A round billet surface grinding device and method of use

Abstract

The present application relates to a kind of round steel ingot surface grinding equipment and use method capable of improving grinding efficiency, reducing labor intensity, improving operating environment, including pedestal, conveying device, lifting rotating device, outer circle face grinding device, end face grinding device, pedestal is set conveying device, lifting rotating device, lifting rotating device is set between conveying device, the outer circle face grinding device of one side of pedestal is set, and end face grinding device is set at both ends of pedestal, the outer circle face and end face of the round steel ingot can be automatically machined by machine in the present application, can solve the problems of low efficiency, high labor intensity, poor operating environment of artificial grinding.

Description

Technical Field

[0001] This invention belongs to the field of steel ingot production technology, and in particular relates to a grinding equipment and method for grinding the surface of round steel ingots that can improve grinding efficiency, reduce labor intensity, and improve the operating environment. Background Technology

[0002] In the production process of round steel ingots, it is usually necessary to grind the outer round surface and two end faces of the steel ingots to remove surface defects such as oxide scale, slag inclusions, cracks, and cutting marks, so as to improve the surface quality of the round steel ingots. The traditional method is to use a handheld portable grinding wheel or a suspended grinding wheel for grinding, which has the problems of low grinding efficiency, high labor intensity and harsh operating environment. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a grinding equipment and method for the surface of round steel ingots, which can solve the problems of low efficiency, high labor intensity, and harsh operating environment associated with manual grinding.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A surface grinding device for round steel ingots includes a base, a conveying device installed and fixed on the base, and a lifting and rotating device. An outer circular surface grinding device is provided on one side of the base, and an end surface grinding device is provided at both ends of the base. The conveying device includes various conveying device frames, conveying rollers movably mounted on each conveying device frame, and a conveying device geared motor that drives the conveying rollers to rotate. The conveying rollers have V-shaped roller surfaces. When the conveying device geared motor drives the conveying rollers to rotate, the friction between the round steel ingot and the conveying roller causes the round steel ingot to move linearly. There are no fewer than three sets of conveying devices, and their total length is no less than 2.5 times the maximum length of the round steel ingot. When the round steel ingot is placed on the conveying device, the axis of the round steel ingot is perpendicular to the axis of the conveying roller of the conveying device. The lifting and rotating device lifts the circular steel ingot and drives it to rotate through friction. The lifting and rotating device includes a lifting and rotating device frame, a rotating active roller and a rotating driven roller movably mounted on the lifting and rotating device frame, and a lifting and rotating device reduction motor that drives the rotating active roller to rotate. The lifting and rotating device frame includes a lifting and rotating device frame base, a lifting platform movably mounted on the lifting and rotating device frame base and driving the rotating active roller and the rotating driven roller to move up and down, and a lifting hydraulic cylinder mounted on the lifting and rotating device frame base and supporting and driving the lifting platform to move up and down. The rotating active roller and the rotating driven roller are arranged in pairs. When the circular steel ingot is above the lifting and rotating device, the lifting hydraulic cylinder lifts the rotating active roller and the rotating driven roller and lifts the circular steel ingot. When the lifting and rotating device reduction motor drives the rotating active roller to rotate, the friction between the circular steel ingot and the rotating active roller causes the circular steel ingot to rotate. There are no fewer than two sets of lifting and rotating devices, and their total length is not less than 0.8 times the maximum length of the circular steel ingot. The outer cylindrical surface grinding device includes an outer cylindrical surface grinding device base, an outer cylindrical surface grinding track parallel to the axis of the circular steel ingot and mounted on the outer cylindrical surface grinding device base, an outer cylindrical surface grinding frame that moves along the outer cylindrical surface grinding track under the drive of a geared motor, a swing beam movably mounted at the head of the outer cylindrical surface grinding frame, a swing beam hydraulic cylinder connected to the rear of the swing beam, an outer cylindrical surface grinding wheel mounted at the head of the swing beam, a grinding motor connected to the outer cylindrical surface grinding wheel via a transmission belt, and the outer cylindrical surface grinding frame. The movable distance on the outer circular surface grinding track is equal to the maximum length of the circular steel ingot. The movement direction of the outer circular surface grinding machine frame on the outer circular surface grinding track is perpendicular to the axis of the conveying roller of the conveying device. The rotation surface of the outer circular surface grinding wheel forms a 90° angle with the axis of the conveying device. The pressure of the outer circular surface grinding wheel on the outer circular surface of the circular steel ingot is adjusted by the hydraulic cylinder of the swing beam. The grinding position of the outer circular surface grinding wheel on the outer circular surface of the circular steel ingot is adjusted by the reduction motor of the lifting and rotating device and the reduction motor of the outer circular surface grinding machine frame. The end face grinding device includes an end face grinding track arranged parallel to the axis of the circular steel ingot, an end face grinding moving seat that moves along the end face grinding track toward the circular steel ingot, an end face grinding transverse hydraulic cylinder that pushes the end face grinding moving seat to move left and right, an end face grinding slide perpendicular to the axis of the circular steel ingot and mounted on the end face grinding moving seat, an end face grinding frame that moves back and forth along the end face grinding slide, an end face grinding longitudinal hydraulic cylinder that pushes the end face grinding frame to move back and forth, an end face grinding guide column vertically mounted on the end face grinding frame, an end face grinding lifting beam movably mounted on the end face grinding guide column, and an end face grinding lifting beam that drives the end face grinding guide column to move up and down. The system includes a vertical hydraulic cylinder for surface grinding, an end-face grinding wheel movably mounted at one end of the end-face grinding lifting beam, and an end-face grinding motor that drives the end-face grinding wheel to rotate. The direction of movement of the end-face grinding moving seat on the end-face grinding track is consistent with the direction of movement of the conveying device. The direction of movement of the end-face grinding machine frame on the end-face grinding slide is at a 90° angle to the direction of movement of the conveying device. The rotating surface of the end-face grinding wheel is perpendicular to the end face of the round steel ingot. The pressure of the end-face grinding wheel on the end face of the round steel ingot is adjusted by the horizontal hydraulic cylinder for surface grinding. The grinding position of the end-face grinding wheel on the end face of the round steel ingot is adjusted by the longitudinal hydraulic cylinder and the vertical hydraulic cylinder for surface grinding.

[0005] The movable distance of the outer cylindrical grinding device is equal to the maximum length of the circular steel ingot, and its moving direction is opposite to the forward direction of the conveying device.

[0006] A method for using a surface grinding device for round steel ingots is as follows: First, the round steel ingot is placed on the conveying device, which moves it above the lifting and rotating device. The lifting and rotating device is then operated to lift the round steel ingot, causing the rotating drive roller and the rotating driven roller to rotate. The friction between the rotating drive roller and the round steel ingot drives the round steel ingot to rotate. The outer surface grinding device is then operated to rotate the outer surface grinding wheel and grind the outer surface of the round steel ingot. During the outer surface grinding, the pressure of the outer surface grinding wheel on the outer surface of the round steel ingot is adjusted by the hydraulic cylinder of the swing beam. The grinding position of the outer surface grinding wheel on the outer surface of the round steel ingot is adjusted by the reduction motor of the lifting and rotating device and the reduction motor of the outer surface grinding frame. Secondly, after the outer cylindrical surface is ground, the conveying device is operated to bring one end of the circular steel ingot close to the end face grinding device. The end face grinding device is then operated to rotate the end face grinding wheel and bring it close to the end face of the circular steel ingot for end face grinding. During end face grinding, the pressure of the end face grinding wheel on the end face of the circular steel ingot is adjusted by the end face grinding transverse hydraulic cylinder, and the grinding position of the end face grinding wheel on the end face of the circular steel ingot is adjusted by the end face grinding longitudinal hydraulic cylinder and the end face grinding vertical hydraulic cylinder.

[0007] The beneficial effects of the present invention are that it provides a grinding equipment and method for the surface of round steel ingots, which can automatically grind the outer surface and end face of round steel ingots, and can solve the problems of low efficiency, high labor intensity and harsh operating environment of manual grinding. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the present invention.

[0009] Figure 2 This is a schematic diagram of the grinding of the outer cylindrical surface of the present invention.

[0010] Figure 3 This is a schematic diagram of the end face grinding of the present invention. Detailed Implementation

[0011] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0012] like Figure 1 The illustrated equipment for grinding the surface of round steel ingots includes a base 1, a conveying device 2, a lifting and rotating device 3, an outer cylindrical surface grinding device 4, and an end surface grinding device 5. Specifically, it includes a base 1, a conveying device 2 mounted and fixed on the base 1, and a lifting and rotating device 3. An outer cylindrical surface grinding device 4 is located on one side of the base 1, and end surface grinding devices 5 are located at both ends of the base 1. The conveying device 2 and the lifting and rotating device 3 are mounted on the base 1, and are positioned on the same plane. When a round steel ingot 6 is placed on the conveying device 2, the axis of the round steel ingot 6 is perpendicular to the axis of the conveying roller 22 of the conveying device 2.

[0013] Combination Figure 1 , Figure 2 The conveying device 2 includes various conveying device frames 21, conveying rollers 22 movably mounted on various conveying device frames 21, and a conveying device reduction motor 23 that drives the conveying rollers 22 to rotate. The conveying rollers 22 have a V-shaped roller surface. When the conveying device reduction motor 23 drives the conveying rollers 22 to rotate, the friction between the circular steel ingot 6 and the conveying rollers 22 causes the circular steel ingot 6 to move linearly. The conveying device 2 has no less than three sets, and its total length is not less than 2.5 times the maximum length of the circular steel ingot 6. When the circular steel ingot 6 is placed on the conveying device 2, the axis of the circular steel ingot 6 is perpendicular to the axis of the conveying rollers 22 of the conveying device 2.

[0014] Combination Figure 1 , Figure 2The lifting and rotating device 3 lifts the circular steel ingot 6 and drives it to rotate through friction. The lifting and rotating device 3 includes a lifting and rotating device frame 31, a rotating drive roller 32 and a rotating driven roller 33 movably mounted on the lifting and rotating device frame 31, and a lifting and rotating device reduction motor 35 that drives the rotating drive roller 32 to rotate. The lifting and rotating device frame 31 includes a lifting and rotating device frame base, a lifting platform movably mounted on the lifting and rotating device frame base and driving the rotating drive roller 32 and the rotating driven roller 33 to move up and down, and a platform mounted on the lifting and rotating device frame. The lifting hydraulic cylinder 34, which supports the lifting platform, is mounted on the base and drives the lifting platform to move up and down. The rotating active roller 32 and the rotating driven roller 33 are arranged in pairs. When the round steel ingot 6 is above the lifting and rotating device 3, the lifting hydraulic cylinder 34 lifts the rotating active roller 32 and the rotating driven roller 33 and lifts the round steel ingot 6. When the lifting and rotating device reduction motor 35 drives the rotating active roller 32 to rotate, the friction between the round steel ingot 6 and the rotating active roller 32 causes the round steel ingot 6 to rotate. The lifting and rotating device 3 has no less than two sets, and its total length is not less than 0.8 times the maximum length of the round steel ingot 6.

[0015] Combination Figure 1 , Figure 2 The outer cylindrical surface grinding device 4 includes an outer cylindrical surface grinding device base 41, an outer cylindrical surface grinding track 42 parallel to the axis of the circular steel ingot 6 and mounted on the outer cylindrical surface grinding device base 41, an outer cylindrical surface grinding frame 43 that moves along the outer cylindrical surface grinding track 42 under the drive of the outer cylindrical surface grinding frame reduction motor 44, a swing beam 45 movably mounted in the middle at the head of the outer cylindrical surface grinding frame, a swing beam hydraulic cylinder 46 connected to the rear of the swing beam, an outer cylindrical surface grinding wheel 47 mounted at the head of the swing beam, and a grinding motor 48 connected to the outer cylindrical surface grinding wheel 47 via a transmission belt. 3. The movable distance on the outer circular surface grinding track 42 is equal to the maximum length of the circular steel ingot 6. The moving direction of the outer circular surface grinding frame 43 on the outer circular surface grinding track 42 is perpendicular to the axis of the conveying roller 22 of the conveying device 2. The rotating surface of the outer circular surface grinding wheel 47 forms a 90° angle with the axis of the conveying device 2. The pressure of the outer circular surface grinding wheel 47 acting on the outer circular surface of the circular steel ingot 6 is adjusted by the swing beam hydraulic cylinder 46. The grinding position of the outer circular surface grinding wheel 47 on the outer circular surface of the circular steel ingot 6 is adjusted by the lifting and rotating device reduction motor 35 and the outer circular surface grinding frame reduction motor 44.

[0016] Combination Figure 1 , Figure 3The end face grinding device 5 includes an end face grinding track 51 arranged parallel to the axis of the circular steel ingot 6, an end face grinding moving seat 52 that moves along the end face grinding track 51 toward the circular steel ingot 6, an end face grinding transverse hydraulic cylinder 53 that pushes the end face grinding moving seat 52 to move left and right, an end face grinding slide 54 that is perpendicular to the axis of the circular steel ingot 6 and is set on the end face grinding moving seat 52, an end face grinding frame 55 that moves back and forth along the end face grinding slide 54, an end face grinding longitudinal hydraulic cylinder 56 that pushes the end face grinding frame 55 to move back and forth, an end face grinding guide column 57 that is vertically set on the end face grinding frame 55, an end face grinding lifting beam 58 that is movably installed on the end face grinding guide column 57, and an end face grinding lifting beam 58 that drives the end face grinding lifting beam 58 to move up and down along the end face grinding guide column 57. The grinding system includes a vertical hydraulic cylinder 59, an end-face grinding wheel 510 movably mounted on one end of the end-face grinding lifting beam 58, an end-face grinding motor 511 that drives the end-face grinding wheel 510 to rotate, an end-face grinding moving seat 52 whose movement direction on the end-face grinding track 51 is consistent with the movement direction of the conveying device 2, an end-face grinding frame 55 whose movement direction on the end-face grinding slide 54 forms a 90° angle with the movement direction of the conveying device 2, and an end-face grinding wheel 510 whose rotation surface is perpendicular to the end face of the circular steel ingot 6. The pressure of the end-face grinding wheel 510 on the end face of the circular steel ingot 6 is adjusted by the end-face grinding horizontal hydraulic cylinder 53, and the grinding position of the end-face grinding wheel 510 on the end face of the circular steel ingot 6 is adjusted by the end-face grinding longitudinal hydraulic cylinder 56 and the end-face grinding vertical hydraulic cylinder 59.

[0017] Combination Figure 1 , Figure 2 , Figure 3 A method for using a surface grinding device for round steel ingots, the specific method of use is as follows: First, the circular steel ingot 6 is placed on the conveying device 2. The conveying device 2 moves the circular steel ingot 6 above the lifting and rotating device 3. The lifting and rotating device 3 is operated to lift the circular steel ingot 6. The lifting and rotating device 3 is operated to make the rotating active roller 32 and the rotating driven roller 33 rotate. The friction between the rotating active roller 32 and the circular steel ingot 6 drives the circular steel ingot 6 to rotate. The outer circular surface grinding device 4 is operated to make the outer circular surface grinding wheel 47 rotate and closely adhere to the outer circular surface of the circular steel ingot 6 for outer circular surface grinding. During the outer circular surface grinding, the pressure of the outer circular surface grinding wheel 47 acting on the outer circular surface of the circular steel ingot 6 is adjusted by the swing beam hydraulic cylinder 46. The grinding position of the outer circular surface grinding wheel 47 on the outer circular surface of the circular steel ingot 6 is adjusted by the lifting and rotating device reduction motor 35 and the outer circular surface grinding frame reduction motor 44. Secondly, after the outer cylindrical surface is ground, the lifting and rotating device 3 lowers the circular steel ingot 6 onto the conveying roller 22 of the conveying device 2. The conveying roller 22 brings one end face of the circular steel ingot 6 close to the end face grinding device 5. The end face grinding device 5 is operated to rotate the end face grinding wheel 510 and press it against the end face of the circular steel ingot 6 for end face grinding. During end face grinding, the pressure of the end face grinding wheel 510 acting on the end face of the circular steel ingot 6 is adjusted by the end face grinding transverse hydraulic cylinder 53, and the grinding position of the end face grinding wheel 510 on the end face of the circular steel ingot 6 is adjusted by the end face grinding longitudinal hydraulic cylinder 56 and the end face grinding vertical hydraulic cylinder 59.

[0018] Combination Figure 1 , Figure 2 , Figure 3 By combining the conveying device 2, the lifting and rotating device 3, the outer surface grinding device 4, and the end surface grinding device 5, the outer surface and end surface of the round steel ingot 6 can be automatically ground by machine, thereby replacing manual grinding and solving the problems of high labor intensity, harsh operating environment and low efficiency of manual grinding.

Claims

1. A surface grinding device for round steel ingots, comprising a base (1), a conveying device (2) mounted and fixed on the base (1), and a lifting and rotating device (3), characterized in that: An outer circular surface grinding device (4) is provided on one side of the base (1), and an end face grinding device (5) is provided at both ends of the base (1). The conveying device (2) includes each conveying device frame (21), conveying rollers (22) movably mounted on each conveying device frame (21), and a conveying device reduction motor (23) that drives the conveying rollers (22) to rotate. The conveying rollers (22) are V-shaped roller surfaces. When the conveying device reduction motor (23) drives the conveying rollers (22) to rotate, the friction between the round steel ingot (6) and the conveying rollers (22) causes the round steel ingot (6) to move linearly. The conveying device (2) has no less than three sets, and its total length is not less than 2.5 times the maximum length of the round steel ingot (6). When the round steel ingot (6) is placed on the conveying device (2), the axis of the round steel ingot (6) is perpendicular to the axis of the conveying rollers (22) of the conveying device (2). The lifting and rotating device (3) lifts the round steel ingot (6) and drives the round steel ingot (6) to rotate through friction. The lifting and rotating device (3) includes a lifting and rotating device frame (31), a rotating active roller (32) and a rotating driven roller (33) movably mounted on the lifting and rotating device frame (31), and a lifting and rotating device reduction motor (35) that drives the rotating active roller (32) to rotate. The lifting and rotating device frame (31) includes a lifting and rotating device frame base, a lifting platform movably mounted on the lifting and rotating device frame base and driving the rotating active roller (32) and the rotating driven roller (33) to move up and down, and a platform mounted on the lifting and rotating device frame base. The lifting hydraulic cylinder (34) supports and drives the lifting platform to move up and down. The rotating active roller (32) and rotating driven roller (33) are arranged in pairs. When the round steel ingot (6) is above the lifting and rotating device (3), the lifting hydraulic cylinder (34) lifts up the rotating active roller (32) and rotating driven roller (33) and lifts up the round steel ingot (6). When the lifting and rotating device reduction motor (35) drives the rotating active roller (32) to rotate, the friction between the round steel ingot (6) and the rotating active roller (32) causes the round steel ingot (6) to rotate. The lifting and rotating device (3) has no less than two sets, and its total length is not less than 0.8 times the maximum length of the round steel ingot (6). The outer cylindrical surface grinding device (4) includes an outer cylindrical surface grinding device base (41), an outer cylindrical surface grinding track (42) set on the outer cylindrical surface grinding device base (41) parallel to the axial direction of the circular steel ingot (6), an outer cylindrical surface grinding frame (43) that moves along the outer cylindrical surface grinding track (42) under the drive of the outer cylindrical surface grinding frame reduction motor (44), a swing beam (45) movably installed in the middle at the head of the outer cylindrical surface grinding frame, a swing beam hydraulic cylinder (46) connected to the rear of the swing beam, an outer cylindrical surface grinding wheel (47) installed at the head of the swing beam, and a grinding motor (48) connected to the outer cylindrical surface grinding wheel (47) via a transmission belt. The movable distance of the outer cylindrical surface grinding frame (43) on the outer cylindrical surface grinding track (42) is equal to the maximum length of the circular steel ingot (6). The moving direction of the outer cylindrical surface grinding frame (43) on the outer cylindrical surface grinding track (42) is the same as that of the conveying device (2). The axis of the conveying roller (22) is perpendicular to the axis of the conveying device (2); the rotating surface of the outer circular grinding wheel (47) is at a 90° angle to the axis of the conveying device (2). The pressure of the outer circular grinding wheel (47) acting on the outer circular surface of the circular steel ingot (6) is adjusted by the swing beam hydraulic cylinder (46). The grinding position of the outer circular grinding wheel (47) on the outer circular surface of the circular steel ingot (6) is adjusted by the lifting and rotating device reduction motor (35) and the outer circular grinding frame reduction motor (44). The end face grinding device (5) includes an end face grinding track (51) arranged in alignment with the axis of the circular steel ingot (6), an end face grinding moving seat (52) that moves along the end face grinding track (51) toward the circular steel ingot (6), an end face grinding transverse hydraulic cylinder (53) that pushes the end face grinding moving seat (52) to move left and right, an end face grinding slide (54) set on the end face grinding moving seat (52) and perpendicular to the axis of the circular steel ingot (6), an end face grinding frame (55) that moves back and forth along the end face grinding slide (54), an end face grinding longitudinal hydraulic cylinder (56) that pushes the end face grinding frame (55) to move back and forth, an end face grinding guide column (57) vertically set on the end face grinding frame (55), an end face grinding lifting beam (58) movably mounted on the end face grinding guide column (57), and an end face grinding lifting beam (58) that drives the end face grinding lifting beam (58) to move up and down along the end face grinding guide column (57). The end face grinding vertical hydraulic cylinder (59), the end face grinding wheel (510) movably installed at one end of the end face grinding lifting beam (58), the end face grinding motor (511) driving the end face grinding wheel (510) to rotate, the end face grinding moving seat (52) moving in the same direction as the movement direction of the conveying device (2) on the end face grinding track (51), the end face grinding frame (55) moving in the same direction as the movement direction of the conveying device (2) on the end face grinding slide (54), the rotation surface of the end face grinding wheel (510) is perpendicular to the end face of the round steel ingot (6), the pressure of the end face grinding wheel (510) acting on the end face of the round steel ingot (6) is adjusted by the end face grinding horizontal hydraulic cylinder (53), and the grinding position of the end face grinding wheel (510) on the end face of the round steel ingot (6) is adjusted by the end face grinding longitudinal hydraulic cylinder (56) and the end face grinding vertical hydraulic cylinder (59).

2. The surface grinding equipment for round steel ingots according to claim 1, characterized in that: The movable distance of the outer cylindrical grinding device (4) is equal to the maximum length of the circular steel ingot (6), and its moving direction is opposite to the forward direction of the conveying device (2).

3. The surface grinding equipment for round steel ingots according to claim 1, characterized in that: There are no fewer than three sets of conveying devices (2); a lifting and rotating device (3) is provided between each set of conveying devices (2).

4. A method of using the round steel ingot surface grinding equipment as described in any one of claims 1-3, characterized in that... The specific usage method is as follows: First, place the round steel ingot (6) on the conveying device (2). The conveying device (2) moves the round steel ingot (6) above the lifting and rotating device (3). Operate the lifting and rotating device (3) to lift the round steel ingot (6). Operate the lifting and rotating device (3) to make the rotating drive roller (32) and the rotating driven roller (33) rotate. The friction between the rotating active roller (32) and the circular steel ingot (6) drives the circular steel ingot (6) to rotate. The operation of the outer circular surface grinding device (4) causes the outer circular surface grinding wheel (47) to rotate and closely adhere to the outer circular surface of the circular steel ingot (6) for outer circular surface grinding. During the outer circular surface grinding, the pressure of the outer circular surface grinding wheel (47) acting on the outer circular surface of the circular steel ingot (6) is adjusted by the swing beam hydraulic cylinder (46). The grinding position of the outer circular surface grinding wheel (47) on the outer circular surface of the circular steel ingot (6) is adjusted by the lifting and rotating device reduction motor (35) and the outer circular surface grinding frame reduction motor (44). Secondly, after the outer surface grinding is completed, the lifting and rotating device (3) drops the round steel ingot (6) onto the conveying roller (22) of the conveying device (2). The conveying roller (22) brings one end face of the round steel ingot (6) close to the end face grinding device (5). The end face grinding device (5) is operated to make the end face grinding wheel (510) rotate and closely adhere to the end face of the round steel ingot (6) for end face grinding. During the end face grinding, the pressure of the end face grinding wheel (510) acting on the end face of the round steel ingot (6) is adjusted by the end face grinding transverse hydraulic cylinder (53). The grinding position of the end face grinding wheel (510) on the end face of the round steel ingot (6) is adjusted by the end face grinding longitudinal hydraulic cylinder (56) and the end face grinding vertical hydraulic cylinder (59).

Images