Wheelchair for limb rehabilitation

Abstract

The application discloses a wheelchair for limb rehabilitation and belongs to the technical field of wheelchairs. The wheelchair comprises two supporting arms and a shaft rod penetrating the upper end of the supporting arms, the upper end of each supporting arm is fixedly connected with an n-shaped supporting frame, the upper surfaces of the two supporting frames support a chair frame, the two ends of the shaft rod are fixedly connected with rear supporting wheels, the shaft rod bearing penetrates the protrusions on the lower surface of the chair frame, the lower end of the supporting arm is connected with a front supporting wheel through a bearing, the shaft rod further penetrates the supporting frame through a bearing, an adjustable swing mechanism is arranged on the part of the shaft rod inside the supporting frame, and two adjustable leg lifting mechanisms are installed on the chair frame. The wheelchair can rotate through the rear supporting wheels, realizes the action of lifting and lowering the lower limbs of a patient, and further can assist the patient in exercising the lower limbs when the lower limbs of the patient are weak, so that the patient's lower limbs can be recovered, the patient's lower limbs are prevented from being in a long-term inactivity state, and the atrophy of the lower limbs is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheelchairs, in particular to a wheelchair for limb rehabilitation. BACKGROUND

[0002] With the development of science and technology, independent medical processes are gradually interconnected, thereby realizing an interconnected medical system, such as an online and offline combination, a platform for sharing data in a medical process in real time, etc. Through the medical system, the condition of a patient can be monitored in real time, which is beneficial to timely adjustment of a treatment plan, thereby helping the patient to recover soon.

[0003] A hemiplegic patient is usually accompanied by limb hemiplegia and muscle weakness, so he often needs to use a wheelchair for daily activities. In order to improve the medical system, various medical devices are installed on the wheelchair and are connected in real time, which is used to transmit the condition of the patient on the wheelchair to the rear platform in real time, so as to monitor the patient's physical condition and ensure that the patient can be rescued in time when an emergency occurs.

[0004] However, the ordinary wheelchair is not convenient for the patient to exercise, which will not help the patient to recover. In order to facilitate the patient to exercise the limbs, a limb rehabilitation wheelchair is provided, which can facilitate the patient to exercise the limbs, thereby preventing atrophy and other conditions caused by long-term non-exercise of the affected area. For example, the wheelchair for upper and lower limb medical rehabilitation disclosed in the publication No. CN109223340A can exercise the lower limbs of a person by repeatedly stepping on the pedal, which meets the needs of disabled patients to exercise lower limb muscles and recover physiological functions. However, there are still some technical problems in the use process.

[0005] In the prior art, the patient needs to step on the pedal to exercise the lower limbs, but the lower limbs of the patient are generally in a state of weakness after being ill, at which time the patient cannot step on the pedal, thereby preventing the patient from exercising the lower limbs.

[0006] Therefore, a wheelchair for limb rehabilitation is needed to solve the above problems. SUMMARY

[0007] The present application relates to the technical field of wheelchairs, in particular to a wheelchair for limb rehabilitation.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0009] The utility model provides a kind of wheelchair for limb rehabilitation, including two support arms and the shaft rod of bearing through its upper end, the upper end of each support arm is fixedly connected with n-shaped support frame, and the upper surface of two support frames supports chair frame, the both ends of the shaft rod are fixedly connected with rear support wheel, and shaft rod bearing passes through the convex of chair frame lower surface, the lower end of the support arm is bearing connected with front support wheel, the shaft rod is also arranged with bearing through support frame, and the part of shaft rod in support frame is provided with adjustable swing mechanism, two groups of adjustable leg lifting mechanism are installed on the chair frame, and adjustable leg lifting mechanism includes connecting plate for supporting patient's leg, the adjustable swing mechanism is connected with connecting plate by pressing mechanism, and pressing mechanism includes angle bar arranged on each support arm, and angle bar is connected with corresponding support arm shaft.

[0010] Preferably, the adjustable leg lifting mechanism further includes a support rod shaft connected to the lower surface of the chair frame, and a support plate is fixedly connected to the front side of the support rod, the connecting plate is shaft connected to the front side of the support plate, and a gas bag is provided between the lower end of the front side of the support plate and the connecting plate, the gas bag is connected to the gas ball through the gas pipe, and the gas ball is connected to the armrest of the chair frame, the support rod is also shaft connected with a pedal.

[0011] Preferably, the rear side of the support rod is provided with a triangular block, and the triangular block is in sliding contact with the end of the angle bar.

[0012] Preferably, the adjustable swing mechanism includes a swing ring that is fitted outside the shaft rod, and the swing ring is shaft connected to the corresponding position of the shaft rod, so as to facilitate the swing of the swing ring outside the shaft rod, the lower end of the support frame is limitingly movably penetrated by a movable plate, and the lower end of the support frame is also fixedly connected with a limit sleeve plate, the limit sleeve plate is fitted outside the corresponding movable plate, and a swing ball group is mounted on the upper surface of the movable plate, the shaft end of the swing ball group is bearing penetrated by the movable plate, and the ball end of the swing ball group is slidingly connected to the outside of the swing ring.

[0013] Preferably, the adjustable swing mechanism further comprises an adjusting ring sleeved outside the shaft rod, and the adjusting ring is arranged one-to-one with the swing ring; the inner side of the adjusting ring is connected with the outer side of the shaft rod through a sliding structure; the sliding structure comprises a strip-shaped groove arranged on the outer side of the shaft rod; the sliding structure further comprises a protrusion fixedly connected to the inner side of the adjusting ring, and the protrusion is in sliding connection with the strip-shaped groove, so as to limit the adjusting ring and ensure that the adjusting ring rotates synchronously with the shaft rod; the inner side of the upper end of the support frame is fixedly connected with a connecting piece, and a limiting rod is fixedly connected to the connecting piece (25); a threaded rod is sleeved outside the limiting rod; a rolling wheel is arranged on the outer side of one end of the threaded rod and is in limiting rolling connection with the outer side of the adjusting ring; the outer side of the other end of the threaded rod is threadedly connected with one end of a threaded tube, and the other end of the threaded tube penetrates through the corresponding support frame in bearing; an adjusting arm is arranged between the swing ring and the corresponding adjusting ring, and the two ends of the adjusting arm are respectively connected with the swing ring and the adjusting ring in bearing.

[0014] Preferably, the armrest of the chair frame is fixedly connected with a support piece, and a adjusting disc is connected with the support piece in bearing; the adjusting disc is connected with the other end of the threaded tube through a belt transmission structure; a structure cover sleeved outside the belt transmission structure is arranged between the support arm and the adjusting disc.

[0015] Preferably, the threaded rod is a tubular structure with a circular outer side and a square inner side; the limiting rod is a prism; and the square structure on the inner side of the threaded rod is matched with the prism-shaped limiting rod, so as to limit the threaded rod and prevent the threaded rod from rotating.

[0016] Preferably, the inner side of the swing ring is a straight slot structure, and the position of the swing ring arranged on the shaft rod is similar to the structure of the inner side of the swing ring.

[0017] Preferably, the top pressing mechanism further comprises an inclined through groove penetrating through both sides of the movable plate, and a guide frame is arranged in penetrating through the inclined through groove; the guide frame is fixedly connected with a connecting arm, and the two ends of the connecting arm are fixedly connected with a sliding block one and a sliding block two, respectively; the support arm and the angle rod are respectively provided with a sliding groove one and a sliding groove two, and the sliding block one and the sliding block two are respectively in sliding connection with the corresponding sliding groove one and sliding groove two.

[0018] Compared with the prior art, the wheelchair for limb rehabilitation of the present application has the advantages that: compared with the prior art, the wheelchair for limb rehabilitation is provided with various medical devices, so as to monitor the condition of the patient, and the rear support wheel can be rotated to assist the patient to lift and lower the lower limbs, so that the patient can exercise the lower limbs when the lower limbs are weak, which is helpful for the rehabilitation of the lower limbs and avoids the atrophy of the lower limbs due to long-term inactivity of the lower limbs.

[0019] 1、Patients through the upper limbs rotate the rear support wheel, or by others to push the wheelchair, the shaft will rotate, and can drive the swing ring and the adjustment ring rotation, when the two are no longer parallel to each other, the swing ring will swing, and then through the swing ball set driven movable plate reciprocating movement, to achieve the structure of the guide frame and connecting arm reciprocating movement under the action of the slider and the chute, through the connecting arm reciprocating movement, can be through the slider and the chute to make the angle bar swing, and then can extrude the supporting rod, so that it drives the support plate and the connecting plate rotation, with the gravity of the lower limbs of the patient, can make the patient's lower limbs reciprocating swing, and then help to exercise the lower limbs of the patient;

[0020] 2、Rotate the adjustment disc, can drive the threaded tube rotation through the belt transmission structure, and then can cause its threaded connection of threaded rod under the limit of the limit rod along its axial direction movement, so that the adjustment ring can be driven by the rolling wheel on the shaft, because the adjustment ring is connected with the swing ring through the adjusting arm, and then can push the swing ring relative to the shaft rotation, that is, can change the degree of inclination of the swing ring relative to the adjustment ring, in order to change the amplitude of the support plate and the connecting plate rotation, so as to adjust the amplitude of the patient's lower limbs according to the need, avoid the amplitude too large, cause the lower limbs injury;

[0021] 3、By extruding the gas ball can be gas supply for the air bag, so as to change the angle between the support plate and the connecting plate, help to change the stage of the patient's lower limbs exercise, such as from the original natural state of 5°, and then gradually from 5° to 10°, in the process of cooperation adjustable swing mechanism can realize the stage of the patient's lower limbs exercise, is beneficial to the rehabilitation of the patient's lower limbs. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the main view structure schematic diagram of the present application;

[0023] Figure 2 is the local view structure schematic diagram of the present application;

[0024] Figure 3 is the local sectional view structure schematic diagram of the present application;

[0025] Figure 4 is the A point of the present application Figure 3 enlarged structure schematic diagram;

[0026] Figure 5 is the support arm and chair frame connection structure schematic diagram of the present application;

[0027] Figure 6 is the B point of the present application Figure 5 enlarged structure schematic diagram;

[0028] Figure 7 is the support arm and shaft connection structure schematic diagram of the present application;

[0029] Figure 8 It is a partial sectional view of the chair frame of the present application.

[0030] Figure 9 It is a partial sectional view of the chair frame of the present application. Figure 8 It is a partial sectional view of the chair frame of the present application.

[0031] Figure 10 It is a partial sectional view of the chair frame of the present application.

[0032] In the figure: 1, support arm; 2, front support wheel; 3, rear support wheel; 4, chair frame; 5, support plate; 6, air bag; 7, connecting plate; 8, air conveying pipe; 9, air conveying ball; 10, pedal; 11, supporting rod; 12, support frame; 13, adjusting disc; 14, angle rod; 15, shaft rod; 16, swing ring; 17, adjusting ring; 18, movable plate; 19, limiting sleeve plate; 20, inclined through slot; 21, guide frame; 22, rolling wheel; 23, threaded pipe; 24, limiting rod; 25, connecting piece; 26, structure cover; 27, swing ball group; 28, belt transmission structure; 29, threaded rod; 30, connecting arm; 31, sliding block one; 32, sliding groove one; 33, sliding block two; 34, sliding groove two; 35, support piece; 36, adjusting arm. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] Please refer to Figures 1-10 The present application provides the following technical solutions:

[0035] Embodiment one: in order to solve the problem that the patient cannot exercise the lower limbs by stepping on the pedal with the lower limbs when using the wheelchair for limb rehabilitation in the prior art, the technical scheme is provided as follows, specifically, a wheelchair for limb rehabilitation, comprising two support arms 1 and a shaft 15 penetrating the upper end of the support arms, the upper end of each support arm 1 is fixedly connected with an n-shaped support frame 12, the upper surfaces of the two support frames 12 support a chair frame 4, the two ends of the shaft 15 are fixedly connected with rear support wheels 3, the shaft 15 penetrates the protrusions on the lower surface of the chair frame 4, the lower end of the support arm 1 is connected with a front support wheel 2 in a bearing mode, the shaft 15 further penetrates the support frame 12 in a bearing mode, and the part of the shaft 15 inside the support frame 12 is provided with an adjustable swing mechanism, the adjustable swing mechanism is connected with a connecting plate 7 through a jacking mechanism, and the jacking mechanism comprises an angle bar 14 arranged on each support arm 1, and the angle bar 14 is connected with the corresponding support arm 1 in an axial mode.

[0036] The adjustable swing mechanism comprises a swing ring 16 sleeved outside the shaft 15, and the swing ring 16 is connected with the shaft 15 at a corresponding position axis, so as to facilitate the swing of the swing ring 16 outside the shaft 15; the lower end of the support frame 12 is limitedly penetrated by a movable plate 18, and the lower end of the support frame 12 is also fixedly connected with a limiting sleeve plate 19, the limiting sleeve plate 19 is sleeved outside the corresponding movable plate 18, and the upper surface of the movable plate 18 is provided with a swing ball group 27, the shaft end bearing of the swing ball group 27 is arranged to penetrate the movable plate 18, and the ball end of the swing ball group 27 is slidingly connected to the outside of the swing ring 16; the adjustable swing mechanism further comprises an adjusting ring 17 sleeved outside the shaft 15, and the adjusting ring 17 is arranged one by one with the swing ring 16; the inner side of the adjusting ring 17 is connected with the outer side of the shaft 15 through a sliding structure, the sliding structure comprises a strip-shaped groove arranged outside the shaft 15, and the sliding structure further comprises a protrusion fixedly connected to the inner side of the adjusting ring 17, the protrusion is slidingly connected with the strip-shaped groove, and is used for limiting the adjusting ring 17 and ensuring that the adjusting ring 17 rotates synchronously with the shaft 15; the inner side of the support frame 12 is fixedly connected with a connecting piece 25, and the connecting piece 25 is fixedly connected with a limiting rod 24; the outer side of the limiting rod 24 is sleeved with a threaded rod 29, the outer side of one end of the threaded rod 29 is provided with a rolling wheel 22, and the rolling wheel 22 is limitingly and rollingly connected to the outer side of the adjusting ring 17; the outer side of the other end of the threaded rod 29 is threadedly connected with one end of a threaded tube 23, and the other end of the threaded tube 23 is penetratingly arranged to the corresponding support frame 12; an adjusting arm 36 is arranged between the swing ring 16 and the corresponding adjusting ring 17, and the two ends of the adjusting arm 36 are respectively connected with the swing ring 16 and the adjusting ring 17; a support piece 35 is fixedly connected to the armrest of the chair frame 4, and a adjusting disc 13 is bearingly connected to the support piece 35; the adjusting disc 13 is connected with the other end of the threaded tube 23 through a belt transmission structure 28; a structure cover 26 sleeved outside the belt transmission structure 28 is arranged between the support arm 1 and the adjusting disc 13; the threaded rod 29 is a tubular structure with an outer circle and an inner square; the limiting rod 24 is a prism, and the square structure on the inner side of the threaded rod 29 is consistent with the prism-shaped limiting rod 24, so as to limit the threaded rod 29 and prevent it from rotating; the inner side of the swing ring 16 is a straight slot structure, and the position of the swing ring 16 arranged on the shaft 15 is similar to the structure on the inner side of the swing ring 16.

[0037] According to Figures 2-10 , in use, the patient sits on the chair frame 4, steps on the pedal 10, and supports the lower limbs on the connecting plate 7, then the patient rotates the rear support wheel 3 with the upper limbs, or others push the wheelchair, so that the shaft 15 rotates;

[0038] During the rotation of the shaft 15, the swing ring 16 will swing with the rotation of the shaft 15 due to the non-parallelism of the swing ring 16 and the adjusting ring 17, and further drive the movable plate 18 to move back and forth;

[0039] When the movable plate 18 reciprocates, the connecting arm 30 is driven to reciprocate through the inclined through groove 20 and the guide frame 21 under the action of the sliding block one 31 and the sliding groove one 32.

[0040] When the connecting arm 30 reciprocates, the angle lever 14 is driven to reciprocate through the sliding block two 33 and the sliding groove two 34.

[0041] When the angle lever 14 reciprocates, the triangular block on the supporting rod 11 is continuously pressed to drive the connecting plate 7 to rotate, and the patient's lower limbs can reciprocate within a certain range under the action of the gravity of the lower limbs, so that the patient's lower limbs are exercised.

[0042] In addition, the rotating adjusting disc 13 can drive the threaded pipe 23 to rotate through the belt transmission structure 28, the threaded rod 29 connected with the threaded pipe 23 is driven to move the rolling wheel 22 under the limiting action of the limiting rod 24, and then the inclination angle of the swinging ring 16 can be changed through the adjusting arm 36 to adjust the amplitude of the rotation of the connecting plate 7, which is helpful to adjust the amplitude of the exercise of the patient's lower limbs.

[0043] The top pressing mechanism further comprises the inclined through groove 20 penetrating through both sides of the movable plate 18, the guide frame 21 penetrating through the inclined through groove 20, the connecting arm 30 fixedly connected to the guide frame 21, the sliding block one 31 and the sliding block two 33 respectively fixedly connected to both ends of the connecting arm 30, the sliding groove one 32 and the sliding groove two 34 respectively provided on the supporting arm 1 and the angle lever 14, and the sliding block one 31 and the sliding block two 33 respectively slidably connected into the corresponding sliding groove one 32 and the sliding groove two 34.

[0044] Embodiment two: in order to solve the problem that the patient's lower limbs are not conveniently exercised in stages in embodiment one, the following technical scheme is provided, specifically, two groups of adjustable leg lifting mechanisms are installed on the chair frame 4, and the adjustable leg lifting mechanism comprises the connecting plate 7 for supporting the patient's legs.

[0045] The adjustable leg lifting mechanism further comprises the supporting rod 11 axially connected to the lower surface of the chair frame 4, the supporting plate 5 fixedly connected to the front side of the supporting rod 11, the connecting plate 7 axially connected to the upper end of the front side of the supporting plate 5, the gas bag 6 provided between the lower end of the front side of the supporting plate 5 and the connecting plate 7, the gas supply ball 9 connected to the gas supply pipe 8 and connected to the armrest of the chair frame 4, the treading plate 10 axially connected to the supporting rod 11, the triangular block provided on the rear side of the supporting rod 11, and the triangular block in sliding contact with the end of the angle lever 14.

[0046] According to the adjustable leg lifting mechanism, the patient's lower limbs can be conveniently exercised in stages. Figure 1, the patient can squeeze the gas supply ball 9 to supply gas into the air bag 6 through the gas supply pipe 8 (a valve is arranged on the gas supply pipe 8 to realize one-way gas supply, and the valve can be controlled to release the gas in the gas supply ball 9, and the structure is similar to that of a sphygmomanometer), thereby adjusting the angle of the connecting plate 7 relative to the support plate 5, so that the lower limbs of the patient can be exercised in stages, for example, from the natural position of the lower limbs to a 5° angle, and when the patient is adapted to the 5° angle from the natural position, the gas supply ball 9 is squeezed again to make the lower limbs rotate from the 5° angle to a 10° angle, and so on, so as to realize the exercise in stages.

[0047] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0048] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A wheelchair for limb rehabilitation, comprising two support arms (1) and a shaft (15) with bearings passing through its upper end, characterized in that: Each of the support arms (1) is fixedly connected to an n-shaped support frame (12) at its upper end, and the upper surfaces of the two support frames (12) support a chair frame (4). Both ends of the shaft (15) are fixedly connected to rear support wheels (3), and the shaft (15) bearing passes through the protrusion on the lower surface of the chair frame (4). The lower end of the support arm (1) is connected to a front support wheel (2). The shaft (15) is also set to pass through the support frame (12), and an adjustable swing mechanism is provided on the part of the shaft (15) inside the support frame (12). Two sets of adjustable leg-raising mechanisms are installed on the chair frame (4), and the adjustable leg-raising mechanism includes a connecting plate (7) for supporting the patient's legs. The adjustable swing mechanism is connected by a top press machine. The structure is connected to the connecting plate (7), and the pressing mechanism includes a bend rod (14) provided on each support arm (1). The bend rod (14) is connected to the corresponding support arm (1) shaft. The adjustable swing mechanism includes a swing ring (16) sleeved on the outside of the shaft (15), and the swing ring (16) is connected to the corresponding position shaft of the shaft (15) to facilitate the swing ring (16) swinging on the outside of the shaft (15). The lower end of the support frame (12) is limited to the movable plate (18), and the lower end of the support frame (12) is also fixedly connected to the limiting sleeve plate (19). The limiting sleeve plate (19) is sleeved on the outside of the corresponding movable plate (18), and the upper surface of the movable plate (18) is equipped with a swing ball assembly (2). 7), the shaft end bearing of the swing ball assembly (27) passes through the movable plate (18), and the ball end of the swing ball assembly (27) is engaged and slidably connected to the outside of the swing ring (16). The adjustable swing mechanism also includes an adjusting ring (17) sleeved on the outside of the shaft (15), and the adjusting ring (17) and the swing ring (16) are arranged in a one-to-one correspondence. The inner side of the adjusting ring (17) is connected to the outer side of the shaft (15) through a sliding structure. The sliding structure includes a strip groove set on the outside of the shaft (15). The sliding structure also includes a protrusion fixedly connected to the inner side of the adjusting ring (17). The protrusion is slidably connected to the strip groove to limit the adjusting ring (17) and ensure that it rotates synchronously with the shaft (15). The support frame (12) A connector (25) is fixedly connected to the upper inner side of the ring (16), and a limit rod (24) is fixedly connected to the connector (25). A threaded rod (29) is sleeved on the outer side of the limit rod (24). A rolling wheel (22) is bearing on the outer side of one end of the threaded rod (29), and the rolling wheel (22) is limited and rolled to the outer side of the adjusting ring (17). A threaded tube (23) is threadedly connected to the outer side of the other end of the threaded rod (29), and the bearing of the other end of the threaded tube (23) passes through the corresponding support frame (12). An adjusting arm (36) is provided between the swing ring (16) and the corresponding adjusting ring (17), and the two ends of the adjusting arm (36) are respectively connected to the shafts of the swing ring (16) and the adjusting ring (17).

2. The wheelchair for limb rehabilitation according to claim 1, characterized in that: The adjustable leg lifting mechanism also includes a support rod (11) that is shaft-connected to the lower surface of the chair frame (4), and a support plate (5) is fixedly connected to the front side of the support rod (11). The connecting plate (7) is shaft-connected to the upper end of the front side of the support plate (5), and an airbag (6) is provided between the lower end of the front side of the support plate (5) and the connecting plate (7). An air supply balloon (9) is connected to the airbag (6) through an air supply pipe (8), and the air supply balloon (9) is connected to the armrest of the chair frame (4). A foot pedal (10) is also shaft-connected to the support rod (11).

3. The wheelchair for limb rehabilitation according to claim 2, characterized in that: The rear side of the support rod (11) is provided with a triangular block, and the triangular block is slidably connected to the end of the angled rod (14).

4. A wheelchair for limb rehabilitation according to claim 3, characterized in that: The armrest of the chair frame (4) is fixedly connected to a support member (35), and an adjustment plate (13) is connected to the support member (35) by a bearing. The adjustment plate (13) is connected to the other end of the threaded tube (23) through a belt drive structure (28). A structural cover (26) is provided between the support arm (1) and the adjustment plate (13) and sleeved on the outside of the belt drive structure (28).

5. A wheelchair for limb rehabilitation according to claim 4, characterized in that: The threaded rod (29) is a tubular structure with an outer circle and an inner square. The limiting rod (24) is prismatic, and the square structure on the inner side of the threaded rod (29) matches the prismatic limiting rod (24) to limit the threaded rod (29) and prevent it from rotating.

6. A wheelchair for limb rehabilitation according to claim 5, characterized in that: The inner side of the swing ring (16) has a straight groove structure, and the position of the swing ring (16) on the shaft (15) is similar to the structure of the inner side of the swing ring (16).

7. A wheelchair for limb rehabilitation according to claim 6, characterized in that: The top pressing mechanism also includes a through groove (20) that runs through both sides of the movable plate (18), and a guide frame (21) is provided through the through groove (20). A connecting arm (30) is fixedly connected to the guide frame (21), and two sliders (31) and (33) are fixedly connected to the two ends of the connecting arm (30). Slide groove (32) and slide groove (34) are provided on the support arm (1) and the angle rod (14), and sliders (31) and (33) are slidably connected in the corresponding slide grooves (32) and (34).

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