A kind of lifting cantilever crane adopting rack transmission

Abstract

The present invention discloses a liftable cantilever crane adopting rack transmission, and the present invention relates to the technical field of industrial components. The present invention can be realized by installing a warning frame at the bottom of the first steel wire rope at the lower end of the electric hoist, and arranging a force plate inside the warning frame, and hanging an object through a hook at the bottom of the force plate. During the hanging process, the gravity of the object is the same as the pressure of the force plate pressing down. A plurality of gravity detection balls are arranged at the bottom of the force plate. When the hanging object exceeds a certain value, the outer shell of the gravity detection ball is broken, so that the colored pigment flows out and gathers inside the transparent retaining ring. The staff can check whether the colored pigment is leaked by the naked eye to determine whether the hanging object is overweight. After the colored pigment leaks, the staff will start and stop the cantilever crane in time, strengthen the protection of the cantilever crane, improve the quality and service life of the cantilever and the electric hoist, and reduce the use cost of the cantilever crane.

Description

Technical Field

[0001] The invention relates to the technical field of industrial components, in particular to a liftable cantilever crane using a rack transmission. Background Art

[0002] Cantilever crane is an industrial component and a light-duty crane. It consists of a column, a slewing arm rotation drive device and an electric hoist. It has light weight, large span, large lifting capacity, economy and durability. The cantilever crane has light working strength. The crane consists of a column, a slewing arm rotation drive device and an electric hoist.

[0003] The lower end of the existing cantilever hanging column is fixed to the concrete foundation by anchor bolts, and the cantilever is driven to rotate by a cycloidal pinwheel reduction device. The electric hoist is controlled by a rack on the cantilever I-beam to run in a straight line left and right and lift heavy objects.

[0004] When an existing cantilever crane is working, if it hoists objects that exceed its maximum load-bearing range, it will cause damage to the electric hoist and the cantilever, causing the cantilever to bend after long-term use, and the electric hoist to be damaged and unusable, thereby reducing the quality and service life of the cantilever crane and increasing the use cost and maintenance cost of the cantilever crane. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a liftable cantilever crane using a rack transmission, which solves the problem of damage to the cantilever crane caused by overweight hoisted objects.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a liftable cantilever crane using rack transmission, comprising a liftable column, a movable rod is movably connected to the upper end of the liftable column, a cantilever is movably connected to the right side of the upper end of the movable rod, limiting grooves are provided at the front and rear ends of the cantilever, racks are movably connected inside the limiting grooves, a connecting plate is fixedly connected to the lower end of the rack, an electric hoist is fixedly connected to the lower end of the connecting plate, a first steel wire rope is provided at the lower end of the electric hoist, a warning frame is installed at the lower end of the first steel wire rope, a second steel wire rope is installed at the lower end of the warning frame, and a hook is fixedly connected to the lower end of the second steel wire rope. The object to be suspended can be lifted upward through the hook, and the electric hoist is started to achieve lifting, and at the same time, the weight of the hoisted object can be monitored through the warning frame.

[0007] Preferably, a slide groove that passes through the limit groove and the cantilever is provided at the bottom of the limit groove, and two connecting columns are fixedly connected to the upper end of the connecting plate. The connecting plate is fixedly connected to the rack through the connecting columns, and the connecting column is movably clamped inside the slide groove. When in use, when the rack moves, the connecting column and the connecting plate can be driven to move at the same time. The rack can be limited by placing the connecting column inside the slide groove.

[0008] Preferably, the warning frame includes two circular fixing plates and a plurality of support columns, and the plurality of support columns are distributed on the inner sides of the two circular fixing plates in a circular array manner, and the support columns are fixedly connected to the circular fixing plates, and a limiting ring is fixedly connected to the middle part of the upper end of the upper circular fixing plate, and a connecting ring is fixedly connected to the lower end of the first steel wire rope, and the connecting ring is movably connected to the limiting ring. When in use, the warning frame is fixed to the lower end of the first steel wire rope by connecting the connecting ring to the limiting ring, thereby realizing the installation and fixation of the warning frame.

[0009] Preferably, a circular groove is provided in the middle of the circular fixed plate at the lower end, a sealing ring is provided on the inner side of the circular groove, a fixing rod is provided on the upper end of the second steel wire rope, the fixing rod is inserted into the circular groove, the diameter of the fixing rod matches the inner diameter of the circular groove, and a force-bearing plate is fixedly connected to the upper end of the fixing rod. When in use, the force-bearing plate is located inside the warning frame. When the hook lifts a heavy object, the force-bearing plate is pressed downward by gravity, exerting pressure on the bottom circular fixed plate.

[0010] Preferably, a transparent retaining ring is fixedly connected to the outer side of the upper end of the circular fixed plate at the lower end, and the transparent retaining ring is located on the inner side of the support column. The transparent retaining ring is made of transparent acrylic material. When in use, the colored pigment flows out after the gravity detection ball is broken. The transparent retaining ring made of transparent acrylic material can prevent the colored pigment from leaking out of the warning frame, and is convenient for staff to observe and serve as a warning.

[0011] Preferably, two groups of gravity detection balls distributed in a surrounding array are provided at the bottom of the force-bearing plate, and the number of gravity detection balls in each group is multiple, a magnetic sheet is provided inside the force-bearing plate, a magnetic block is provided at the upper end of the gravity detection ball, and the magnetic block is magnetically connected to the magnetic sheet. When in use, the gravity detection ball is magnetically fixed to the bottom of the force-bearing plate by the magnetic block and the magnetic sheet, and the gravity detection ball is replaceable.

[0012] Preferably, a shell is provided on the outside of each of the multiple gravity detection balls, and the inside of the shell is filled with colored pigment. The material of the shell is polyurethane foam material. When in use, the shell made of polyurethane foam material can withstand a maximum weight of 100KG. In the process of the gravity detection ball supporting the force plate, when the gravity pressed down by the force plate is greater than 100KG, the shell is broken, and the colored pigment inside the shell flows out into the transparent retaining ring. When the staff checks that the colored pigment is leaking, it means that the lifting object is overweight and the suspension arm needs to be stopped immediately.

[0013] Preferably, a plurality of the gravity detection balls are each provided with a support block, and the support block is located at the lower end of the magnetic block, the support block is made of lime paste material, and a high-density mesh is provided on the outside of the support block, and the density of the high-density mesh is smaller than the diameter of the lime paste particles. When in use, when the colored pigment leaks, the support block contacts the air, and the support block made of the lime paste hardens to support the force plate and strengthen the protection of the warning frame, and the high-density mesh can completely wrap the lime paste particles inside to avoid leakage of the lime paste particles that makes it difficult to clean.

[0014] Preferably, an angle adjustment component is installed at the upper end of the outer side of the liftable column, and the angle adjustment component includes a gear ring, which is arranged at the upper end of the outer side of the liftable column, and the upper end of the outer side of the liftable column is movably connected with a movable connecting piece, and the movable connecting piece is arranged at the lower end of the gear ring, and a gear is movably connected to the upper end of the right side of the movable connecting piece, and the gear and the gear ring are meshingly connected, and a push rod is fixedly connected to the middle part of the gear, and the upper end of the push rod is fixedly connected to the cantilever, and the push rod is movably inserted in the movable connecting piece, and a servo motor is installed at the lower end of the push rod, and an output shaft is arranged in the middle part of the upper end of the servo motor, and the output shaft is fixedly connected to the push rod. When in use, starting the servo motor can drive the gear to rotate, and at the same time, the gear rotates and meshes with the gear ring to rotate around the outer side of the gear ring, thereby realizing the cantilever angle adjustment.

[0015] The present invention provides a scissor-type cantilever crane using rack transmission. Compared with the prior art, it has the following beneficial effects:

[0016] (1) The present invention can be realized by installing a warning frame at the bottom of the first steel wire rope at the lower end of the electric hoist, and arranging a force plate inside the warning frame, and hanging objects through the hook at the bottom of the force plate. During the hanging process, the gravity of the object is the same as the downward pressure of the force plate. A plurality of gravity detection balls are arranged at the bottom of the force plate. When the hanging object exceeds a certain value, the outer shell of the gravity detection ball is broken, so that the colored pigment flows out and gathers inside the transparent retaining ring. The staff can check with the naked eye whether the colored pigment has leaked to determine whether the hanging object is overweight. After the colored pigment leaks, the staff can start and stop the cantilever crane in time, thereby strengthening the protection of the cantilever crane, improving the quality and service life of the cantilever and the electric hoist, and reducing the use cost of the cantilever crane.

[0017] (2) A circular groove is provided in the middle of the circular fixing plate at the lower end, and a sealing ring is provided inside the circular groove. A fixing rod is provided at the upper end of the second steel wire rope, and the fixing rod is inserted into the circular groove. The diameter of the fixing rod matches the inner diameter of the circular groove. A force-bearing plate is fixedly connected to the upper end of the fixing rod, and the force-bearing plate is located inside the warning frame. When the hook lifts a heavy object, the force-bearing plate is pressed downward by gravity, exerting pressure on the bottom circular fixing plate.

[0018] (3) A transparent retaining ring is fixedly connected to the outer side of the upper end of the lower circular fixed plate, and the transparent retaining ring is located on the inner side of the support column. The transparent retaining ring is made of transparent acrylic material. When the gravity detection ball is broken, the colored pigment flows out. The transparent retaining ring made of transparent acrylic material can prevent the colored pigment from leaking outside the warning frame, and is convenient for staff to observe and serve as a warning.

[0019] (4) Two groups of gravity detection balls distributed in a surrounding array are arranged at the bottom of the force-bearing plate, and each group of gravity detection balls has multiple balls. A magnetic sheet is arranged inside the force-bearing plate, and a magnetic block is arranged at the upper end of the gravity detection ball. The magnetic block is magnetically connected to the magnetic sheet. The gravity detection ball is fixed to the bottom of the force-bearing plate by magnetic attraction of the magnetic block and the magnetic sheet, and the gravity detection ball is replaceable.

[0020] (5) Multiple gravity detection balls are provided with an outer shell on the outside, and the inside of the shell is filled with colored pigment. The material of the outer shell is polyurethane foam material, and the outer shell made of polyurethane foam material can withstand a maximum weight of 100KG. When the gravity detection ball supports the load-bearing plate, when the gravity pressed down by the load-bearing plate is greater than 100KG, the outer shell breaks and the colored pigment inside the outer shell flows out into the transparent retaining ring. When the staff finds that the colored pigment is leaking, it means that the hoisting object is overweight and the suspension arm needs to be stopped immediately.

[0021] (6) A support block is provided inside each of the multiple gravity detection balls, and the support block is located at the lower end of the magnetic block. The support block is made of lime paste material, and a high-density net is provided on the outside of the support block. The density of the high-density net is smaller than the diameter of the lime paste particles. When the colored pigment leaks, the support block contacts the air, and the support block made of the lime paste hardens to support the force plate and strengthen the protection of the warning frame. The high-density net can completely wrap the lime paste particles inside to avoid leakage of the lime paste particles that makes cleaning difficult. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the warning frame and the hook in the present invention.

[0024] Figure 3 It is a structural schematic diagram of the warning frame in the present invention.

[0025] Figure 4 It is a structural schematic diagram of the load-bearing plate in the present invention.

[0026] Figure 5 It is a schematic diagram of the bottom structure of the load-bearing plate in the present invention.

[0027] Figure 6 It is a schematic diagram of the structure of the gravity detection ball in the present invention.

[0028] Figure 7 It is a cross-sectional view of the gravity detection ball in the present invention.

[0029] In the figure: 1. liftable column; 1001. movable rod; 2. cantilever; 3. limit groove; 31. slide groove; 4. rack; 5. connecting plate; 6. electric hoist; 61. first steel wire rope; 62. connecting ring; 7. warning frame; 71. circular fixing plate; 72. support column; 73. circular groove; 74. sealing ring; 75. limit ring; 8. transparent retaining ring; 9. fixing rod; 10. force plate; 101. magnetic sheet; 11. gravity detection ball; 111. shell; 112. colored pigment; 113. magnetic block; 114. high-density net; 115. support block; 12. second steel wire rope; 13. hook; 14. angle adjustment assembly; 141. gear ring; 142. movable connecting piece; 143. gear; 144. push rod; 145. servo motor. Implementation

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments 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 embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1 The embodiment of the present invention provides a technical solution: a jack-type cantilever crane using a rack transmission, comprising a jack-type column 1, a movable rod 1001 is movably connected to the upper end of the jack-type column 1, a cantilever 2 is movably connected to the upper right side of the movable rod 1001, a limit slot 3 is provided at the front and rear ends of the cantilever 2, a rack 4 is movably connected to the limit slot 3, a connecting plate 5 is fixedly connected to the lower end of the rack 4, an electric hoist 6 is fixedly connected to the lower end of the connecting plate 5, a first steel wire rope 61 is provided at the lower end of the electric hoist 6, a warning frame 7 is installed at the lower end of the first steel wire rope 61, a second steel wire rope 12 is installed at the lower end of the warning frame 7, and a hook 13 is fixedly connected to the lower end of the second steel wire rope 12. The object to be suspended can be lifted upward through the hook 13, and the electric hoist 6 is started to achieve lifting. At the same time, the weight of the hoisted object is monitored through the warning frame 7. The electric hoist 6 and the rack 4 are prior arts known to those skilled in the art, and their specific structures, connection relationships and functional principles are not repeated here.

[0032] A slide groove 31 that passes through the limit groove 3 and the cantilever 2 is provided at the bottom of the limit groove 3. Two connecting columns are fixedly connected to the upper end of the connecting plate 5. The connecting plate 5 is fixedly connected to the rack 4 through the connecting columns. The connecting columns are movably clamped inside the slide groove 31. When in use, when the rack 4 moves, the connecting columns and the connecting plate 5 can be driven to move at the same time. By placing the connecting columns inside the slide groove 31, the rack 4 can be limited to improve the stability of the rack 4.

[0033] See also Figure 2-3 The warning frame 7 includes two circular fixing plates 71 and multiple support columns 72. The multiple support columns 72 are distributed on the inner sides of the two circular fixing plates 71 in a ring array manner, and the support columns 72 are fixedly connected to the circular fixing plates 71. The middle part of the upper end of the upper circular fixing plate 71 is fixedly connected to a limiting ring 75. The lower end of the first steel wire rope 61 is fixedly connected to a connecting ring 62. The connecting ring 62 is movably connected to the limiting ring 75. When in use, the warning frame 7 is fixed to the lower end of the first steel wire rope 61 by connecting the connecting ring 62 with the limiting ring 75, so as to realize the installation and fixation of the warning frame 7.

[0034] See also Figure 2-4 A circular groove 73 is provided in the middle of the circular fixing plate 71 at the lower end, and a sealing ring 74 is provided inside the circular groove 73. A fixing rod 9 is provided at the upper end of the second steel wire rope 12, and the fixing rod 9 is inserted into the circular groove 73. The diameter of the fixing rod 9 matches the inner diameter of the circular groove 73. A force-bearing plate 10 is fixedly connected to the upper end of the fixing rod 9. When in use, the force-bearing plate 10 is located inside the warning frame 7. When the hook 13 lifts a heavy object, the force-bearing plate 10 is pressed down by gravity, exerting pressure on the bottom circular fixing plate 71.

[0035] A transparent retaining ring 8 is fixedly connected to the outer side of the upper end of the lower circular fixed plate 71, and the transparent retaining ring 8 is located on the inner side of the support column 72. The transparent retaining ring 8 is made of transparent acrylic material. When in use, the colored pigment 112 flows out after the gravity detection ball 11 is broken. The transparent retaining ring 8 made of transparent acrylic material can prevent the colored pigment 112 from leaking out of the warning frame 7, and is convenient for staff to observe and serve as a warning.

[0036] See also Figure 4-7 Two groups of gravity detection balls 11 distributed in a surrounding array are arranged at the bottom of the force-bearing plate 10, and the number of gravity detection balls 11 in each group is multiple. A magnetic sheet 101 is arranged inside the force-bearing plate 10, and a magnetic block 113 is arranged at the upper end of the gravity detection ball 11. The magnetic block 113 is magnetically connected to the magnetic sheet 101. When in use, the gravity detection ball 11 is magnetically fixed to the bottom of the force-bearing plate 10 by the magnetic block 113 and the magnetic sheet 101, and the gravity detection ball 11 is replaceable.

[0037] A shell 111 is provided on the outside of multiple gravity detection balls 11, and the inside of the shell 111 is filled with colored pigment 112. The material of the shell 111 is polyurethane foam material. When in use, the shell 111 made of polyurethane foam material can withstand a maximum weight of 100KG. In the process of the gravity detection ball 11 supporting the force plate 10, when the gravity pressed down by the force plate 10 is greater than 100KG, the shell 111 is broken, and the colored pigment 112 inside the shell 111 flows out into the transparent retaining ring 8. When the staff checks that the colored pigment 112 is leaking, it means that the lifting object is overweight and the suspension arm needs to be stopped immediately.

[0038] A support block 115 is provided inside each of the multiple gravity detection balls 11, and the support block 115 is located at the lower end of the magnetic block 113. The support block 115 is made of lime paste. A high-density mesh 114 is provided on the outside of the support block 115. The density of the high-density mesh 114 is less than the diameter of the lime paste particles. When in use, when the colored pigment 112 leaks, the support block 115 contacts the air, and the support block 115 made of lime paste hardens to support the force plate 10 and strengthen the protection of the warning frame 7. The high-density mesh 114 can completely wrap the lime paste particles inside to avoid leakage of the lime paste particles that makes it difficult to clean.

[0039] See also Figure 1 The upper end of the outer side of the liftable column is equipped with an angle adjustment component 14, which includes a gear ring 141, which is arranged at the upper end of the outer side of the liftable column, and the upper end of the outer side of the liftable column is movably connected with a movable connecting member 142, and the movable connecting member 142 is arranged at the lower end of the gear ring 141, and the upper right end of the movable connecting member 142 is movably connected with a gear 143, and the gear 143 is meshed with the gear ring 141, and a push rod 144 is fixedly connected to the middle of the gear 143, and the push rod 1 The upper end of 44 is fixedly connected to the cantilever 2, and the push rod 144 is movably inserted in the movable connecting piece 142. A servo motor 145 is installed at the lower end of the push rod 144. An output shaft is set in the middle of the upper end of the servo motor 145. The output shaft is fixedly connected to the push rod 144. When in use, the servo motor 145 is started to drive the gear 143 to rotate. At the same time, the gear 143 rotates and engages with the ring gear 141 to rotate around the outer side of the ring gear 141, so as to adjust the angle of the cantilever 2 and facilitate the use of the cantilever 2.

[0040] The working principle of the present invention is: first move the device to the position where it needs to be used, then connect the device to the power supply, lift the object to be suspended upward through the hook 13, start the electric hoist 6 to achieve lifting, when the hook 13 lifts the heavy object, the force-bearing plate 10 is pressed down by gravity, and pressure is applied to the bottom circular fixed plate 71, and the shell 111 made of polyurethane foam material can withstand a maximum weight of 100KG. In the process of the gravity detection ball 11 supporting the force-bearing plate 10, when the gravity of the force-bearing plate 10 pressing down is greater than 100KG, the shell 111 is broken, and the colored pigment 112 inside the shell 111 flows out into the transparent retaining ring 8. When the staff finds that the colored pigment 112 is leaking, it means that the hoisting object is overweight and the suspension arm needs to be stopped immediately. When the colored pigment 112 leaks, the support block 115 contacts the air, and the support block 115 made of lime paste hardens, supports the force-bearing plate 10, and strengthens the protection of the warning frame 7.

[0041] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liftable cantilever crane using a rack drive, comprising a liftable column (1), Features: The upper end of the liftable column (1) is movably connected to a movable rod (1001), the upper right side of the movable rod (1001) is movably connected to a cantilever (2), the front and rear ends of the cantilever (2) are provided with limit slots (3), the limit slots (3) are movably connected to racks (4), the lower end of the rack (4) is fixedly connected to a connecting plate (5), the lower end of the connecting plate (5) is fixedly connected to an electric hoist (6), the lower end of the electric hoist (6) is provided with a first steel wire rope (61), the lower end of the first steel wire rope (61) is installed with a warning frame (7), the lower end of the warning frame (7) is installed with a second steel wire rope (12), and the lower end of the second steel wire rope (12) is fixedly connected to a hook (13); The bottom of the limit groove (3) is provided with a slide groove (31) which penetrates the limit groove (3) and the cantilever (2); the upper end of the connecting plate (5) is fixedly connected to two connecting columns; the connecting plate (5) is fixedly connected to the rack (4) via the connecting columns; the connecting columns are movably clamped in the slide groove (31); The warning frame (7) comprises two circular fixing plates (71) and a plurality of support columns (72), wherein the plurality of support columns (72) are distributed on the inner sides of the two circular fixing plates (71) in a circular array manner, and the support columns (72) are fixedly connected to the circular fixing plates (71), and a limiting ring (75) is fixedly connected to the middle of the upper end of the upper circular fixing plate (71), and a connecting ring (62) is fixedly connected to the lower end of the first steel wire rope (61), and the connecting ring (62) is movably connected to the limiting ring (75); A circular groove (73) is provided in the middle of the circular fixing plate (71) at the lower end, a sealing ring (74) is provided inside the circular groove (73), a fixing rod (9) is provided at the upper end of the second steel wire rope (12), the fixing rod (9) is inserted into the circular groove (73), the diameter of the fixing rod (9) matches the inner diameter of the circular groove (73), and the upper end of the fixing rod (9) is fixedly connected to a force-bearing plate (10); A transparent retaining ring (8) is fixedly connected to the outer side of the upper end of the circular fixing plate (71) at the lower end, and the transparent retaining ring (8) is located at the inner side of the supporting column (72); Two groups of gravity detection balls (11) distributed in a surrounding array are arranged at the bottom of the force-bearing plate (10), and each group of gravity detection balls (11) has a plurality of balls. A magnetic sheet (101) is arranged inside the force-bearing plate (10), and a magnetic block (113) is arranged at the upper end of the gravity detection ball (11), and the magnetic block (113) is magnetically connected to the magnetic sheet (101); A shell (111) is disposed outside each of the plurality of gravity detection balls (11), and the inside of the shell (111) is filled with a colored pigment (112); A support block (115) is disposed inside each of the plurality of gravity detection balls (11), and the support block (115) is located at the lower end of the magnetic block (113). The support block (115) is made of lime paste material, and a high-density net (114) is disposed outside the support block (115). The density of the high-density net (114) is less than the diameter of the lime paste particles.

2. The jack-and-pinion cantilever crane according to claim 1, Features: The transparent retaining ring (8) is made of transparent acrylic material, and the outer shell (111) is made of polyurethane foam material.

3. The jack-type cantilever crane with rack transmission according to claim 1, Features: An angle adjustment assembly (14) is installed at the upper outer end of the liftable column (1), and the angle adjustment assembly (14) comprises a gear ring (141), and the gear ring (141) is arranged at the upper outer end of the liftable column, and the upper outer end of the liftable column is movably connected to a movable connecting member (142), and the movable connecting member (142) is arranged at the lower end of the gear ring (141), and the upper right end of the movable connecting member (142) is movably connected to a gear (143), and the gear The gear (143) is meshingly connected with the ring gear (141); a push rod (144) is fixedly connected to the middle of the gear (143); the upper end of the push rod (144) is fixedly connected to the cantilever (2); the push rod (144) is movably inserted into the movable connecting member (142); a servo motor (145) is installed at the lower end of the push rod (144); an output shaft is provided in the middle of the upper end of the servo motor (145); and the output shaft is fixedly connected to the push rod (144).

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