Transmission structure for trolley

Abstract

The utility model discloses a transmission structure for a trolley, and solves the technical problem that the technical requirements of manufacturers and installers are higher due to the fact that the conventional transmission structure for the trolley is required to have higher manufacturing precision and installation precision. Comprising a double-hole connecting piece rotationally arranged on a trolley driving wheel, a transmission rod B connected with the double-hole connecting piece and rotationally arranged at the bottom of a trolley body, a transmission rod A and a transmission rod C which are fixedly arranged at the two ends of the trolley body correspondingly and connected with the transmission rod B correspondingly, and a first transmission mechanism arranged between the transmission rod B and the transmission rod A; and the second transmission mechanism is arranged between the transmission rod B and the transmission rod C. Based on the transmission principle of the transmission structure, the transmission structure of the utility model has lower requirements on the accuracy during manufacturing and mounting, and during manufacturing and mounting, compared with the transmission structure on the existing trolley, the transmission structure of the utility model has higher tolerance on errors and lower technical requirements on manufacturing personnel and mounting personnel.

Description

TECHNICAL FIELD

[0001] The utility model discloses electric trolley technical field, specifically related to a trolley transmission structure. BACKGROUND

[0002] Transmission structure is the important component in the trolley structure, and the power transmission structure transmits power, and the power machine delivers power to the trolley driving wheel, and the power transmission structure transmits power from the trolley driving wheel to the trolley body, so that the whole trolley can move, and the two driving wheels on the trolley support the trolley body during the movement of the trolley, and the friction of the movement of the trolley is reduced. The transmission mode on the existing trolley is usually chain transmission or gear transmission, and the chain transmission or gear transmission requires that the corresponding structure has high manufacturing precision and installation precision, the allowable error during manufacturing and installation is small, and the technical requirements of the manufacturing personnel and the installation personnel are high, and the corresponding technical training of the manufacturing personnel and the installation personnel is time-consuming and energy-consuming. UTILITY MODEL CONTENTS

[0003] The utility model discloses electric trolley technical field, specifically related to a trolley transmission structure.

[0004] To achieve the above object, the utility model adopts the technical scheme as follows:

[0005] A trolley transmission structure, including the double hole connecting piece of rotation being arranged on the trolley driving wheel, with double hole connecting piece and the transmission rod B of rotation being arranged at the bottom of trolley body, respectively fixed transmission rod A and transmission rod C being arranged at the both ends of trolley body and being connected with transmission rod B respectively, first transmission mechanism being arranged between transmission rod B and transmission rod A, and second transmission mechanism being arranged between transmission rod B and transmission rod C, trolley driven wheel is arranged on transmission rod C and is close to the ground.

[0006] Further, the first pull rod is rotatably connected between the double-hole connecting piece and the transmission rod B, one end of the first pull rod is provided with a first hook portion, the first hook portion is movably arranged on the double-hole connecting piece, and the other end of the first pull rod is rotatably connected to the transmission rod B.

[0007] Further, the first connecting member is rotatably arranged on the transmission rod B, and the other end of the first pull rod is connected to the first connecting member.

[0008] Further, the first connecting member includes two first connecting plates rotatably arranged on the transmission rod B, and a first connecting block rotatably arranged between the two first connecting plates, and the other end of the first pull rod is fixedly arranged in the first connecting block.

[0009] Further, the first transmission mechanism comprises two second connecting members rotatably arranged on two ends of the transmission rod A, two third connecting members rotatably arranged on two ends of the transmission rod B, and a push rod connected between the second connecting members and the third connecting members.

[0010] Further, the second connecting member comprises a second connecting plate rotatably arranged on the transmission rod A, and one end of the push rod is provided with a second hook portion movably arranged on the second connecting plate.

[0011] The third connecting member comprises two third connecting plates rotatably arranged on the transmission rod B, and a third connecting block rotatably arranged between the two third connecting plates; and the other end of the push rod is fixedly arranged on the third connecting block.

[0012] Further, the second transmission mechanism comprises two fourth connecting members rotatably arranged on the transmission rod B, two fifth connecting members rotatably arranged on the transmission rod C, and a second pull rod connected between the fourth connecting members and the fifth connecting members.

[0013] Further, the fourth connecting member comprises a main connecting plate and an auxiliary connecting plate rotatably arranged on the transmission rod B and connected with each other, and one end of the second pull rod is provided with a third hook portion movably arranged on the main connecting plate.

[0014] The fifth connecting member comprises two fifth connecting plates rotatably arranged on the transmission rod C, and a fifth connecting block rotatably arranged between the two fifth connecting plates; and the other end of the second pull rod is fixedly arranged on the fifth connecting block.

[0015] Compared with the prior art, the utility model has the advantages of the following:

[0016] The utility model discloses simple structure, scientific and reasonable in design, convenient to use, the utility model discloses transmission structure adopts double first pull rod and transmits the power to transmission rod B with the dolly driving wheel, adopts double push rod and transmits the power to transmission rod A with transmission rod B, adopts double second pull rod and transmits the power to transmission rod C with transmission rod B, and then via transmission rod A and transmission rod C, power is transmitted to the dolly car body, so that the dolly car body can stably travel, based on the transmission principle of the utility model, the transmission structure of the utility model has lower precision requirement when making and installing, compared with the prior art dolly transmission structure, the utility model has greater error tolerance, and the technical requirement of the manufacturing personnel and the installation personnel is lower. ACCURACY

[0017] Figure 1 It is the structure schematic diagram of the utility model.

[0018] Figure 2 It is the schematic view of the first hook portion on the first pull rod.

[0019] Figure 3 is a schematic view of the second hook portion on the push rod.

[0020] Figure 4 is a schematic view of the third hook portion on the second pull rod.

[0021] Wherein, the name corresponding to the reference sign is:

[0022] 1-bifurcated connecting piece, 2-transmission rod B, 3-transmission rod A, 4-transmission rod C, 5-first pull rod, 6-first hook portion, 7-first connecting piece, 8-second connecting piece, 9-third connecting piece, 10-push rod, 11-fourth connecting piece, 12-fifth connecting piece, 13-second pull rod, 14-first connecting plate, 15-first connecting block, 16-second connecting plate, 17-second hook portion, 18-third connecting block, 19-main connecting plate, 20-assistant connecting plate, 21-third hook portion, 22-fifth connecting plate, 23-fifth connecting block, 24-third connecting plate, 25-mounting plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0024] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore it cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; of course, it can also be mechanical connection, or electrical connection; in addition, it can also be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] Embodiment 1

[0027] As Figures 1-4 shown, the utility model provides a trolley transmission structure, including two hole connecting piece 1 of rotation of trolley drive wheel, with two hole connecting piece 1 is connected and is rotationally arranged in the bottom of trolley body transmission rod B2, respectively fixedly arranged in the both ends of trolley body, and transmission rod A3 and transmission rod C4 are connected with transmission rod B2 respectively, first transmission mechanism arranged between transmission rod B2 and transmission rod A3, and second transmission mechanism arranged between transmission rod B2 and transmission rod C4, trolley driven wheel is arranged on transmission rod C4 and is close to the ground.

[0028] The utility model discloses simple structure, scientific and reasonable in design, convenient to use, the utility model discloses transmission structure adopts double first pull rod and transmits trolley drive wheel power to transmission rod B, adopts double push rod and transmits transmission rod B power to transmission rod A, adopts double second pull rod and transmits transmission rod B power to transmission rod C, and then power is transmitted to trolley body via transmission rod A and transmission rod C, so that trolley body can travel stably, based on the transmission principle of the utility model, the precision requirement of the utility model transmission structure when making and installing is lower, compared with the prior art trolley transmission structure, the utility model has greater tolerance to error, and the technical requirement of the manufacturing personnel and installation personnel is lower.

[0029] Two hole connecting piece 1 has two, and two two hole connecting pieces 1 are rotationally arranged on two trolley drive wheels respectively.

[0030] Transmission rod C4 is equipped with mounting plate 25 for installing trolley driven wheel.

[0031] Embodiment 2

[0032] As Figures 1-4 shown, the utility model provides a trolley transmission structure, including two hole connecting piece 1 of rotation of trolley drive wheel, with two hole connecting piece 1 is connected and is rotationally arranged in the bottom of trolley body transmission rod B2, respectively fixedly arranged in the both ends of trolley body, and transmission rod A3 and transmission rod C4 are connected with transmission rod B2 respectively, first transmission mechanism arranged between transmission rod B2 and transmission rod A3, and second transmission mechanism arranged between transmission rod B2 and transmission rod C4, trolley driven wheel is arranged on transmission rod C4 and is close to the ground.

[0033] First pull rod 5 is rotationally connected between two hole connecting piece 1 and transmission rod B2, one end of first pull rod 5 is equipped with first hook portion 6, first hook portion 6 is movably arranged on two hole connecting piece 1, and the other end of first pull rod 5 is rotationally connected to transmission rod B2.

[0034] In the embodiment 2, the connecting rod matched with the double-hole connecting piece 1 is arranged on the trolley driving wheel, the double-hole connecting piece 1 is provided with double holes, one hole of the double-hole connecting piece 1 is movably arranged on the connecting rod, and the first hook part 6 is movably arranged in the other hole of the double-hole connecting piece 1.

[0035] The power transmission principle of the trolley driving wheel to the transmission rod B2 is that the double-hole connecting piece 1 is movably arranged on a fixed point of the trolley driving wheel, the double-hole connecting piece 1 is driven to move synchronously during the rotation of the trolley driving wheel, the first pull rod 5 is driven to move synchronously by the double-hole connecting piece 1, when the first pull rod 5 is driven to stretch forward by the double-hole connecting piece 1, the first pull rod 5 is synchronously pulled forward to drive the transmission rod B2 to move, thus, the power of the trolley driving wheel is transmitted to the transmission rod B2 through the driving of the double-hole connecting piece 1 and the first pull rod 5.

[0036] Embodiment 3

[0037] As shown in Figures 1-4 The utility model provides a transmission structure for trolley, which comprises a double-hole connecting piece 1 rotatably arranged on a trolley driving wheel, a transmission rod B2 connected with the double-hole connecting piece 1 and rotatably arranged on the bottom of a trolley body, a transmission rod A3 and a transmission rod C4 fixedly arranged at the two ends of the trolley body respectively and connected with the transmission rod B2 respectively, a first transmission mechanism arranged between the transmission rod B2 and the transmission rod A3, and a second transmission mechanism arranged between the transmission rod B2 and the transmission rod C4; a trolley driven wheel is arranged on the transmission rod C4 and closely contacts the ground.

[0038] The first pull rod 5 is rotatably connected between the double-hole connecting piece 1 and the transmission rod B2, one end of the first pull rod 5 is provided with a first hook part 6, the first hook part 6 is movably arranged on the double-hole connecting piece 1, and the other end of the first pull rod 5 is rotatably connected to the transmission rod B2.

[0039] The first connecting piece 7 is rotatably arranged on the transmission rod B2, thus, the first pull rod 5 is connected to the transmission rod B2, so that the first pull rod 5 can transmit power to the transmission rod B2, and the connection part between the first pull rod 5 and the transmission rod B2 does not affect the curve movement of the first pull rod 5.

[0040] In the embodiment 3, the first pull rod 5 is driven to move in a curve by the double-hole connecting piece 1, the first connecting piece 7 is rotatably arranged on the transmission rod B2, thus, the first pull rod 5 is connected to the transmission rod B2, so that the first pull rod 5 can transmit power to the transmission rod B2, and the connection part between the first pull rod 5 and the transmission rod B2 does not affect the curve movement of the first pull rod 5.

[0041] Embodiment 4

[0042] As shown in Figures 1-4As shown in the utility model provides a kind of transmission structure for trolley, including double-hole connecting piece 1 being rotated on trolley driving wheel, transmission rod B2 being connected with double-hole connecting piece 1 and being rotated on the bottom of trolley body, transmission rod A3 and transmission rod C4 being respectively fixedly arranged at the both ends of trolley body and being respectively connected with transmission rod B2, first transmission mechanism being arranged between transmission rod B2 and transmission rod A3, and second transmission mechanism being arranged between transmission rod B2 and transmission rod C4;Trolley driven wheel is arranged on transmission rod C4 and closely adheres to ground.

[0043] First pull rod 5 is rotatably connected between double-hole connecting piece 1 and transmission rod B2, one end of first pull rod 5 is provided with first hook part 6, first hook part 6 is movably arranged on double-hole connecting piece 1, and the other end of first pull rod 5 is rotatably connected to transmission rod B2.

[0044] First connecting piece 7 is rotatably arranged on transmission rod B2, and the other end of first pull rod 5 is connected to first connecting piece 7.

[0045] First connecting piece 7 includes two first connecting plates 14 rotatably arranged on transmission rod B2 respectively, and first connecting block 15 rotatably arranged between the two first connecting plates 14;The other end of first pull rod 5 is fixedly arranged on first connecting block 15.

[0046] In the embodiment 4, first connecting block 15 is rotatably arranged between the two first connecting plates 14, so that the connection between first pull rod 5 and the two first connecting plates 14 is ensured, and the influence of the connection between first pull rod 5 and the two first connecting plates 14 on the curve movement of first pull rod 5 is avoided.When first pull rod 5 moves in curve, the other end of first pull rod 5 can rotate around first connecting block 15 as the pivot, and can also rotate around transmission rod B2 as the pivot, so that the other end of first pull rod 5 can move correspondingly with the movement of the whole first pull rod 5, so that the power transmission from first pull rod 5 to transmission rod B2 is ensured, and the movement of first pull rod 5 is not hindered by first connecting piece 7 and transmission rod B2.

[0047] Embodiment 5

[0048] As Figures 1-4 shown, the utility model provides a kind of transmission structure for trolley, including double-hole connecting piece 1 being rotated on trolley driving wheel, transmission rod B2 being connected with double-hole connecting piece 1 and being rotated on the bottom of trolley body, transmission rod A3 and transmission rod C4 being respectively fixedly arranged at the both ends of trolley body and being respectively connected with transmission rod B2, first transmission mechanism being arranged between transmission rod B2 and transmission rod A3, and second transmission mechanism being arranged between transmission rod B2 and transmission rod C4;Trolley driven wheel is arranged on transmission rod C4 and closely adheres to ground.

[0049] The first transmission mechanism comprises two second connecting pieces 8 rotatably arranged on two ends of the transmission rod A3, two third connecting pieces 9 rotatably arranged on two ends of the transmission rod B2, and a push rod 10 connected between the second connecting pieces 8 and the third connecting pieces 9.

[0050] In the embodiment 5, when the first pull rod 5 is driven by the trolley driving wheel to pull the transmission rod B2 forward, the transmission rod B2 pushes the push rod 10 forward, the push rod 10 drives the transmission rod A3 to move forward, and then the power is transmitted to the front end of the trolley body, so that the front end of the trolley body is driven to move forward.

[0051] Embodiment 6

[0052] As shown in Figures 1-4 The utility model provides a trolley transmission structure, which comprises a double-hole connecting piece 1 rotatably arranged on a trolley driving wheel, a transmission rod B2 connected with the double-hole connecting piece 1 and rotatably arranged at the bottom of a trolley body, a transmission rod A3 and a transmission rod C4 fixedly arranged at two ends of the trolley body and connected with the transmission rod B2 respectively, a first transmission mechanism arranged between the transmission rod B2 and the transmission rod A3, and a second transmission mechanism arranged between the transmission rod B2 and the transmission rod C4; a trolley driven wheel is arranged on the transmission rod C4 and closely contacts the ground.

[0053] The first transmission mechanism comprises two second connecting pieces 8 rotatably arranged on two ends of the transmission rod A3, two third connecting pieces 9 rotatably arranged on two ends of the transmission rod B2, and a push rod 10 connected between the second connecting pieces 8 and the third connecting pieces 9.

[0054] The second connecting piece 8 comprises a second connecting plate 16 rotatably arranged on the transmission rod A3, and one end of the push rod 10 is provided with a second hook portion 17 which is movably arranged on the second connecting plate 16.

[0055] The third connecting piece 9 comprises two third connecting plates 24 rotatably arranged on the transmission rod B2, and a third connecting block 18 rotatably arranged between the two third connecting plates 24; the other end of the push rod 10 is fixedly arranged on the third connecting block 18.

[0056] In the embodiment 6, the transmission rod B2 transmits power to the push rod 10 through the third connecting piece 9, and the push rod 10 transmits power to the transmission rod A3 through the second connecting piece 8.

[0057] Embodiment 7

[0058] As shown in Figures 1-4As shown in the utility model provides a kind of transmission structure for dolly, including double-hole connecting piece 1 being rotatably arranged on dolly driving wheel, transmission rod B2 being rotatably arranged on the bottom of dolly body and being connected with double-hole connecting piece 1, transmission rod A3 and transmission rod C4 being respectively fixedly arranged on the both ends of dolly body and being connected with transmission rod B2, first transmission mechanism being arranged between transmission rod B2 and transmission rod A3, and second transmission mechanism being arranged between transmission rod B2 and transmission rod C4;Dolly driven wheel is arranged on transmission rod C4 and closely adheres to ground.

[0059] Second transmission mechanism includes two fourth connecting pieces 11 being rotatably arranged on transmission rod B2 respectively, two fifth connecting pieces 12 being rotatably arranged on transmission rod C4 respectively, and second pull rod 13 being arranged and connected between fourth connecting piece 11 and fifth connecting piece 12.

[0060] In the embodiment 7, when first pull rod 5 is pulled forward synchronously under the driving of dolly driving wheel, transmission rod B2 pulls second pull rod 13 forward synchronously, and second pull rod 13 drives transmission rod C4 to move forward, and then power is transmitted to the rear end of dolly body, so that the rear end of dolly body can move forward under the driving of power.

[0061] The process that push rod 10 drives transmission rod A3 to move forward and second pull rod 13 drives transmission rod C4 to move forward is carried out synchronously, so that the whole dolly body moves forward. During the forward movement of dolly, dolly driving wheel and dolly driven wheel support the whole dolly, and dolly driving wheel and dolly driven wheel roll forward synchronously, so that the friction of dolly on ground is reduced.

[0062] Embodiment 8

[0063] As Figures 1-4 shown, the utility model provides a kind of transmission structure for dolly, including double-hole connecting piece 1 being rotatably arranged on dolly driving wheel, transmission rod B2 being rotatably arranged on the bottom of dolly body and being connected with double-hole connecting piece 1, transmission rod A3 and transmission rod C4 being respectively fixedly arranged on the both ends of dolly body and being connected with transmission rod B2, first transmission mechanism being arranged between transmission rod B2 and transmission rod A3, and second transmission mechanism being arranged between transmission rod B2 and transmission rod C4;Dolly driven wheel is arranged on transmission rod C4 and closely adheres to ground.

[0064] Second transmission mechanism includes two fourth connecting pieces 11 being rotatably arranged on transmission rod B2 respectively, two fifth connecting pieces 12 being rotatably arranged on transmission rod C4 respectively, and second pull rod 13 being arranged and connected between fourth connecting piece 11 and fifth connecting piece 12.

[0065] The fourth connecting piece 11 comprises a main connecting plate 19 and an auxiliary connecting plate 20 which are rotatably arranged on the transmission rod B2 and are connected with each other, and the third hook part 21 is movably arranged on one end of the second pull rod 13 and is movably arranged on the main connecting plate 19.

[0066] The fifth connecting piece 12 comprises two fifth connecting plates 22 which are rotatably arranged on the transmission rod C4, and a fifth connecting block 23 which is rotatably arranged between the two fifth connecting plates 22, and the other end of the second pull rod 13 is movably arranged on the fifth connecting block 23.

[0067] In the eighth embodiment, the transmission rod B2 transmits power to the second pull rod 13 through the fourth connecting piece 11, and the second pull rod 13 transmits power to the transmission rod C4 through the fifth connecting piece 12.

[0068] Finally, it should be noted that: the above embodiments are only the preferred embodiments of the utility model for describing the technical scheme of the utility model, but not limit it, of course, it is not the patent range of the utility model; although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the range of the technical scheme of the embodiments of the utility model; that is to say, but whatever the substantive meaning of the modification or polishing made in the main design idea and spirit of the utility model, the technical problem solved is still consistent with the utility model, and it should be included in the protection range of the utility model; in addition, the technical scheme of the utility model is directly or indirectly used in other related technical fields, which is also included in the patent protection range of the utility model.

Claims

1. A transmission structure for a trolley, characterized in that: The invention comprises a double-hole connecting piece (1) rotatably arranged on the driving wheel of the trolley, a transmission rod B (2) connected to the double-hole connecting piece (1) and rotatably arranged on the bottom of the trolley body, a transmission rod A (3) and a transmission rod C (4) respectively fixedly arranged at both ends of the trolley body and respectively connected to the transmission rod B (2), a first transmission mechanism arranged between the transmission rod B (2) and the transmission rod A (3), and a second transmission mechanism arranged between the transmission rod B (2) and the transmission rod C (4); the driven wheel of the trolley is arranged on the transmission rod C (4) and is close to the ground.

2. A transmission structure for a trolley according to claim 1, characterized in that: A first pull rod (5) is rotatably connected between the double-hole connecting piece (1) and the transmission rod B (2). A first hook (6) is provided on one end of the first pull rod (5). The first hook (6) is movably inserted into the double-hole connecting piece (1). The other end of the first pull rod (5) is rotatably connected to the transmission rod B (2).

3. A transmission structure for a trolley according to claim 2, characterized in that: A first connecting piece (7) is rotatably provided on the transmission rod B (2), and the other end of the first pull rod (5) is connected to the first connecting piece (7).

4. A transmission structure for a trolley according to claim 3, characterized in that: The first connecting member (7) includes two first connecting plates (14) rotatably mounted on the transmission rod B (2) and a first connecting block (15) rotatably mounted between the two first connecting plates (14); the other end of the first pull rod (5) is fixedly mounted on the first connecting block (15).

5. The transmission structure for a trolley according to claim 1, characterized in that: The first transmission mechanism comprises two second connecting members (8) rotatably arranged at both ends of a transmission rod A (3), two third connecting members (9) rotatably arranged at both ends of a transmission rod B (2), and a push rod (10) connected between the second connecting members (8) and the third connecting members (9).

6. The transmission structure for a trolley according to claim 5, characterized in that: The second connecting member (8) includes a second connecting plate (16) rotatably mounted on the transmission rod A (3); one end of the push rod (10) is provided with a second hook (17), and the second hook (17) is movably mounted on the second connecting plate (16); The third connecting member (9) includes two third connecting plates (24) rotatably arranged on the transmission rod B (2) and a third connecting block (18) rotatably arranged between the two third connecting plates (24); the other end of the push rod (10) is fixedly inserted into the third connecting block (18).

7. The transmission structure for a trolley according to claim 1, characterized in that: The second transmission mechanism includes two fourth connecting members (11) respectively rotatably arranged on the transmission rod B (2), two fifth connecting members (12) respectively rotatably arranged on the transmission rod C (4), and a second pull rod (13) connected between the fourth connecting member (11) and the fifth connecting member (12).

8. The transmission structure for a trolley according to claim 7, characterized in that: The fourth connecting member (11) includes a main connecting plate (19) and an auxiliary connecting plate (20) which are respectively rotatably arranged on the transmission rod B (2) and connected to each other. A third hook (21) is provided on one end of the second pull rod (13), and the third hook (21) is movably arranged on the main connecting plate (19). The fifth connecting member (12) includes two fifth connecting plates (22) rotatably mounted on the transmission rod C (4) and a fifth connecting block (23) rotatably mounted between the two fifth connecting plates (22). The other end of the second pull rod (13) is fixedly mounted on the fifth connecting block (23).

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