Glass printing detection mechanism
The glass printing detection mechanism that integrates printing, detection, sorting and transmission functions solves the problems of low automation and inaccurate detection in the existing technology, and realizes efficient and automated glass printing detection and sorting.
Patent Information
- Application Number
- CN202422702243.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-06
AI Technical Summary
The existing glass printing device has a low degree of automation, and the printing effect relies on manual visual inspection, which is inefficient and imprecise, making it difficult to detect subtle problems.
A glass printing and inspection mechanism integrating printing, inspection, sorting and transmission has been designed. It includes a pre-positioning section, a printing section, an inspection section, an unqualified outflow section and a furnace positioning section. It uses a camera and a computer collector for automatic inspection, and combines a cylinder and an adjustment bracket to achieve precise positioning and transportation of the glass.
It realizes the automation of glass printing, improves the detection accuracy and efficiency, can accurately sort out unqualified products and separate and transport them, reduces the labor intensity of workers and improves production efficiency.
Smart Images

Figure CN223355222U_ABST
Abstract
Description
Technical Field
[0001] The utility model discloses a glass printing detection mechanism, which belongs to the technical field of glass printing. Background Art
[0002] Glass printing refers to a printing method primarily used on glass sheets or containers. During the glass manufacturing process, designs, trademarks, or model numbers are often printed on the glass to meet product differentiation and aesthetic requirements. After the design is applied to the glass surface using specialized ink, a high-temperature sintering process is required to solidify the image and text. Existing glass printing equipment has a low level of automation, and manual visual inspection of print results is inefficient. Furthermore, manual inspection is imprecise and can miss subtle defects. Utility Model Content
[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a glass printing and testing mechanism that integrates printing, testing, sorting and transmission.
[0004] To achieve the above-mentioned object, the present invention adopts the following technical solution: a glass printing inspection mechanism, comprising a pre-positioning section, a printing section, a detection section, a non-conforming product outflow section, and a furnace front positioning section connected in sequence; the pre-positioning section comprises a first roller conveyor, a first left-right adjustment bracket, and a first positioning cylinder; the first left-right adjustment bracket is disposed on the first roller conveyor, and a plurality of first positioning cylinders are disposed in front of the first roller conveyor;
[0005] The printing section includes a second roller conveyor, a second left-right adjustment bracket, a second positioning cylinder and a printing device, the second left-right adjustment bracket is arranged on the second roller conveyor, a plurality of second positioning cylinders are arranged in front of the second roller conveyor, and the printing device is arranged above the second roller conveyor;
[0006] The detection section includes a conveying device, a camera and a computer collector, wherein the camera is arranged above the conveying device and connected to the computer collector;
[0007] The unqualified outflow section includes a third roller conveyor and a lifting and translation conveyor, the lifting and translation conveyor is installed in the third roller conveyor, and the lifting and translation conveyor is perpendicular to the conveying direction of the third roller conveyor;
[0008] The furnace front positioning section includes a fourth roller conveyor, a first stacking machine, multiple fifth roller conveyors and a third positioning cylinder. The first stacking machine is arranged above the fourth roller conveyor. Multiple fifth roller conveyors are connected to the fourth roller conveyor in sequence. The frontmost fifth roller conveyor is provided with a third left and right adjustment bracket, and multiple third positioning cylinders are arranged in front of the frontmost fifth roller conveyor.
[0009] Furthermore, the lifting and translating conveyor is connected to a transmission device, and a second stacking machine is provided on the transmission device.
[0010] Furthermore, the first left and right adjustment brackets include a base, a left adjustment frame, a right adjustment frame, a first transmission rod and a second transmission rod. In the left adjustment frame, the adjustment bar is located above the first roller conveyor, and the adjustment bar is detachably mounted on a crossbeam located below the roller conveyor through a plurality of support rods located in the gap between the rollers. The crossbeam is slidably mounted on the base. The structure of the right adjustment frame is symmetrical to that of the left adjustment frame. The first transmission rod and the second transmission rod are both rotatably mounted on the base. The first transmission rod is connected to the left adjustment frame in a spiral transmission manner, and the second transmission rod is connected to the right adjustment frame in a spiral transmission manner. The same end of the first transmission rod and the second transmission rod is respectively connected to a rotating handle.
[0011] The structures of the second left-right adjustment bracket and the third left-right adjustment bracket are the same as that of the first left-right adjustment bracket.
[0012] Furthermore, the second transmission rod includes a polished rod, a lead screw and a coupling. The polished rod and the lead screw are connected together through the coupling, and the lead screw is connected to the right adjustment frame through a spiral transmission.
[0013] Furthermore, the adjustment bars in the left adjustment frame and the right adjustment frame are arranged in parallel, and the entrance sections are in a bell-mouth shape.
[0014] Furthermore, the conveying device is a double-row narrow belt conveyor.
[0015] Furthermore, the lifting and translation conveyor includes a base frame, a lifting platform, a lifting mechanism and multiple rows of narrow belt conveyors. The lifting platform is installed on the base frame through the lifting mechanism, and the multiple rows of narrow belt conveyors are installed on the lifting platform.
[0016] Furthermore, the lifting mechanism includes a cylinder, a mounting shaft, an L-shaped rod and a connecting rod. The two mounting shafts are rotatably mounted on the base frame. The two ends of the two mounting shafts are fixedly connected to the corner of an L-shaped rod. The two L-shaped rods located on the same side of the mounting shaft form a group. The bottom ends of the two L-shaped rods in each group are hinged together by a connecting rod. The upper ends of the four L-shaped rods are hinged to the bottom of the lifting platform. The cylinder is horizontally mounted on the base frame, and the cylinder rod is hinged to one of the L-shaped rods.
[0017] Furthermore, the printing section also includes an optical fiber switch for detecting the position of the glass, and the optical fiber switch is connected to the second positioning cylinder and the printing device.
[0018] Furthermore, the number of the first positioning cylinder, the second positioning cylinder, and the third positioning cylinder is two or three.
[0019] Compared with the prior art, the present invention has the following beneficial effects.
[0020] This new system integrates glass printing, testing, sorting, and transportation into one unit, ensuring accurate glass positioning and excellent printing results. Furthermore, computerized testing ensures high accuracy and efficiency. Unqualified glass is sorted out by a lifting and sliding conveyor, while qualified glass is transported to a heating furnace for high-temperature sintering. In special circumstances, qualified glass can be temporarily stored at the first stacking machine. The high degree of overall automation improves production efficiency and reduces worker labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0022] Figure 1 It is a structural diagram of the present utility model.
[0023] Figure 2 for Figure 1 Top view of .
[0024] Figure 3 It is a structural schematic diagram of the pre-positioning section in the utility model.
[0025] Figure 4 It is a structural schematic diagram of the printing section in the utility model.
[0026] Figure 5 This is a structural diagram of the first left and right adjustment bracket in the utility model.
[0027] Figure 6 for Figure 5 Top view of .
[0028] Figure 7 It is a structural schematic diagram of the lifting and sliding conveyor in the utility model.
[0029] Figure 8 for Figure 7 Top view of .
[0030] Figure 9 It is a structural diagram of the lifting mechanism in the utility model.
[0031] In the figure: 1 is the pre-positioning section, 11 is the first roller conveyor, 12 is the first left and right adjustment bracket, 13 is the first positioning cylinder, 14 is the base, 15 is the left adjustment bracket, 151 is the adjustment bar, 152 is the support rod, 153 is the crossbeam, 16 is the right adjustment bracket, 17 is the first transmission rod, 18 is the second transmission rod, 181 is the polished rod, 182 is the screw rod, 183 is the coupling, 19 is the rotating handle, 2 is the printing section, 21 is the second roller conveyor, 22 is the second left and right adjustment bracket, 23 is the second positioning cylinder, 24 is the printing device, 3 is the detection Section, 31 is the conveying device, 32 is the camera, 4 is the unqualified outflow section, 41 is the third roller conveyor, 42 is the lifting and sliding conveyor, 43 is the base frame, 44 is the lifting platform, 45 is the lifting mechanism, 451 is the cylinder, 452 is the installation shaft, 453 is the L-shaped rod, 454 is the connecting rod, 46 is the multi-row narrow belt conveyor, 47 is the transmission device, 48 is the second stacking machine, 5 is the furnace front positioning section, 51 is the fourth roller conveyor, 52 is the first stacking machine, 53 is the fifth roller conveyor, 54 is the third positioning cylinder, and 55 is the third left and right adjustment bracket. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the present invention are clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0033] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any actual relationship or order between these entities.
[0034] In the present invention, the forward direction of the glass is referred to as the front, and the left and right sides of a person facing forward are referred to as the left and right sides.
[0035] The utility model provides the following embodiments.
[0036] like Figure 1 、 Figure 2 、 Figure 3As shown, a glass printing detection mechanism includes a pre-positioning section 1, a printing section 2, a detection section 3, an unqualified outflow section 4 and a furnace front positioning section 5 connected in sequence. The pre-positioning section 1 includes a first roller conveyor 11, a first left and right adjustment bracket 12 and a first positioning cylinder 13. The first left and right adjustment bracket 12 is arranged on the first roller conveyor 11, and multiple first positioning cylinders 13 are arranged in front of the first roller conveyor 11; a stopper is provided at the end of the lever of the first positioning cylinder 13. When the lever is extended, it can block the glass and cooperate with the first left and right adjustment bracket 12 to improve the pre-positioning effect of the glass.
[0037] like Figure 5 、 Figure 6 As shown, the first left and right adjustment bracket 12 includes a base 14, a left adjustment frame 15, a right adjustment frame 16, a first transmission rod 17 and a second transmission rod 18. In the left adjustment frame 15, the adjustment bar 151 is located above the first roller conveyor 11, and the adjustment bar 151 is detachably mounted on a crossbeam 153 located below the roller conveyor through a plurality of support rods 152 located in the gap between the rollers. The crossbeam 153 is slidably mounted on the base 14. The structure of the right adjustment frame 16 is symmetrical to that of the left adjustment frame 15. The first transmission rod 17 and the second transmission rod 18 are both rotatably mounted on the base 14. The first transmission rod 17 is connected to the left adjustment frame 15 in a spiral transmission connection, and the second transmission rod 18 is connected to the right adjustment frame 16 in a spiral transmission connection. The same end of the first transmission rod 17 and the second transmission rod 18 is respectively connected to a rotating handle 19;
[0038] The adjustment bar 151 is located above the roller in the first roller conveyor 11, with a gap between the adjustment bar 151 and the roller. The gap is smaller than the thickness of the glass to be printed, so that the adjustment bar 151 can push the glass to adjust its position.
[0039] The second transmission rod 18 can be a whole threaded rod, or it can be spliced by a polished rod 181 and a screw rod 182. The polished rod 181 and the screw rod 182 are both rotatably mounted on the base 14 and connected together through a coupling 183. The screw rod 181 is connected to the right adjustment frame 16 through a spiral transmission.
[0040] The adjustment bars 151 in the left adjustment frame 15 and the right adjustment frame 16 are arranged in parallel, and the entrance sections are in a bell-mouth shape.
[0041] like Figure 4 As shown, the printing section 2 includes a second roller conveyor 21, a second left-right adjustment bracket 22, a second positioning cylinder 23 and a printing device 24. The second left-right adjustment bracket 22 is arranged on the second roller conveyor 21, a plurality of second positioning cylinders 23 are arranged in front of the second roller conveyor 21, and the printing device 24 is arranged above the second roller conveyor 21.
[0042] The structure of the second left-right adjustment bracket 22 is the same as that of the first left-right adjustment bracket 12 .
[0043] Printing section 2 may also include a fiber optic switch for detecting the position of the glass. This fiber optic switch is connected to the second positioning cylinder 23 and the printing device 24. Upon detecting the arrival of the glass, the fiber optic switch controls the second positioning cylinder 23 to raise, stopping the glass from moving, and simultaneously controls the printing device 24 to begin printing. Furthermore, to ensure optimal printing quality, the second roller conveyor 21 may be controlled to switch from high speed to low speed, ensuring stability during printing.
[0044] The detection section 3 includes a conveyor 31, a camera 32, and a computer collector 33. The camera 32 is located above the conveyor 31 and is connected to the computer collector. The computer collector stores standard patterns that can be compared with images captured by the camera 32 for detection. The conveyor 31 is a double-lane narrow belt conveyor.
[0045] The unqualified outflow section 4 includes a third roller conveyor 41 and a lifting and translation conveyor 42. The lifting and translation conveyor 42 is installed in the third roller conveyor 41. The lifting and translation conveyor 42 is perpendicular to the conveying direction of the third roller conveyor 41.
[0046] The lifting and translating conveyor 42 is connected to a transmission device 47 , and a second stacking machine 48 is provided on the transmission device 47 .
[0047] like Figure 7 、 Figure 8 As shown, the lifting and translating conveyor 42 comprises a base frame 43, a lifting platform 44, a lifting mechanism 45, and a multi-row narrow belt conveyor 46. The lifting platform 44 is mounted on the base frame 43 via the lifting mechanism 45, and the multi-row narrow belt conveyor 46 is mounted on the lifting platform 44. The multiple narrow belts in the multi-row narrow belt conveyor 46 are positioned in the gaps between the rollers of the third roller conveyor 41. The lifting mechanism 45 can have various structures, as long as it can smoothly lift and lower the lifting platform 44. A preferred structure is described below.
[0048] like Figure 9 As shown, the lifting mechanism 45 includes a cylinder 451, a mounting shaft 452, an L-shaped rod 453 and a connecting rod 454. The two mounting shafts 452 are rotatably mounted on the base frame 43. The two ends of the two mounting shafts 452 are fixedly connected to the corner of an L-shaped rod 453. The two L-shaped rods 453 located on the same side of the mounting shaft 452 are a group. The bottom ends of the two L-shaped rods 453 in each group are hinged together by a connecting rod 454. The upper ends of the four L-shaped rods 453 are hinged to the bottom of the lifting platform 44. The cylinder 451 is horizontally mounted on the base frame 43, and the cylinder rod is hinged to one of the L-shaped rods 453.
[0049] The furnace front positioning section 5 includes a fourth roller conveyor 51, a first stacking machine 52, multiple fifth roller conveyors 53 and a third positioning cylinder 54. The first stacking machine 52 is arranged above the fourth roller conveyor 51, and multiple fifth roller conveyors 53 are connected to the fourth roller conveyor 51 in sequence. A third left and right adjustment bracket 55 is provided on the front end fifth roller conveyor 53, and multiple third positioning cylinders 54 are arranged in front of the front end fifth roller conveyor 51.
[0050] The structure of the third left-right adjustment bracket 55 is the same as that of the first left-right adjustment bracket 12 .
[0051] The number of the first positioning cylinder 13 , the second positioning cylinder 23 , and the third positioning cylinder 54 is two or three.
[0052] The first roller conveyor 11 , the second roller conveyor 21 , the third roller conveyor 41 , the fourth roller conveyor 51 and the fifth roller conveyor 53 are all powered roller conveyors.
[0053] The first left-right adjustment bracket 12 is adjusted by manually rotating the handle 19, which adjusts the position of the left adjustment bracket 15 via the first transmission rod 17 through screw drive, and the right adjustment bracket 16 via the second transmission rod 18 through screw drive. During operation, the positions of the two adjustment bars 151 are first adjusted according to the width of the glass. Once the glass reaches the desired position, the left-right position of the glass can be controlled. If the position is still not appropriate, fine-tuning can be performed by rotating the two handles 19.
[0054] In the unqualified outflow section 4, under normal circumstances, the conveying surface of the multi-row narrow belt conveyor 46 is lower than the conveying surface of the third roller conveyor 41. When the detection section 3 detects that the glass printing is unqualified and the glass is transmitted to the multi-row narrow belt conveyor 46, the cylinder 451 is actuated, the L-shaped rod 453 rotates, and the upper end drives the lifting platform 44 to rise, and the multi-row narrow belt conveyor 46 rises accordingly, higher than the third roller conveyor 41, and the unqualified glass is lifted and sent to the transmission device 47, and then temporarily stored in the second stacking machine 48. Then, the unqualified printed patterns are cleaned uniformly, and can be reprinted after washing and drying.
[0055] The working process of the utility model is as follows.
[0056] First, the glass to be printed is placed in pre-positioning section 1. The first left-right adjustment bracket 12 on the pre-positioning section cooperates with the first positioning cylinder 13 to pre-position the glass. Then, the first positioning cylinder 13 retracts, and the glass is conveyed to printing section 2. The second left-right adjustment bracket 22 on printing section 2 maintains the glass's position. After the fiber optic switch detects the glass's arrival, it controls the second positioning cylinder 23 to raise, halting its forward motion. Simultaneously, the second roller conveyor 21 switches from high speed to low speed, and the printing device 24 begins printing on the glass. After printing is complete, the second positioning cylinder 23 lowers, and the second roller conveyor 21 resumes its speed, continuing to convey the glass forward. Once the glass reaches inspection section 3, a camera 32 takes a photo of the printed pattern and uploads it to a computer data collector for comparison with a standard pattern to determine whether the pattern has defects such as ghosting, burrs, broken lines, broken points, or blurring. If the comparison passes, a pass signal is issued; if the comparison fails, a fail signal is issued. Upon receiving the unqualified signal, the lifting and sliding conveyor 42 rises, sorting out the unqualified glass and sending it to the second stacker 47 for temporary storage via the conveyor 47. Upon receiving the qualified signal, the lifting and sliding conveyor 42 stops, and the glass is conveyed to the furnace front positioning section 5 via the third roller conveyor 41. If the heating furnace is feeding normally, the glass passes through the fourth roller conveyor 51 and the fifth roller conveyor 53 before entering the heating furnace for high-temperature sintering. If the heating furnace is temporarily unable to feed, the glass is temporarily stored at the first stacker 52 until the heating furnace is able to feed normally, at which point it is continued to be fed into the heating furnace via the fifth roller conveyor 53.
[0057] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.
Claims
1. A glass printing detection mechanism, characterized by: The invention comprises a pre-positioning section (1), a printing section (2), a detection section (3), an unqualified outflow section (4) and a furnace front positioning section (5) connected in sequence, wherein the pre-positioning section (1) comprises a first roller conveyor (11), a first left-right adjustment bracket (12) and a first positioning cylinder (13), wherein the first left-right adjustment bracket (12) is arranged on the first roller conveyor (11), and a plurality of first positioning cylinders (13) are arranged in front of the first roller conveyor (11); The printing section (2) comprises a second roller conveyor (21), a second left-right adjustment bracket (22), a second positioning cylinder (23) and a printing device (24), wherein the second left-right adjustment bracket (22) is arranged on the second roller conveyor (21), a plurality of second positioning cylinders (23) are arranged in front of the second roller conveyor (21), and the printing device (24) is arranged above the second roller conveyor (21); The detection section (3) includes a conveying device (31), a camera (32) and a computer collector, wherein the camera (32) is arranged above the conveying device (31) and is connected to the computer collector; The unqualified outflow section (4) includes a third roller conveyor (41) and a lifting and translation conveyor (42), wherein the lifting and translation conveyor (42) is installed in the third roller conveyor (41), and the lifting and translation conveyor (42) and the third roller conveyor (41) have conveying directions perpendicular to each other; The furnace front positioning section (5) comprises a fourth roller conveyor (51), a first laminating machine (52), a plurality of fifth roller conveyors (53) and a third positioning cylinder (54). The first laminating machine (52) is arranged above the fourth roller conveyor (51). The plurality of fifth roller conveyors (53) are sequentially connected to the fourth roller conveyor (51). A third left-right adjustment bracket (55) is provided on the frontmost fifth roller conveyor (53). The plurality of third positioning cylinders (54) are arranged in front of the frontmost fifth roller conveyor (53).
2. A glass printing detection mechanism according to claim 1, characterized in that: The lifting and translation conveyor (42) is connected to a transmission device (47), and a second laminating machine (48) is provided on the transmission device (47).
3. A glass printing detection mechanism according to claim 1 or 2, characterized in that: The first left and right adjustment bracket (12) includes a base (14), a left adjustment frame (15), a right adjustment frame (16), a first transmission rod (17) and a second transmission rod (18). In the left adjustment frame (15), an adjustment bar (151) is located above the first roller conveyor (11). The adjustment bar (151) is detachably mounted on a crossbeam (153) located below the roller conveyor through a plurality of support rods (152) located in the gap between the rollers. The crossbeam (153) is slidably mounted on the base (14). The structure of the right adjustment frame (16) is symmetrical to that of the left adjustment frame (15). The first transmission rod (17) and the second transmission rod (18) are both rotatably mounted on the base (14). The first transmission rod (17) is connected to the left adjustment frame (15) by screw transmission. The second transmission rod (18) is connected to the right adjustment frame (16) by screw transmission. The same end of the first transmission rod (17) and the second transmission rod (18) is respectively connected to a rotating handle (19). The structures of the second left-right adjustment bracket (22) and the third left-right adjustment bracket (55) are the same as the structure of the first left-right adjustment bracket (12).
4. A glass printing detection mechanism according to claim 3, characterized in that: The second transmission rod (18) comprises a polished rod (181), a screw rod (182) and a coupling (183); the polished rod (181) and the screw rod (182) are connected together via the coupling (183); and the screw rod (182) is connected to the right adjustment frame (16) via a spiral transmission.
5. The glass printing detection mechanism according to claim 3, characterized in that: The adjustment bars (151) in the left adjustment frame (15) and the right adjustment frame (16) are arranged in parallel, and the entrance sections are in a bell-mouth shape.
6. A glass printing detection mechanism according to claim 1 or 2, characterized in that: The conveying device (31) is a double-row narrow belt conveyor.
7. A glass printing detection mechanism according to claim 1 or 2, characterized in that: The lifting and translation conveyor (42) comprises a base frame (43), a lifting platform (44), a lifting mechanism (45) and a multi-row narrow belt conveyor (46); the lifting platform (44) is mounted on the base frame (43) via the lifting mechanism (45), and the multi-row narrow belt conveyor (46) is mounted on the lifting platform (44).
8. The glass printing detection mechanism according to claim 7, characterized in that: The lifting mechanism (45) includes a cylinder (451), a mounting shaft (452), an L-shaped rod (453) and a connecting rod (454). The two mounting shafts (452) are rotatably mounted on the base frame (43). The two ends of the two mounting shafts (452) are fixedly connected to the corners of an L-shaped rod (453). The two L-shaped rods (453) located on the same side of the mounting shaft (452) form a group. The bottom ends of the two L-shaped rods (453) in each group are hinged together by a connecting rod (454). The upper ends of the four L-shaped rods (453) are hinged to the bottom of the lifting platform (44). The cylinder (451) is horizontally mounted on the base frame (43), and the cylinder rod is hinged to one of the L-shaped rods (453).
9. A glass printing detection mechanism according to claim 1 or 2, characterized in that: The printing section (2) also includes an optical fiber switch for detecting the position of the glass, and the optical fiber switch is connected to the second positioning cylinder (23) and the printing device (24).
10. A glass printing detection mechanism according to claim 1 or 2, characterized in that: The number of the first positioning cylinder (13), the second positioning cylinder (23), and the third positioning cylinder (54) is two or three.