Quantitative oil injection device for working rollers between grinding rollers of hot rolled plate strip

Abstract

The invention belongs to the technical field of oiling devices, and discloses a quantitative oiling device for working rollers between grinding rollers of a hot rolled plate strip, which comprises a bottom plate, and a base is fixedly mounted on the left side of the top of the bottom plate. By arranging the hydraulic cylinder, the displacement sensor, the piston and the oil inlet one-way valve, when the piston ascends, the oil inlet one-way valve is opened, and the oil outlet one-way valve is closed, lubricating oil in the oil drum can enter the cavity through the connecting pipe and the oil inlet one-way valve, and when the piston descends, the oil outlet one-way valve is opened, and the oil inlet one-way valve is closed; the electric appliance cabinet controls the oil pumping speed of the oil pumping pipe by controlling the size of an opening of the proportional valve, the vertical movement speed of the piston is adjusted, the position of the piston is fed back through the displacement sensor, and therefore the stroke length of the piston is set. And quantitative oil injection to the hydraulic cylinder is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of oil injection devices, and particularly relates to a quantitative oil injection device for work rolls in a hot rolling strip grinding mill. Background Art

[0002] Hot rolled plates refer to steel plates with a width greater than or equal to 600 mm and a thickness of 0.35 - 200 mm, and steel strips with a thickness of 1.2 - 25 mm. The products of hot continuous rolling steel plates include steel strips (coils) and steel plates sheared therefrom, and the steel strips (coils) can be divided into straight cut coils and finished coils (split coils, leveled coils, and longitudinally cut coils).

[0003] The bearing seats of the work rolls for rolling strip need to ensure the lubrication performance of the bearings inside the bearing seats during the rolling process. All bearing seats need to be oiled in the grinding mill, and an oil injection device is required for oiling the bearing seats. The existing oil injection devices generally use plunger oil injection machines. Although this kind of oil injection machine can achieve the basic oil injection function, due to the small diameter and short stroke of the plunger of this plunger oil injection pump, the oil injection time is long, which affects the production efficiency. And because the oil injection pump does not display the oil injection volume, oil often overflows, which not only causes serious waste of oil, but also will make the bearing seats and the frame full of oil in the long run, increasing the difficulty of lean management. Therefore, it needs to be improved. Summary of the Invention

[0004] The purpose of the invention is to provide a quantitative oil injection device for work rolls in a hot rolling strip grinding mill to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the invention provides the following technical solutions: A quantitative oil injection device for work rolls in a hot rolling strip grinding mill, comprising:

[0006] A bottom plate, on the left side of the top of which a base is fixedly installed. An oil barrel is movably connected to the top of the base, and a pressing plate is movably sleeved on the top of the inner cavity of the oil barrel;

[0007] An oil injection mechanism, which is arranged on the top of the pressing plate;

[0008] Among them, the oil injection mechanism includes a transition sleeve, the bottom of which is fixedly connected to the top of the pressing plate. The top of the transition sleeve is fixedly connected to an oil storage cylinder, a cavity is opened inside the oil storage cylinder, a hydraulic cylinder is fixedly connected to the top of the oil storage cylinder, a displacement sensor is fixedly installed inside the bottom end of the hydraulic cylinder, a buckle is movably sleeved on the outer surface of the bottom end of the hydraulic cylinder, the bottom end of the buckle is fixedly connected to a piston, a sealing ring is movably sleeved on the outer surface of the piston, and the outer surfaces of the piston and the sealing ring are both movably connected to the inner surface of the cavity. When the hydraulic cylinder starts, it will drive the buckle to move;

[0009] Connecting mechanism, which is arranged inside the transition sleeve.

[0010] Preferably, the connecting mechanism includes:

[0011] An oil inlet check valve, the outer surface of which is fixedly sleeved with the inner wall of the oil storage cylinder. The bottom end of the oil inlet check valve penetrates through the oil storage cylinder and extends into the interior of the transition sleeve. A connecting pipe is fixedly sleeved inside the oil inlet check valve. The bottom end of the connecting pipe penetrates through the transition sleeve and extends into the interior of the pressing plate. A sealing gasket is fixedly sleeved on the outer surface of the connecting pipe, and the outer surface of the sealing gasket is fixedly sleeved with the inner wall of the transition sleeve. A hose is fixedly sleeved at the bottom end of the connecting pipe;

[0012] An oil outlet check valve, the outer surface of which is fixedly sleeved with the inner wall of the oil storage cylinder. The bottom end of the oil outlet check valve penetrates through the oil storage cylinder and extends into the interior of the transition sleeve. An oil outlet pipe is fixedly sleeved inside the oil outlet check valve.

[0013] Preferably, a first pneumatic cylinder is fixedly installed on the top of the base on the left and right sides of the oil barrel. The top end of the first pneumatic cylinder is fixedly sleeved with a mounting plate. A connecting rod is fixedly sleeved inside the mounting plate. The bottom end of the connecting rod is fixedly connected to the top of the pressing plate. A fixing rod is fixedly connected to the back of the first pneumatic cylinder.

[0014] Preferably, an electrical cabinet is fixedly installed on the right side of the top of the bottom plate. A first electric wire is fixedly connected to the left side of the electrical cabinet, and the other end of the first electric wire is fixedly connected to the top of the hydraulic cylinder.

[0015] Preferably, a hydraulic station is fixedly installed on the top of the bottom plate on the left side of the electrical cabinet. An oil pump is fixedly installed on the top of the hydraulic station. The bottom end of the oil pump is fixedly connected to a proportional valve, and the bottom end of the proportional valve is fixedly connected to an oil suction pipe.

[0016] Preferably, an injection pipe is fixedly connected to the left side of the oil pump. The other end of the injection pipe is fixedly connected to the bottom of the right side of the hydraulic cylinder. A second electric wire is fixedly connected to the right side of the oil pump, and the right end of the second electric wire is fixedly connected to the left side of the electrical cabinet. A return pipe is fixedly sleeved on the top of the hydraulic station, and the other end of the return pipe is fixedly connected to the top of the right side of the hydraulic cylinder.

[0017] Preferably, sliding grooves are formed on the front and back sides inside the base, and sliders are movably installed inside the sliding grooves.

[0018] Preferably, a clamping block is fixedly connected to the top of the slider. The outer surface of the clamping block is movably connected to the top of the base. A connecting block is fixedly connected to the left end of the clamping block.

[0019] Preferably, a support plate is fixedly installed on the left side of the top of the base. The top of the inner surface of the support plate is fixedly installed with a second air cylinder. The bottom end of the second air cylinder is fixedly connected with a lifting plate. The bottom end of the lifting plate is hinged with a hinged rod, and the bottom end of the hinged rod is hinged with the left side of the connecting block.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. By setting a hydraulic cylinder, a displacement sensor, a piston and an oil inlet check valve, when the piston rises, the oil inlet check valve opens and the oil outlet check valve closes, so that the lubricating oil inside the oil barrel enters the inside of the cavity through the connecting pipe and the oil inlet check valve. When the piston descends, the oil outlet check valve opens and the oil inlet check valve closes, so that the lubricating oil is discharged through the oil outlet check valve and the oil outlet pipe, thus realizing automatic oil injection. The electrical cabinet controls the size of the opening of the proportional valve, thereby controlling the oil pumping speed of the oil suction pipe, and then adjusting the up and down movement speed of the piston. Then, the position of the piston is fed back by the displacement sensor, so as to set the stroke length of the piston and realize quantitative oil injection into the hydraulic cylinder. By testing the oil injection amount of the work roll on site, the highest position of the piston is determined, and thus the purpose of quantitatively injecting oil into the work roll can be achieved.

[0022] 2. By setting clamping blocks, a second air cylinder, a lifting plate and a hinged rod, when an operator places the oil barrel between the two clamping blocks, the second air cylinder can be started to pull the lifting plate upward, so that the lifting plate drives the hinged rod to move, and then the hinged rod drives the two connecting blocks to move towards each other, so that the two clamping blocks can move towards each other, and thus the oil barrel can be clamped and fixed to prevent the oil barrel from shaking when extracting lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is a front cross-sectional structural diagram of the present invention;

[0025] Figure 3 is a side cross-sectional structural diagram of the present invention;

[0026] Figure 4 is a cross-sectional structural diagram of the connecting block of the present invention;

[0027] Figure 5 is a rear structural diagram of the present invention;

[0028] Figure 6 is Figure 2 a partial enlarged structural diagram at A in

[0029] Figure 7 isFigure 2 Schematic diagram of the partial enlarged structure at position B in the [device].

[0030] In the figure: 1, bottom plate; 2, base; 3, oil barrel; 4, pressing plate; 5, transition sleeve; 6, oil storage cylinder; 7, displacement sensor; 8, hydraulic cylinder; 9, buckle; 10, piston; 11, sealing ring; 12, inlet check valve; 13, connecting pipe; 14, gasket; 15, hose; 16, outlet check valve; 17, outlet pipe; 18, first air cylinder; 19, mounting plate; 20, connecting rod; 21, fixed rod; 22, electrical cabinet; 23, first wire; 24, hydraulic station; 25, oil pump; 26, proportional valve; 27, suction pipe; 28, injection pipe; 29, second wire; 30, return pipe; 31, chute; 32, slider; 33, clamping block; 34, connecting block; 35, support plate; 36, second air cylinder; 37, lifting plate; 38, hinge rod; 39, cavity. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] As Figures 1 to 7 shown, the embodiment of the present invention provides a quantitative oil injection device for a working roll in a hot rolling strip grinding mill, including:

[0033] A bottom plate 1, a base 2 is fixedly installed on the left side of the top of the bottom plate 1, an oil barrel 3 is movably connected to the top of the base 2, and a pressing plate 4 is movably sleeved on the top of the inner cavity of the oil barrel 3;

[0034] An oil injection mechanism, which is arranged on the top of the pressing plate 4;

[0035] Among them, the oil injection mechanism includes a transition sleeve 5, the bottom of the transition sleeve 5 is fixedly connected to the top of the pressing plate 4, the top end of the transition sleeve 5 is fixedly connected to an oil storage cylinder 6, a cavity 39 is opened inside the oil storage cylinder 6, a hydraulic cylinder 8 is fixedly connected to the top of the oil storage cylinder 6, a displacement sensor 7 is fixedly installed inside the bottom end of the hydraulic cylinder 8, a buckle 9 is movably sleeved on the outer surface of the bottom end of the hydraulic cylinder 8, the bottom end of the buckle 9 is fixedly connected to a piston 10, a sealing ring 11 is movably sleeved on the outer surface of the piston 10, and the outer surfaces of the piston 10 and the sealing ring 11 are both movably connected to the inner surface of the cavity 39. When the hydraulic cylinder 8 is started, it will drive the buckle 9 to move;

[0036] A connection mechanism, which is arranged inside the transition sleeve 5.

[0037] Due to the design of the sealing ring 11, a sealed space can be formed inside the cavity 39. When the hydraulic cylinder 8 is activated, it will drive the buckle 9 and the piston 10 to move downward, thereby reducing the sealed space inside the cavity 39, and then the oil injection work can be carried out. When the hydraulic cylinder 8 drives the buckle 9 and the piston 10 to rise, the sealed space inside the cavity 39 will increase, so that the lubricating oil can be sucked into the cavity 39.

[0038] Among them, the connection mechanism includes:

[0039] An inlet check valve 12, the outer surface of the inlet check valve 12 is fixedly sleeved with the inner wall of the oil storage cylinder 6, the bottom end of the inlet check valve 12 penetrates through the oil storage cylinder 6 and extends into the inside of the transition sleeve 5, a connecting pipe 13 is fixedly sleeved inside the inlet check valve 12, the bottom end of the connecting pipe 13 penetrates through the transition sleeve 5 and extends into the inside of the pressing plate 4, a sealing gasket 14 is fixedly sleeved on the outer surface of the connecting pipe 13, the outer surface of the sealing gasket 14 is fixedly sleeved with the inner wall of the transition sleeve 5, and a hose 15 is fixedly sleeved at the bottom end of the connecting pipe 13;

[0040] An outlet check valve 16, the outer surface of the outlet check valve 16 is fixedly sleeved with the inner wall of the oil storage cylinder 6, the bottom end of the outlet check valve 16 penetrates through the oil storage cylinder 6 and extends into the inside of the transition sleeve 5, and an outlet pipe 17 is fixedly sleeved inside the outlet check valve 16.

[0041] Through the inlet check valve 12 and the outlet check valve 16, the lubricating oil will enter the inside of the cavity 39 through the inlet check valve 12, and the lubricating oil inside the cavity 39 will be discharged through the outlet check valve 16.

[0042] Among them, the top of the base 2 is fixedly installed with first air cylinders 18 on the left and right sides of the oil barrel 3. The top ends of the first air cylinders 18 are fixedly sleeved with mounting plates 19. A connecting rod 20 is fixedly sleeved inside the mounting plate 19. The bottom end of the connecting rod 20 is fixedly connected to the top of the pressing plate 4. A fixing rod 21 is fixedly connected to the back of the first air cylinder 18.

[0043] By setting the first air cylinder 18, the first air cylinder 18 can pull the mounting plate 19 downward, so that the mounting plate 19 drives the connecting rod 20 to move downward, thereby enabling the pressing plate 4 to receive a downward force, so that the compressed lubricating oil can be quickly extracted.

[0044] Among them, an electric cabinet 22 is fixedly installed on the right side of the top of the bottom plate 1. The left side of the electric cabinet 22 is fixedly connected to a first electric wire 23. The other end of the first electric wire 23 is fixedly connected to the top of the hydraulic cylinder 8.

[0045] By setting the first electric wire 23, the electric cabinet 22 can accurately control the operation of the hydraulic cylinder 8.

[0046] Among them, a hydraulic station 24 located on the left side of the electrical cabinet 22 is fixedly installed on the top of the bottom plate 1. An oil pump 25 is fixedly installed on the top of the hydraulic station 24. The bottom end of the oil pump 25 is fixedly connected to a proportional valve 26. The bottom end of the proportional valve 26 is fixedly connected to an oil suction pipe 27.

[0047] Due to the design of the proportional valve 26, it is possible to adjust the movement speed of the piston 10 by controlling the opening size of the proportional valve 26.

[0048] Among them, an oil injection pipe 28 is fixedly connected to the left side of the oil pump 25. The other end of the oil injection pipe 28 is fixedly connected to the bottom of the right side of the hydraulic cylinder 8. A second electric wire 29 is fixedly connected to the right side of the oil pump 25. The right end of the second electric wire 29 is fixedly connected to the left side of the electrical cabinet 22. A return oil pipe 30 is fixedly sleeved on the top of the hydraulic station 24. The other end of the return oil pipe 30 is fixedly connected to the top of the right side of the hydraulic cylinder 8.

[0049] After the oil pump 25 is started, it will extract the oil inside the hydraulic station 24 through the oil suction pipe 27, and then inject it into the inside of the hydraulic cylinder 8 through the oil injection pipe 28.

[0050] Among them, sliding grooves 31 are opened on both the front and rear sides inside the base 2. Sliders 32 are movably installed inside the sliding grooves 31.

[0051] By setting the sliding grooves 31, the sliding grooves 31 can play a role in limiting the sliders 32.

[0052] Among them, a clamping block 33 is fixedly connected to the top of the slider 32. The outer surface of the clamping block 33 is movably connected to the top of the base 2. A connecting block 34 is fixedly connected to the left end of the clamping block 33.

[0053] When the connecting block 34 moves, it will drive the clamping block 33 to move.

[0054] Among them, a support plate 35 is fixedly installed on the left side of the top of the base 2. A second air cylinder 36 is fixedly installed on the top of the inner surface of the support plate 35. The bottom end of the second air cylinder 36 is fixedly connected to a lifting plate 37. The bottom end of the lifting plate 37 is hinged to a hinged rod 38. The bottom end of the hinged rod 38 is hinged to the left side of the connecting block 34.

[0055] When the second air cylinder 36 pushes the lifting plate 37 to move downward, the hinged rod 38 will drive the two connecting blocks 34 to move away from each other.

[0056] Working principle and usage process:

[0057] The operator places the oil barrel 3 on the upper surface of the base 2 and then starts the second pneumatic cylinder 36, causing the second pneumatic cylinder 36 to drive the lifting plate 37 upward. As a result, the lifting plate 37 can drive the articulated rod 38 to move, and then the articulated rod 38 pulls the two connecting blocks 34 to move towards each other, so that the two clamping blocks 33 can clamp and position the oil barrel 3, improving the stability of the oil barrel 3 during use and preventing the oil barrel 3 from shaking during oil pumping.

[0058] The operator can start the oil pump 25 by controlling the electrical cabinet 22. Then, the oil suction pipe 27 can suck the oil inside the hydraulic station 24 and discharge it into the inside of the hydraulic cylinder 8 through the oil injection pipe 28. The operator can control the opening size of the proportional valve 26 through the electrical cabinet 22, thereby controlling the oil pumping speed of the oil suction pipe 27, and then adjusting the up and down movement speed of the piston 10. When the oil is injected into the inside of the hydraulic cylinder 8 through the oil injection pipe 28, the hydraulic cylinder 8 will push the buckle 9 and the piston 10 to move downward inside the cavity 39, reducing the space inside the cavity 39. At this time, the oil outlet check valve 16 opens and the oil inlet check valve 12 closes, so that the lubricating oil is discharged through the oil outlet check valve 16 and the oil outlet pipe 17, realizing automatic oil injection. When the oil inside the hydraulic cylinder 8 flows back into the inside of the hydraulic station 24 through the return pipe 30, the piston 10 will rise. At this time, the oil inlet check valve 12 opens and the oil outlet check valve 16 closes, causing the lubricating oil inside the oil barrel 3 to enter the inside of the cavity 39 through the connecting pipe 13 and the oil inlet check valve 12. Due to the design of the displacement sensor 7, the displacement sensor 7 feedbacks the position of the piston 10, thereby setting the stroke length of the piston 10 to achieve quantitative oil injection. By testing the oil injection amount of the work roll on site, the highest position of the piston 10 can be determined, and thus the purpose of quantitative oil injection can be achieved.

[0059] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quantitative oil injection device for work rolls in a hot rolling strip mill, characterized in that, It includes: A bottom plate (1), on the left side of the top of the bottom plate (1), a base (2) is fixedly installed, on the top of the base (2), an oil barrel (3) is movably connected, and on the top of the inner cavity of the oil barrel (3), a pressing plate (4) is movably sleeved. An oil injection mechanism, which is arranged on the top of the pressing plate (4). Among them, the oil injection mechanism includes a transition sleeve (5), the bottom of the transition sleeve (5) is fixedly connected to the top of the pressing plate (4), the top of the transition sleeve (5) is fixedly connected to an oil storage cylinder (6), a cavity (39) is opened inside the oil storage cylinder (6), the top of the oil storage cylinder (6) is fixedly connected to a hydraulic cylinder (8), a displacement sensor (7) is fixedly installed inside the bottom end of the hydraulic cylinder (8), a buckle (9) is movably sleeved on the outer surface of the bottom end of the hydraulic cylinder (8), the bottom end of the buckle (9) is fixedly connected to a piston (10), a sealing ring (11) is movably sleeved on the outer surface of the piston (10), and the outer surfaces of the piston (10) and the sealing ring (11) are both movably connected to the inner surface of the cavity (39). When the hydraulic cylinder (8) starts, it will drive the buckle (9) to move. A connection mechanism, which is arranged inside the transition sleeve (5).

2. The quantitative oil injection device for the work roll between hot rolling mill rolls according to claim 1, characterized in that: The connection mechanism includes: An oil inlet check valve (12), the outer surface of the oil inlet check valve (12) is fixedly sleeved on the inner wall of the oil storage cylinder (6), the bottom end of the oil inlet check valve (12) penetrates through the oil storage cylinder (6) and extends into the interior of the transition sleeve (5), a connecting pipe (13) is fixedly sleeved inside the oil inlet check valve (12), the bottom end of the connecting pipe (13) penetrates through the transition sleeve (5) and extends into the interior of the pressing plate (4), a sealing gasket (14) is fixedly sleeved on the outer surface of the connecting pipe (13), the outer surface of the sealing gasket (14) is fixedly connected to the inner wall of the transition sleeve (5), and the bottom end of the connecting pipe (13) is fixedly sleeved with a hose (15). An oil outlet check valve (16), the outer surface of the oil outlet check valve (16) is fixedly sleeved on the inner wall of the oil storage cylinder (6), the bottom end of the oil outlet check valve (16) penetrates through the oil storage cylinder (6) and extends into the interior of the transition sleeve (5), and an oil outlet pipe (17) is fixedly sleeved inside the oil outlet check valve (16).

3. The quantitative oil injection device for the work roll in the hot rolling strip grinding roll stand according to claim 1, characterized in that: On the top of the base (2), first air cylinders (18) are fixedly installed on the left and right sides of the oil barrel (3). The top ends of the first air cylinders (18) are fixedly sleeved with mounting plates (19). Inside the mounting plates (19), connecting rods (20) are fixedly sleeved. The bottom ends of the connecting rods (20) are fixedly connected to the top of the pressing plate (4). The back of the first air cylinders (18) is fixedly connected to fixed rods (21).

4. The quantitative oil injection device for the work roll in the hot rolling mill stand according to claim 1, characterized in that: On the right side of the top of the bottom plate (1), an electric cabinet (22) is fixedly installed. On the left side of the electric cabinet (22), a first electric wire (23) is fixedly connected. The other end of the first electric wire (23) is fixedly connected to the top of the hydraulic cylinder (8).

5. A quantitative oil injection device for a work roll between hot rolling mill rolls according to claim 1, characterized in that: The top of the bottom plate (1) is fixedly installed with a hydraulic station (24) located on the left side of the electrical cabinet (22). The top of the hydraulic station (24) is fixedly installed with an oil pump (25). The bottom end of the oil pump (25) is fixedly connected with a proportional valve (26). The bottom end of the proportional valve (26) is fixedly connected with an oil suction pipe (27).

6. The quantitative oil injection device for the work roll in the hot rolling mill described in claim 5, characterized in that: The left side of the oil pump (25) is fixedly connected with an oil injection pipe (28). The other end of the oil injection pipe (28) is fixedly connected with the bottom of the right side of the hydraulic cylinder (8). The right side of the oil pump (25) is fixedly connected with a second electric wire (29). The right end of the second electric wire (29) is fixedly connected with the left side of the electrical cabinet (22). The top of the hydraulic station (24) is fixedly sleeved with an oil return pipe (30). The other end of the oil return pipe (30) is fixedly connected with the top of the right side of the hydraulic cylinder (8).

7. A quantitative oil injection device for a work roll in a hot rolling strip mill roll grinding stand according to claim 1, characterized in that: Chutes (31) are respectively arranged on the front and rear sides inside the base (2). Sliders (32) are movably installed inside the chutes (31).

8. The quantitative oil injection device for the work roll between hot rolling mill rolls according to claim 7, characterized in that: The top of the slider (32) is fixedly connected with a clamping block (33). The outer surface of the clamping block (33) is movably connected with the top of the base (2). The left end of the clamping block (33) is fixedly connected with a connecting block (34).

9. The quantitative oil injection device for the work roll in the hot rolling mill described in claim 1, wherein: A support plate (35) is fixedly installed on the left side of the top of the base (2). The top of the inner surface of the support plate (35) is fixedly installed with a second air cylinder (36). The bottom end of the second air cylinder (36) is fixedly connected with a lifting plate (37). The bottom end of the lifting plate (37) is hinged with a hinge rod (38). The bottom end of the hinge rod (38) is hinged with the left side of the connecting block (34).

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