1, when the trigger pressure plate 10 is pressed (i.e. the passenger gives a certain pressure to the backrest, which indicates that the current vehicle is at a too fast instantaneous speed or is suddenly braked), the trigger pressure plate 10 will push the two groups of tooth bars 11 to slide backward along the skeleton box 9, thereby driving the reduction gear 14 to rotate, since the torsional spring is arranged on the connecting shaft of the reduction gear 14 and the fixed support two 19, the torsional spring will preliminarily buffer the backward pushing of the trigger pressure plate 10 under the action of the elastic force of the torsional spring, and since the guide groove 15 is arranged on the tooth bar 11, the tooth bar 11 is limited by the guide rod at the rear end of the fixed plate one 18, so that it can move stably, and the pressure can be relieved through the seat and the reduction gear 14, when the pressure is too large, the special-shaped connecting rod 20 will be continuously pushed backward, at this time, a small part of the pressure will press down the arc-shaped pressure distribution piece 24 through the two ends of the special-shaped connecting rod 20, then the buffer spring one 27 is compressed and the first connecting rod 28 pushes the anti-falling plate 26 to move backward for buffering, and the remaining large part of the pressure is dispersed to the pressure distribution ring 22 and the hydraulic base 23 through the pressure relief column 21, thereby the comfort of the passenger can be greatly improved.

[0028] Example 3 On the basis of any one of embodiments 1-2, please refer to Figures 2-4 The support ring 30 is arranged in the pressure distribution ring 22, the buffer ring 33 is arranged on the outer wall of the support ring 30 through a plurality of groups of connecting arms one 31, a circle of buffer air bags 32 is arranged between the pressure distribution ring 22 and the buffer ring 33, and a plurality of groups of annular grooves 47 are arranged on the outer wall of the support ring 30.

[0029] Preferably, a plurality of groups of pressure distribution push rods 29 are fixedly arranged on the outer wall of the pressure distribution ring 22, each group of pressure distribution push rods 29 corresponds to a group of annular grooves 47 and a connecting arm two 46, one end of the connecting arm two 46 is fixedly connected with the connecting block 34, and the other end of the connecting arm two 46 passes through the annular groove 47 and is movably connected with the pressure distribution push rod 29.

[0030] Preferably, the connecting push block 37 is fixedly connected with the inner ring of the buffer ring 33, a guide sliding groove 36 is arranged on the side of the connecting push block 37 away from the buffer ring 33, two groups of guide blocks 38 are slidably arranged in the guide sliding groove 36, one end of the cross rod 35 is movably connected with the connecting block 34, and the other end of the cross rod 35 is movably connected with the two groups of guide blocks 38.

[0031] The working principle and beneficial effects of the above scheme are as follows: when the pressure relief column 21 is pressed to move backward through the pressure distribution ring 22, the plurality of groups of pressure distribution push rods 29 arranged on the outer wall of the pressure relief column 21 will synchronously drive the connecting arm two 46 to push the connecting block 34 to move toward the buffer ring 33, at this time, the two ends of the cross rod 35 in the guide sliding groove 36 will drive the two groups of guide blocks 38 to move away from each other, the buffer spring two 39 will be deformed under stress, and when the connecting push block 37 is stressed too much, the obliquely arranged connecting arm two 46 on the surface will push the connecting push block 37 through the cross rod 35 and drive the buffer ring 33 to rotate along the inner wall of the pressure distribution ring 22, and the arrangement of the annular groove 47 will not interfere with the connecting arm two 46, at this time, the pressure applied by the buffer ring 33 on the buffer air bag 32 will be uniformly transmitted outward, and in the above manner, the pressure suffered by the passengers can be greatly alleviated, thereby greatly improving the comfort of the passengers.

[0032] Embodiment 4 On the basis of any one of embodiments 1-3, please refer to Figures 5-6 The instantaneous pressure protection assembly 17 comprises a sealing column 44, the sealing column 44 is fixedly arranged in the U-shaped cavity of the U-shaped support 16, the buffer column 42 is arranged in the sealing column 44, and a gap is left between the buffer column 42 and the sealing column 44, a plurality of groups of hydraulic oil holes 43 are arranged on the outer wall of the buffer column 42, the piston 41 is movably arranged in the buffer column 42, one end of the second connecting rod 40 is movably extended into the buffer column 42 and is fixedly connected with the piston 41, the other end of the second connecting rod 40 is fixedly provided with a pressure head 48, one end of the buffer spring three 49 is fixedly connected with the pressure head 48, and the other end of the buffer spring three 49 is fixedly connected with the sealing column 44.

[0033] The working principle and beneficial effects of the above-mentioned scheme are as follows: in order to improve the safety of the passengers, when the vehicle is subjected to a collision or a transient inertia force that is too large and exceeds the limit that can be buffered in embodiments 2 and 3, the trigger pressure rod 12 will pass through the through hole 13 and contact the pressure head 48, at the same time, the second connecting rod 40 pushes the piston 41 to move backward in the buffer column 42, at this time, the piston 41 will extrude the hydraulic oil in the buffer column 42, so that the hydraulic oil at the rear end flows out from the rear hydraulic oil hole 43 and enters the sealed column 44, at the same time, the hydraulic oil at the front end flows back to the buffer column 42 through the front hydraulic oil hole 43 (the hydraulic oil is located on the front side of the piston 41 at this time), thereby greatly reducing the impact speed of the second connecting rod 40, and when the collision or transient inertia force ends, under the pulling of the buffer spring three 49 and the reset of the trigger pressure plate 10, the second connecting rod 40 will drive the piston 41 to reset, the hydraulic oil on the front side of the piston 41 will flow back to the buffer column 42 through the front hydraulic oil hole 43 and flow back to the sealed column 44 through the rear hydraulic oil hole 43, completing the recycling, thereby greatly improving the safety of the passengers.

[0034] The basic principles and main features of the present application and the advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A central armrest framework assembly of a rear seat for a vehicle, comprising: backrest frameworks (1), a base framework (2), and an armrest framework (3), the armrest framework (3) being arranged between two groups of backrest frameworks (1), each group of backrest frameworks (1) and the armrest framework (3) being connected to the base framework (2) through the same rotating shaft (4), and a support protection frame (6) being arranged in the backrest framework (1) through a plurality of fixed supports (5). 2.The central armrest framework assembly of a rear seat for a vehicle according to claim 1, wherein the support protection frame (6) comprises a framework box (9) fixedly connected to the inner frame of the backrest framework (1) through a plurality of fixed supports (5), a through hole (13) being formed in the center of the front outer wall of the framework box (9), a fixed plate (18) being fixedly connected to the inner wall of the framework box (9), a reduction gear (14) being arranged on the fixed plate (18) through a fixed support (19), and a torsional spring being arranged on the connecting shaft of the reduction gear (14) and the fixed support (19). 3.The central armrest framework assembly of a rear seat for a vehicle according to claim 2, wherein one end of a toothed rod (11) is fixedly connected to a trigger pressing plate (10), the other end of the toothed rod (11) is movably extended into the framework box (9), a guide groove (15) is formed in the front side of the toothed rod (11), a guide rod is arranged on the rear side of the fixed plate (18) and movably arranged in the guide groove (15), and the toothed rod (11) is engaged with the reduction gear (14). 4.The central armrest framework assembly of a rear seat for a vehicle according to claim 2, wherein a U-shaped support (16) is fixedly arranged on the inner wall of the framework box (9) and located between the two toothed rods (11), a transient pressure protection assembly (17) is arranged in the U-shaped support (16), and a trigger pressing rod (12) is fixedly arranged on the center of the bottom of the trigger pressing plate (10) and located on the same axis as the transient pressure protection assembly (17). 5.The central armrest framework assembly of a rear seat for a vehicle according to claim 3, wherein a special-shaped connecting rod (20) is fixedly arranged on the bottom of the toothed rod (11), a pressure distribution ring (22) is fixedly connected to the inner wall of the framework box (9) through a fixed plate (25), a pressure relief column (21) is fixedly connected to the center of the bottom of the special-shaped connecting rod (20), the bottom of the pressure relief column (21) penetrates through the pressure distribution ring (22) and extends into a hydraulic base (23), and the hydraulic base (23) is fixedly arranged on the rear end of the inner wall of the framework box (9). 6.The central armrest framework assembly of a rear seat for a vehicle according to claim 5, wherein a first connecting rod (28) is slidably connected to the fixed plate (25) in an up-down direction, an arc-shaped pressure distribution piece (24) is fixedly arranged on the top of the first connecting rod (28), a anti-falling plate (26) is fixedly arranged on the bottom of the first connecting rod (28), a buffer spring (27) is sleeved on the outer wall of the first connecting rod (28), and the two ends of the buffer spring (27) are fixedly connected to the arc-shaped pressure distribution piece (24) and the fixed plate (25), respectively. ​ ​ ​ ​ ​ ​ ​ 7. The central armrest framework assembly of the rear seat of a vehicle according to claim 6, characterized in that, The support ring (30) is installed in the pressure distribution ring (22), the buffer ring (33) is installed on the outer wall of the support ring (30) through a plurality of groups of connecting arms (31), a circle of buffer air bags (32) is arranged between the pressure distribution ring (22) and the buffer ring (33), and a plurality of groups of annular grooves (47) are formed in the outer wall of the support ring (30).

8. The central armrest framework assembly of the rear seat of a vehicle according to claim 7, characterized in that, The pressure release column (21) is fixedly provided with a plurality of groups of pressure distribution push rods (29) on the outer wall in the pressure distribution ring (22), each group of pressure distribution push rods (29) corresponds to a group of annular grooves (47) and a connecting arm (46), one end of the connecting arm (46) is fixedly connected with the connecting block (34), and the other end of the connecting arm (46) passes through the annular groove (47) and is movably connected with the pressure distribution push rod (29).

9. The central armrest framework assembly of the rear seat of a vehicle according to claim 8, characterized in that, The connecting push block (37) is fixedly connected with the inner ring of the buffer ring (33), the connecting push block (37) is provided with a guide sliding groove (36) on the side away from the buffer ring (33), two groups of guide blocks (38) are slidably arranged in the guide sliding groove (36), one end of the cross rod (35) is movably connected with the connecting block (34), and the other end of the cross rod (35) is movably connected with the two groups of guide blocks (38) respectively.

10. The central armrest framework assembly of the rear seat of a vehicle according to claim 4, characterized in that, The instantaneous pressure protection assembly (17) comprises a sealing column (44) fixedly arranged in the U-shaped cavity of the U-shaped support (16), a buffer column (42) installed in the sealing column (44), a gap between the buffer column (42) and the sealing column (44), a plurality of groups of hydraulic oil holes (43) formed in the outer wall of the buffer column (42), a piston (41) movably arranged in the buffer column (42), a second connecting rod (40) having one end movably extended into the buffer column (42) and fixedly connected with the piston (41), the other end of the second connecting rod (40) fixedly provided with a pressure head (48), a buffer spring three (49) having one end fixedly connected with the pressure head (48) and the other end fixedly connected with the sealing column (44).

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