Jacking device

Abstract

The utility model relates to the field of jacking machinery, and provides a jacking device. The jacking device comprises a shell, a jacking table, a jacking assembly and a driving rod. A first mounting hole extending in the vertical direction is formed in the upper side of the shell, a second mounting hole extending in the front-back direction is formed in the front side of the shell, and the second mounting hole is communicated with the first mounting hole. The jacking table is arranged on the upper side of the shell. The jacking assembly comprises a screw rod and a nut, the nut is rotatably mounted in the first mounting hole and limited to move up and down, the screw rod extends in the up-down direction and is in threaded connection with the interior of the nut, and the upper end of the screw rod is connected with the jacking table. The driving rod is rotatably mounted in the second mounting hole, the rear end of the driving rod is in transmission connection with the nut, and the driving rod rotates to drive the nut to rotate. According to the jacking device, jacking operation can be achieved, the jacking device can be in flat and large-area contact with a stressed part through the jacking table in the operation period, slipping is not prone to occurring, and therefore the risk that an operator is subjected to mechanical injuries and the risk that equipment is damaged can be reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of jacking machinery, and particularly relates to a jacking device. BACKGROUND

[0002] In the process of replacing the cylinder of a refueling machine in a nuclear power plant, the height of the connection between the cylinder driving rod and the finger sleeve pipe needs to be adjusted to an appropriate height under different working conditions so as to facilitate the disassembly or reassembly of the driving rod and the finger sleeve pipe, thereby facilitating the replacement of the cylinder. In this regard, in some cases, an operating personnel uses a crowbar to adjust the height of the connection between the driving rod and the finger sleeve pipe on site. However, the contact area of the crowbar with the force receiving part is small, which causes the crowbar to easily slip off, thereby increasing the risk of mechanical injury to the operating personnel and the risk of equipment damage. CONTENT OF THE UTILITY MODEL

[0003] The application provides a jacking device, and aims to solve the problem of increased risk of mechanical injury to an operating personnel and increased risk of equipment damage in the prior height adjustment mode.

[0004] To achieve the above object, the technical scheme adopted by the embodiments of the application is as follows: a jacking device, comprising:

[0005] a shell, an upper side of the shell being provided with a first mounting hole extending in the up-down direction, a front side of the shell being provided with a second mounting hole extending in the front-rear direction, the second mounting hole being in communication with the first mounting hole;

[0006] a jacking table arranged on the upper side of the shell;

[0007] a jacking assembly, comprising a screw rod and a nut, the nut being rotatably mounted in the first mounting hole and being limited to move up and down, the screw rod extending in the up-down direction and being threadedly connected to the nut, an upper end of the screw rod being connected to the jacking table;

[0008] a driving rod rotatably mounted in the second mounting hole, a rear end of the driving rod being in transmission connection with the nut, the rotation of the driving rod being capable of driving the rotation of the nut.

[0009] In some embodiments, the first mounting hole is located on one side of the second mounting hole in the left-right direction, the shell is provided with a third mounting hole, the third mounting hole extending in the left-right direction and being in communication with the first mounting hole and the second mounting hole;

[0010] the nut is a worm nut, the jacking assembly further comprises a worm, the worm being rotatably mounted in the third mounting hole and being in meshing connection with the worm nut, the rear end of the driving rod being provided with a driving bevel gear, one end of the worm close to the driving rod being provided with a driven bevel gear, the driven bevel gear being in meshing connection with the driving bevel gear.

[0011] In some embodiments, the third mounting hole is in communication with the outside of the shell at one end away from the second mounting hole, and the jacking device comprises a first gland connected to the outside of the shell and covering the opening of the third mounting hole.

[0012] In some embodiments, the worm comprises, in sequence in a direction away from the second mounting hole, a first mounting portion, a first sleeve portion, an engaging portion, and a second sleeve portion, the driven bevel gear is mounted on the first mounting portion, and the engaging portion is engaged with the worm nut.

[0013] The jacking assembly comprises a first bearing and a second bearing, the first bearing is sleeved on the first sleeve portion and is located between the driven bevel gear and the engaging portion, and the second bearing is sleeved on the second sleeve portion and is located between the engaging portion and the first gland.

[0014] In some embodiments, two jacking assemblies are provided, the two jacking assemblies are arranged on the left and right sides of the drive rod, the driven bevel gears of the two jacking assemblies are engaged with the driving bevel gear, and the screw rods of the two jacking assemblies are connected to the jacking table.

[0015] In some embodiments, the nut comprises, in sequence from top to bottom, a first end portion, a main body portion, and a second end portion; the jacking assembly comprises a third bearing, the third bearing is sleeved on the second end portion and is located between the main body portion and the bottom of the first mounting hole; and the jacking device comprises a second gland, the second gland is sleeved between the first end portion and the first mounting hole and limits the up-and-down movement of the main body portion.

[0016] In some embodiments, the bottom of the first mounting hole is provided with a through hole, the through hole is arranged in alignment with the threaded hole of the nut in the up-and-down direction, and the through hole can allow the partial screw rod to pass therethrough.

[0017] In some embodiments, the rear end of the drive rod is provided with a driving bevel gear, a plurality of fourth bearings and a plurality of positioning cylinders are sleeved between the drive rod and the second mounting hole, the driving bevel gear and the fourth bearing arranged adjacent thereto are spaced by the positioning cylinder, and the fourth bearings arranged adjacent to each other are spaced by the positioning cylinder.

[0018] The jacking device comprises a third gland, the third gland is sleeved between the drive rod and the second mounting hole and abuts against the fourth bearing arranged adjacent thereto.

[0019] In some embodiments, the jacking device comprises a sleeve mounted on the second mounting hole, and a part of the driving rod is arranged in the sleeve.

[0020] In some embodiments, the front end of the driving rod is provided with a spanner part.

[0021] In some embodiments, the jacking platform comprises a support part connected with the screw rod, and an extension part connected to a circumferential side of the support part, and the upper side of the extension part is lower than the upper side of the support part.

[0022] The jacking device provided by the present application has the following advantages:

[0023] The jacking device provided by the present application has the following advantages:

[0024] In the process of replacing the cylinder of the refueling machine of the nuclear power plant, the jacking device can be placed between the emergency disengaging gear of the main lifting device of the refueling machine and the bottom flange surface located at the bottom side of the emergency disengaging gear, and the jacking platform is directed towards the emergency disengaging gear. Based on this, the driving rod can be driven manually or electrically to rotate, so as to drive the nut to rotate through the transmission connection between the driving rod and the nut. Based on the rotation of the nut and the threaded connection relationship between the nut and the screw rod, the screw rod is moved up and down relative to the nut, so as to drive the jacking platform to move up and down relative to the shell through the screw rod. In this way, the jacking device can conveniently and reliably jack the emergency disengaging gear through the jacking platform, so as to adjust the height of the connection between the cylinder driving rod and the finger sleeve pipe, thereby facilitating the replacement of the cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The jacking device provided by the present application has the following advantages:

[0027] Figure 2 The jacking device provided by the present application has the following advantages: Figure 1 The jacking device provided by the present application has the following advantages:

[0028] Figure 3 provided is a sectional view along A-A; Figure 2 provided is a sectional view along A-A;

[0029] Figure 4 provided is a sectional view along A-A; Figure 3 provided is a sectional view along B-B;

[0030] Figure 5 provided is a sectional view along B-B; Figure 1 provided is an exploded schematic view of the jacking device.

[0031] In the drawings:

[0032] 10 - housing, 11 - first mounting hole, 12 - second mounting hole, 13 - third mounting hole, 14 - through hole; 20 - jacking platform, 21 - support part, 22 - extension part; 30 - jacking assembly, 31 - screw rod, 32 - nut, 321 - first end part, 322 - main body part, 323 - second end part, 324 - threaded hole; 33 - worm, 331 - first mounting part, 332 - first sleeve part, 333 - meshing part, 334 - second sleeve part; 34 - driven bevel gear, 35 - first bearing, 36 - second bearing, 37 - third bearing; 40 - driving rod, 41 - driving bevel gear, 42 - wrench part; 50 - first gland, 60 - second gland, 70 - fourth bearing, 80 - positioning cylinder, 90 - third gland, 100 - sleeve. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects of the present application clear, the present application will be described in detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0034] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] It should also be noted that in the embodiments of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Figure 1The XYZ rectangular coordinate system established in the middle defines: the side located in the positive direction of the X-axis as the front, the side located in the negative direction of the X-axis as the back; the side located in the positive direction of the Y-axis as the left, the side located in the negative direction of the Y-axis as the right; the side located in the positive direction of the Z-axis as the top, and the side located in the negative direction of the Z-axis as the bottom.

[0036] In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] During the cylinder replacement process of the refueling machine of the nuclear power plant, the height of the connection between the cylinder drive rod and the finger sleeve pipe needs to be adjusted to the appropriate height under different working conditions, so as to facilitate the disassembly or reassembly of the drive rod and the finger sleeve pipe, thereby facilitating the cylinder replacement.

[0039] In this regard, in some cases, the operator will use a crowbar to adjust the height of the connection between the drive rod and the finger sleeve pipe on site. However, the contact area of the crowbar with the force receiving part (such as the gear engagement disc connected to the bottom end of the drive rod) is small, which causes the crowbar to slip off easily, increasing the risk of mechanical injury (such as hand clamping) to the operator and the risk of equipment damage. Moreover, the adjustment accuracy of the crowbar is poor and it is easy to slip off, which requires repeated adjustment and adjustment, increasing the working time of the operator on site and the radiation dose of the operator in the irradiation environment and radioactive environment.

[0040] In other cases, the height of the connection between the drive rod and the finger sleeve pipe can be adjusted by adjusting the gas supply of the cylinder. However, during the adjustment, there may be accidental gas loss, which may cause the operator to be mechanically injured (such as hand clamping) due to the sudden drop of the drive rod and the parts connected to the drive rod. Moreover, the adjustment accuracy of this adjustment method is low, and repeated adjustment and adjustment are required, which increases the working time of the operator on site and the radiation dose of the operator in the irradiation environment and radioactive environment.

[0041] Thus, the jacking device provided by the embodiments of the present application can conveniently, quickly, flexibly, controllably and reliably realize jacking operation. During operation, the jacking device can be in flat and large-area contact with the force receiving component via the jacking platform, and is not easy to slip off, thereby reducing the risk of mechanical injury (e.g. pinching hands) and the risk of equipment damage of the operator. Moreover, the jacking device has high adjustment accuracy, can quickly and accurately realize height adjustment, can reduce the number of repeated adjustment and adjustment of the operator on site, can reduce the working time of the operator on site, can reduce the radiation dose of the operator in the irradiation environment and radioactive environment, can protect the operator himself, and can improve the operation safety.

[0042] The jacking device disclosed by the embodiments of the present application can be applied to many scenes requiring jacking operation, and can be particularly applied to assisting in replacing the cylinder of the refueling machine of the nuclear power plant. That is, during the replacement of the cylinder of the refueling machine of the nuclear power plant, the jacking device disclosed by the embodiments of the present application can be used to adjust the height of the connection between the cylinder driving rod and the finger sleeve to a suitable height, so as to facilitate the disassembly or reassembly of the driving rod and the finger sleeve, thereby facilitating the replacement of the cylinder.

[0043] In order to illustrate the technical solutions provided by the present application, the following will be described in detail in combination with specific drawings and embodiments, and taking "jacking device for assisting in replacing the cylinder of the refueling machine of the nuclear power plant" as an example.

[0044] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 Some embodiments of the present application provide a jacking device, which comprises a shell 10, a jacking platform 20, a jacking assembly 30 and a driving rod 40. The upper side of the shell 10 is provided with a first mounting hole 11 extending in the up-down direction, and the front side of the shell 10 is provided with a second mounting hole 12 extending in the front-rear direction, which is in communication with the first mounting hole 11. The jacking platform 20 is arranged on the upper side of the shell 10. The jacking assembly 30 comprises a screw rod 31 and a nut 32, the nut 32 is rotatably installed in the first mounting hole 11 and is limited to move up and down, the screw rod 31 extends in the up-down direction and is threadedly connected to the nut 32, and the upper end of the screw rod 31 is connected to the jacking platform 20. The driving rod 40 is rotatably installed in the second mounting hole 12, the rear end of the driving rod 40 is in transmission connection with the nut 32, and the rotation of the driving rod 40 can drive the nut 32 to rotate.

[0045] It should be noted that the upper side of the shell 10 is provided with the first mounting hole 11, the first mounting hole 11 extends in the up-down direction, and the upper hole of the first mounting hole 11 is in communication with the outside of the shell 10. In some embodiments, the first mounting hole 11 can be a circular hole.

[0046] The nut 32 is installed in the first mounting hole 11, and the nut 32 is restricted to move up and down in the first mounting hole 11, that is, the axial position of the nut 32 relative to the first mounting hole 11 is stable. The nut 32 can rotate around the axis thereof in the first mounting hole 11, that is, the nut 32 has a freedom of circumferential rotation. The nut 32 is annular and has a threaded hole 324.

[0047] The screw rod 31 is arranged to extend in the up-down direction, and the screw rod 31 is threadedly connected to the threaded hole 324 of the nut 32. That is, the outer periphery of the screw rod 31 is provided with external threads, and the hole wall of the threaded hole 324 of the nut 32 is provided with internal threads, and the screw rod 31 is threadedly connected to the internal threads of the threaded hole 324 via the external threads. In the process of rotating the nut 32 around the axis thereof, the screw rod 31 can move up and down (that is, lift) relative to the nut 32 based on the threaded connection therebetween. The upper end of the screw rod 31 is connected to the jacking table 20 located on the upper side of the housing 10, and the connection manner can adopt but is not limited to bolt connection, welding, etc. In the process of moving the screw rod 31 up and down relative to the nut 32, the jacking table 20 can be driven by the screw rod 31 to move up and down relative to the housing 10.

[0048] The first mounting hole 11 is arranged in the number corresponding to the number of the nut 32, and also corresponds to the number of the screw rod 31. According to needs, the matched first mounting hole 11, nut 32 and screw rod 31 can be arranged in one or more groups.

[0049] The housing 10 is made of a rigid material, so that the housing 10 has certain rigidity and strength, and can form a protective effect on the components installed therein. In some embodiments, the housing 10 can be a metal housing 10.

[0050] It should be further pointed out that the front side of the housing 10 is provided with a second mounting hole 12, and the second mounting hole 12 is arranged to extend in the front-rear direction, and the front aperture of the second mounting hole 12 is communicated to the outside of the housing 10. In some embodiments, the second mounting hole 12 can be a circular hole.

[0051] The second mounting hole 12 is communicated with the first mounting hole 11. In some cases, the first mounting hole 11 and the second mounting hole 12 are arranged in alignment in the front-rear direction, and the second mounting hole 12 is directly communicated with the first mounting hole 11. In other cases, the first mounting hole 11 and the second mounting hole 12 are arranged in misalignment in the front-rear direction, and the second mounting hole 12 is indirectly communicated with the first mounting hole 11 via other holes (for example, the third mounting hole 13 below).

[0052] The driving rod 40 is arranged to extend along the front-rear direction, is installed in the second mounting hole 12, and can rotate around the axis thereof in the second mounting hole 12. The number of the second mounting holes 12 corresponds to the number of the driving rods 40. In some embodiments, a set of the second mounting holes 12 and the driving rods 40 can be arranged for ease of operation.

[0053] The rear end of the driving rod 40 is in transmission connection with the nut 32, so that the rotation of the driving rod 40 can drive the nut 32 to rotate. The transmission connection between the driving rod 40 and the nut 32 can be achieved by, but is not limited to, a bevel gear, a worm gear, a chain transmission, a belt transmission, etc.

[0054] In some cases, the front end of the driving rod 40 can be held by an operator to manually drive the driving rod 40 to rotate. In other cases, the front end of the driving rod 40 can be connected to a driver to electrically drive the driving rod 40 to rotate.

[0055] In summary, the jacking device provided by the embodiments of the present application is simple in structure, small in size, and light in weight, and can be placed in a small space and perform jacking operation. In the process of replacing the cylinder of the refueling machine of the nuclear power plant, the jacking device can be placed in the emergency disengagement gear of the main lifting device of the refueling machine and the bottom flange surface located on the bottom side of the emergency disengagement gear, and the jacking table 20 faces the emergency disengagement gear. Based on this, the driving rod 40 can be manually or electrically driven to rotate, so as to drive the nut 32 to rotate through the transmission connection between the driving rod 40 and the nut 32. Based on the rotation of the nut 32 and the threaded connection relationship between the nut 32 and the screw rod 31, the screw rod 31 is driven to move up and down relative to the nut 32, so as to drive the jacking table 20 to move up and down relative to the shell 10 through the screw rod 31. Thus, the jacking device can conveniently and reliably jack the emergency disengagement gear through the jacking table 20, so as to adjust the height of the emergency disengagement gear. Since the emergency disengagement gear is connected to the bottom end of the cylinder driving rod 40, adjusting the height of the emergency disengagement gear corresponds to adjusting the height of the connection between the cylinder driving rod 40 and the finger sleeve. Thus, the jacking device can conveniently, quickly, flexibly, controllably, and reliably adjust the height of the connection between the cylinder driving rod 40 and the finger sleeve to an appropriate height, so as to facilitate disassembly or reassembly of the driving rod 40 and the finger sleeve, thereby facilitating cylinder replacement.

[0056] During the adjustment, the jacking device can be in flat and large-area contact with the emergency disengagement gear through the jacking table 20, so as to reduce the risk of mechanical injury (such as hand clamping) and equipment damage to the operator.

[0057] And, the jacking device can achieve accurate control of the up-down moving stroke of the screw rod 31 via the number of rotations of the driving rod 40 based on the relationship among the rotation of the driving rod 40, the rotation of the nut 32, and the up-down movement of the screw rod 31. Thus, the jacking device has high adjustment accuracy, can quickly and accurately adjust the height, can reduce the number of times of repeated adjustment and adjustment of the operator on site, can reduce the working time of the operator on site, can reduce the radiation dose of the operator in the radiation environment, can protect the operator himself, and can improve the safety of operation.

[0058] And, during adjustment, even if the air cylinder accidentally loses air, causing the driving rod 40 and the emergency disengagement gear connected to the driving rod 40 and other components to suddenly drop, the jacking device can be supported between the emergency disengagement gear and the bottom flange surface via the housing 10 and the jacking platform 20, forming a safety protection height space between the emergency disengagement gear and the bottom flange surface, thereby reducing the risk of mechanical injury to the operator in the event of accidental loss of air in the air cylinder.

[0059] And, the jacking device is small and light in whole, easy to carry and store, reducing the risk of safety hazards caused by missing parts on site, i.e., reducing the risk of foreign matter.

[0060] And, the components (especially the transmission components therebetween) such as the driving rod 40, the nut 32, and the screw rod 31 are integrated in the housing 10. On the one hand, the housing 10 can protect these components, reducing the risk of damage to these components (especially the precise transmission relationship therebetween) caused by external impurities (such as dust, moisture, corrosive substances, etc.), thereby improving the use reliability and service life of the jacking device. On the other hand, the housing 10 can also hide these components, reducing the risk of accidental contact of the operator's fingers or other tools with these components, thereby reducing the risk of mechanical injury to the operator and the risk of damage to other tools.

[0061] Please refer to Figure 1 , Figure 3 , Figure 5 In some embodiments of the present application, the first mounting hole 11 is located on one side of the second mounting hole 12 in the left-right direction, the housing 10 is provided with a third mounting hole 13, the third mounting hole 13 extends along the left-right direction and communicates the first mounting hole 11 and the second mounting hole 12. The nut 32 is a worm nut. The jacking assembly 30 further comprises a worm 33 rotatably mounted in the third mounting hole 13 and engaged with the worm nut. The rear end of the driving rod 40 is provided with a driving bevel gear 41, and the end of the worm 33 close to the driving rod 40 is provided with a driven bevel gear 34 engaged with the driving bevel gear 41.

[0062] It should be noted that the first mounting hole 11 and the second mounting hole 12 are arranged in the front-rear direction, the first mounting hole 11 is located on one side of the second mounting hole 12 in the left-right direction, in this case, the shell 10 is provided with a third mounting hole 13, the third mounting hole 13 is arranged in the left-right direction, the second mounting hole 12 and the first mounting hole 11 are communicated through the third mounting hole 13, that is, the second mounting hole 12, the third mounting hole 13 and the first mounting hole 11 are communicated in sequence. In some embodiments, the third mounting hole 13 can be a circular hole.

[0063] The worm 33 is arranged in the left-right direction, the worm 33 is installed in the third mounting hole 13, and the worm 33 can rotate around the axis in the third mounting hole 13. The outer periphery of the worm 33 is provided with meshing teeth.

[0064] The nut 32 is a worm nut, that is, the nut 32 is both a nut 32 and a worm. That is, the outer periphery of the nut 32 is provided with meshing teeth. At the communication position of the third mounting hole 13 and the first mounting hole 11, the meshing teeth on the outer periphery of the nut 32 and the meshing teeth on the outer periphery of the worm 33 are engaged, that is, the worm 33 and the worm nut are engaged, based on which, the rotation of the worm 33 can drive the nut 32 to rotate.

[0065] The rear end of the drive rod 40 is provided with a driving bevel gear 41, one end of the worm 33 close to the drive rod 40 is provided with a driven bevel gear 34, the driven bevel gear 34 is engaged with the driving bevel gear 41, so that the drive rod 40 and the worm 33 are transmissionally connected, so that the rotation of the drive rod 40 can drive the nut 32 to rotate.

[0066] By adopting the above scheme, the drive rod 40 can be manually or electrically driven to drive the driving bevel gear 41 to rotate; based on the engagement of the driving bevel gear 41 and the driven bevel gear 34, the driven bevel gear 34 and the worm 33 are driven to rotate; based on the engagement of the worm 33 and the worm nut, the worm nut is driven to rotate; based on the threaded connection between the nut 32 and the screw rod 31, the screw rod 31 is driven to move up and down relative to the nut 32, so as to drive the jacking platform 20 to move up and down relative to the shell 10. Thus, the drive rod 40 and the worm nut of the jacking device can be reliably transmissionally connected through the driving bevel gear 41, the driven bevel gear 34 and the worm 33, the jacking device can conveniently, quickly, flexibly, controllably and reliably realize the jacking function, so as to optimize the structure of the jacking device and improve the structural reliability, use reliability and operation convenience of the jacking device.

[0067] And, the transmission between the worm 33 and the worm nut has self-locking property, in the case that the worm 33 stops rotating, the worm nut is locked by the worm 33 and is limited from rotating by itself, so that the stability of the jacking device in the static state can be enhanced, the jacking platform 20 of the jacking device can be stably supported in the static state to support the force receiving component (such as the emergency disengaging gear), and the "cylinder replacement" operation and the like can be conveniently performed in the case that the height of the jacking platform 20 is stably maintained. Especially, in the cylinder replacement process of the refueling machine of the nuclear power plant, even if the cylinder is accidentally out of gas and causes the driving rod 40 and the emergency disengaging gear and the like connected to the driving rod 40 to suddenly drop, the jacking device can be stably and reliably supported between the emergency disengaging gear and the bottom flange surface via the shell 10 and the jacking platform 20 to form a safety protection height space between the emergency disengaging gear and the bottom flange surface, and based on the self-locking between the worm 33 and the worm nut, the worm nut is not easy to reversely drive the worm 33 to rotate to cause the safety protection height space to be quickly compressed, that is, the jacking device will not suddenly lose the supporting force, so that the risk of mechanical injury to the operator in the case that the cylinder is accidentally out of gas can be reduced, and the risk of damage to the equipment in the case that the cylinder is accidentally out of gas can be reduced.

[0068] And, the jacking device can accurately control the moving stroke of the screw rod 31 by accurately controlling the number of rotation of the driving rod 40 based on the transmission ratio between the driving bevel gear 41 and the driven bevel gear 34, the transmission ratio between the worm 33 and the worm nut, and the transmission ratio between the nut 32 and the screw rod 31, so that the adjustment accuracy and reliability of the jacking device can be improved, the height adjustment can be quickly and accurately realized, the number of times of repeated adjustment and adjustment of the operator on site can be reduced, the working time of the operator on site can be reduced, the radiation dose of the operator in the irradiation environment and radioactive environment can be reduced, the operator can be protected, and the operation safety can be improved.

[0069] Of course, in other embodiments, the driving rod 40 and the nut 32 of the jacking device can be connected in transmission through other structural designs. For example, in the case that the first mounting hole 11 and the second mounting hole 12 are arranged in alignment in the front-rear direction, so that the second mounting hole 12 directly communicates with the first mounting hole 11, the driving rod 40 and the nut 32 can be connected in transmission through bevel gear engagement.

[0070] Please refer to Figure 1 , Figure 3 , Figure 5 In some embodiments of the present application, one end of the third mounting hole 13 away from the second mounting hole 12 communicates to the outside of the shell 10, and the jacking device comprises a first gland 50 connected to the outside of the shell 10 and covering the hole of the third mounting hole 13.

[0071] It should be noted that the third mounting hole 13 is communicated to the outside of the shell 10 at the end away from the second mounting hole 12, i.e. the end away from the driving rod 40. Based on this, the worm 33 and the components mounted on the worm 33 (for example, the driven bevel gear 34) can be assembled into the third mounting hole 13 from the opening of the third mounting hole 13 away from the second mounting hole 12.

[0072] When the worm 33 and the components mounted on the worm 33 are assembled into the third mounting hole 13, the first gland 50 can be arranged outside the opening of the third mounting hole 13 away from the second mounting hole 12 to close and cover the opening of the third mounting hole 13 away from the second mounting hole 12. The first gland 50 is connected to the shell 10 to stabilize the mounting position and state of the first gland 50 relative to the shell 10. The connection between the first gland 50 and the shell 10 can be, but is not limited to, bolt connection, welding, clamping, bonding, etc.

[0073] By using the above scheme, the worm 33 and the components mounted on the worm 33 can be assembled into the third mounting hole 13 from the opening of the third mounting hole 13 away from the second mounting hole 12, thereby improving the assembly convenience of the worm 33 and other components into the third mounting hole 13. On this basis, the first gland 50 can be further connected and fixed outside the shell 10 to close and cover the opening of the third mounting hole 13 away from the second mounting hole 12, so that the first gland 50 can cooperate with the shell 10 to protect the worm 33 and other components in the third mounting hole 13, thereby improving the protection performance of the shell 10 and the first gland 50 on the worm 33 and other components in the third mounting hole 13, and reducing the risk of external impurities entering the third mounting hole 13 and damaging the precise transmission components such as the worm 33. In this way, the structure of the jacking device can be optimized, and the assembly convenience, use reliability and service life of the jacking device can be improved.

[0074] Of course, in other embodiments, the shell 10 can have other structural designs to facilitate the assembly of the worm 33 and other components into the third mounting hole 13. For example, the shell 10 can be divided into two shell parts to facilitate the assembly of the driving rod 40, the nut 32, the screw 31 and other components into the shell 10 before the shell 10 is packaged.

[0075] Please refer to Figure 1 , Figure 3 , Figure 5In some embodiments of the present application, the worm 33 comprises a first mounting portion 331, a first sleeve portion 332, an engaging portion 333, and a second sleeve portion 334 arranged in sequence in a direction away from the second mounting hole 12. The driven bevel gear 34 is mounted on the first mounting portion 331, and the engaging portion 333 is engaged with the worm nut. The jacking assembly 30 comprises a first bearing 35 and a second bearing 36, the first bearing 35 is sleeved on the first sleeve portion 332 and is limited between the driven bevel gear 34 and the engaging portion 333, and the second bearing 36 is sleeved on the second sleeve portion 334 and is limited between the engaging portion 333 and the first gland 50.

[0076] It should be noted that the engaging portion 333 is a portion with engaging teeth on the outer periphery and used for engaging with the worm nut. The first mounting portion 331 is a portion for mounting the driven bevel gear 34, and the connection between the first mounting portion 331 and the driven bevel gear 34 can be, but is not limited to, bolt connection, etc.

[0077] The first sleeve portion 332 is connected between the first mounting portion 331 and the engaging portion 333, the first bearing 35 is sleeved between the outer periphery of the first sleeve portion 332 and the hole wall of the third mounting hole 13, and the first bearing 35 is axially limited between the driven bevel gear 34 and the engaging portion 333. Among them, the side of the first bearing 35 close to the engaging portion 333 can be limited via the shaft shoulder between the engaging portion 333 and the first sleeve portion 332; the side of the first bearing 35 close to the driven bevel gear 34 can be limited via the step formed on the hole wall of the third mounting hole 13, or can be limited via the driven bevel gear 34.

[0078] The second sleeve portion 334 is connected to the side of the engaging portion 333 away from the first sleeve portion 332, the second bearing 36 is sleeved between the outer periphery of the second sleeve portion 334 and the hole wall of the third mounting hole 13, and the second bearing 36 is axially limited between the engaging portion 333 and the first gland 50. Among them, the side of the second bearing 36 close to the engaging portion 333 can be limited via the shaft shoulder between the engaging portion 333 and the second sleeve portion 334; the side of the second bearing 36 close to the first gland 50 can be limited via the pressing of the first gland 50.

[0079] Among them, the type of the first bearing 35 and the type of the second bearing 36 can be the same or different.

[0080] By adopting the above scheme, the worm gear 33, through its segmented design (first mounting part 331, first sleeve part 332, meshing part 333, and second sleeve part 334), allows each part to bear specific functions and stresses, thereby enhancing the structural reliability, structural stability, and load-bearing capacity of the worm gear 33. Based on this, combined with the design of "first bearing 35 sleeved on first sleeve part 332 and confined between driven bevel gear 34 and meshing part 333", "second bearing 36 sleeved on second sleeve part 334 and confined between meshing part 333 and first pressure cover 50", and "driven bevel gear 34 connected and fixed to first mounting part 331", the worm gear 33 and its components can maintain stable relative mounting positions and states, thereby improving the overall structural stability of the worm gear 33 and its components, reducing vibration and offset during transmission, and improving transmission accuracy and stability.

[0081] Furthermore, based on the above structure, the rotational friction coefficient of the worm 33 in the third mounting hole 13 can be reduced via the first bearing 35 and the second bearing 36, thereby improving the smoothness and stability of the rotation of the worm 33 in the third mounting hole 13. This can improve the transmission reliability of the worm 33 between the drive rod 40 and the worm wheel nut, and improve the structural and operational reliability of the lifting device.

[0082] Please see Figure 1 , Figure 3 , Figure 5 In some embodiments of this application, two lifting components 30 are provided, which are respectively located on the left and right sides of the drive rod 40. The driven bevel gears 34 of the two lifting components 30 are meshed with the driving bevel gear 41, and the screws 31 of the two lifting components 30 are connected to the lifting platform 20.

[0083] It should be noted that a lifting assembly 30 is provided on each of the left and right sides of the drive rod 40. The driven bevel gears 34 of both lifting assemblies 30 mesh with the driving bevel gear 41, so that the rotation of the drive rod 40 can drive the worm gears 33 of the two lifting assemblies 30 to rotate, thereby driving the screws 31 of the two lifting assemblies 30 to move up and down synchronously. The screws 31 of both lifting assemblies 30 are connected to the lifting platform 20, so that the screws 31 of the two lifting assemblies 30 can jointly drive the lifting platform 20 to move up and down.

[0084] Correspondingly, the outer casing 10 is provided with two third mounting holes 13 and two first mounting holes 11, and the two sets of "third mounting holes 13 and first mounting holes 11" are respectively located on the left and right sides of the second mounting hole 12.

[0085] By adopting the above scheme, one lifting assembly 30 can be arranged on each of the left and right sides of the driving rod 40, and via the design of the "driving bevel gear 41 double-sidedly engaging the driven bevel gears 34 of the two lifting assemblies 30", the driving rod 40 can provide balanced driving force to the two lifting assemblies 30, so that the driving rod 40 can drive the two lifting assemblies 30 to work simultaneously. Based on this, the structure of the lifting device can be optimized, and the reliability and integration of the structure of the lifting device can be improved. Moreover, the two lifting assemblies 30 can be facilitated to realize double-sided support of the lifting platform 20, so that the stability of the lifting platform 20 during the up-and-down movement can be improved, the possibility of shaking and tilting of the lifting platform 20 can be reduced, and the reliability of the lifting operation can be improved. Moreover, the two lifting assemblies 30 can be facilitated to share the load, the force required to be borne by each lifting assembly 30 can be reduced, so that the speed and efficiency of lifting can be improved, and the use reliability and service life of the lifting assembly 30 can be improved.

[0086] Of course, in other embodiments, the lifting assembly 30 can be one, three, etc. as needed.

[0087] Please refer to Figure 1 , Figure 4 , Figure 5 In some embodiments of the present application, the nut 32 comprises a first end portion 321, a main body portion 322 and a second end portion 323 arranged in sequence from top to bottom. The lifting assembly 30 comprises a third bearing 37, the third bearing 37 is sleeved on the second end portion 323 and is limited between the main body portion 322 and the hole bottom of the first mounting hole 11. The lifting device comprises a second gland 60, the second gland 60 is sleeved between the first end portion 321 and the first mounting hole 11 and limits the up-and-down movement of the main body portion 322.

[0088] It should be noted that the threaded hole 324 of the nut 32 penetrates the first end portion 321, the main body portion 322 and the second end portion 323 from top to bottom. The main body portion 322 is the part of the nut 32 located in the middle in the up-and-down direction. In the case that the nut 32 is a worm nut, the outer peripheral surface of the main body portion 322 is provided with engagement teeth and is used for engaging with the worm 33.

[0089] The second end portion 323 is connected to the lower side of the main body portion 322, the third bearing 37 is sleeved between the outer periphery of the second end portion 323 and the hole wall of the first mounting hole 11, and the third bearing 37 is axially limited between the main body portion 322 and the hole bottom of the first mounting hole 11. Among them, the side of the third bearing 37 close to the main body portion 322 can be limited by the shaft shoulder between the main body portion 322 and the second end portion 323. The side of the third bearing 37 away from the main body portion 322 abuts to the hole bottom of the first mounting hole 11 to achieve limiting.

[0090] The first end portion 321 is connected to the upper side of the main body portion 322, the first end portion 321 is provided through the second gland 60, the second gland 60 is sleeved between the outer periphery of the first end portion 321 and the hole wall of the first mounting hole 11, the second gland 60 does not interfere with the threaded connection of the screw rod 31 and the nut 32 and the up-down movement of the screw rod 31. The second gland 60 is connected and fixed with the shell 10, and the connection and fixing mode can be but not limited to bolt connection, bonding, welding and the like. The second gland 60 presses against the main body portion 322, and the second gland 60 can axially limit the main body portion 322 between the second gland 60 and the third bearing 37 to limit the up-down movement of the main body portion 322.

[0091] By adopting the above scheme, the nut 32 and the third bearing 37 sleeved with the second end portion 323 of the nut 32 can be assembled into the first mounting hole 11 from the upper hole of the first mounting hole 11, and the third bearing 37 is directly axially limited between the main body portion 322 and the hole bottom of the first mounting hole 11. Based on this, the assembly convenience of assembling the assembly formed by the nut 32 and the third bearing 37 into the first mounting hole 11 can be improved. On this basis, the second gland 60 can be sleeved between the outer periphery of the first end portion 321 and the hole wall of the first mounting hole 11, so as to press the main body portion 322 through the second gland 60, and axially limit the main body portion 322 between the second gland 60 and the third bearing 37, thereby limiting the up-down movement of the main body portion 322, stabilizing the axial position of the nut 32, limiting the up-down movement of the nut 32, and not affecting the circumferential rotation freedom of the nut 32. Thus, the nut 32 can drive the screw rod 31 to move up and down through rotation, and the overall structural stability of the nut 32 and the components mounted on the nut 32 can be improved, the vibration and deviation of the assembly during transmission can be reduced, and the transmission accuracy and stability can be improved.

[0092] Moreover, the second gland 60 can cooperate with the third bearing 37 to stabilize the central axis position of the nut 32, and the third bearing 37 can reduce the rotation friction coefficient of the nut 32, thereby improving the rotation smoothness and stability of the nut 32 in the first mounting hole 11, improving the transmission reliability of the nut 32, and improving the structural reliability and use reliability of the jacking device.

[0093] Please refer to Figure 1 、 Figure 4 、 Figure 5 In some embodiments of the present application, the hole bottom of the first mounting hole 11 is provided with a through hole 14, the through hole 14 and the threaded hole 324 of the nut 32 are arranged in alignment in the up-down direction, and the through hole 14 can be used for partially passing the screw rod 31 therein.

[0094] It should be noted that the bottom of the first mounting hole 11 is provided with a through hole 14, which is located below the threaded hole 324 of the nut 32. During the downward movement of the screw rod 31 relative to the threaded hole 324, the lower end of the screw rod 31 is allowed to pass through the threaded hole 324 of the nut 32 and extend into the through hole 14. That is, in the up-down direction, the sum of the size of the threaded hole 324 of the nut 32 and the size of the through hole 14 restricts the up-down movement stroke of the screw rod 31.

[0095] By adopting the above scheme, by opening the through hole 14 at the bottom of the first mounting hole 11, a part of the screw rod 31 is allowed to pass through the threaded hole 324 of the nut 32 and continue to extend downward into the through hole 14 without increasing the overall height of the shell 10. Based on this, the up-down movement stroke of the screw rod 31 can be extended through the cooperation of the threaded hole 324 of the nut 32 and the through hole 14, thereby expanding the height adjustment range of the jacking device without expanding the size of the jacking device, thereby expanding the application range of the jacking device and improving the use performance of the jacking device.

[0096] Of course, in other embodiments, the bottom of the first mounting hole 11 can be omitted to be provided with the through hole 14, that is, the bottom of the first mounting hole 11 is closed, and in this case, the length of the threaded hole 324 of the nut 32 in the up-down direction is the up-down movement stroke of the screw rod 31.

[0097] Please refer to Figure 1 , Figure 3 , Figure 5 In some embodiments of the present application, the rear end of the drive rod 40 is provided with a driving bevel gear 41, a plurality of fourth bearings 70 and a plurality of positioning sleeves 80 are sleeved between the drive rod 40 and the second mounting hole 12, the driving bevel gear 41 and the fourth bearing 70 adjacent thereto are spaced and limited by the positioning sleeve 80, and the adjacent two fourth bearings 70 are spaced and limited by the positioning sleeve 80. The jacking device comprises a third gland 90, which is sleeved between the drive rod 40 and the second mounting hole 12 and abuts against the fourth bearing 70 adjacent thereto.

[0098] It should be noted that a plurality of fourth bearings 70 are sleeved between the outer periphery of the drive rod 40 and the hole wall of the second mounting hole 12, and the plurality of fourth bearings 70 are spaced along the axial direction of the drive rod 40. A plurality of positioning sleeves 80 are also sleeved between the outer periphery of the drive rod 40 and the hole wall of the second mounting hole 12.

[0099] One of the positioning sleeves 80 abuts against the driving bevel gear 41 at the rear end of the drive rod 40 and the fourth bearing 70 closest to the driving bevel gear 41, so that the driving bevel gear 41 and the fourth bearing 70 closest to the driving bevel gear 41 are spaced and the relative axial positions are stable.

[0100] At least one positioning cylinder 80 is limited to abut between two adjacent fourth bearings 70, so that the two adjacent fourth bearings 70 are arranged at intervals and stabilize the relative axial positions of each other.

[0101] In some embodiments, the driving bevel gear 41 and the fourth bearing 70 closest to the driving bevel gear 41 are spaced by the conical positioning cylinder 80, and the two adjacent fourth bearings 70 are spaced by the cylindrical positioning cylinder 80.

[0102] It should be further noted that the driving rod 40 passes through the third gland 90, and the third gland 90 is arranged between the outer periphery of the driving rod 40 and the hole wall of the second mounting hole 12, and the arrangement of the third gland 90 does not interfere with the rotation of the driving rod 40. The third gland 90 is connected and fixed with the shell 10, and the connection and fixing mode can be but not limited to bolt connection, bonding, welding, etc. The third gland 90 is limited to abut the fourth bearing 70 closest to it, so that the driving bevel gear 41, each positioning cylinder 80, each fourth bearing 70, and the third gland 90 are closely abutted and stabilize the relative axial positions of each other.

[0103] By adopting the above scheme, the driving rod 40 and the driving bevel gear 41, each positioning cylinder 80, and each fourth bearing 70 mounted on the driving rod 40 can be assembled into the second mounting hole 12 as a component through the front hole of the second mounting hole 12, thereby improving the assembly convenience of the component. On this basis, the third gland 90 can be further arranged between the outer periphery of the driving rod 40 and the hole wall of the second mounting hole 12 to press the fourth bearing 70 closest to it through the third gland 90, so as to make the driving bevel gear 41, each positioning cylinder 80, each fourth bearing 70, and the third gland 90 closely abut and stabilize the relative axial positions of each other. Therefore, without affecting the rotational freedom of the driving rod 40, the structural stability of the component can be improved, the vibration and deviation of the component in the transmission process can be reduced, and the transmission accuracy and stability can be improved.

[0104] In addition, each fourth bearing 70 can collectively reduce the rotational friction coefficient of the driving rod 40, thereby improving the rotational smoothness and stability of the driving rod 40 in the second mounting hole 12, improving the transmission reliability of the driving rod 40, and improving the structural reliability and use reliability of the jacking device.

[0105] Please refer to Figure 1 , Figure 3 , Figure 5 In some embodiments of the present application, the jacking device comprises a sleeve 100 mounted on the second mounting hole 12, and a part of the driving rod 40 passes through the sleeve 100. It should be noted that the mounting mode between the sleeve 100 and the second mounting hole 12 can be but not limited to the plug-in connection, clamping, etc.

[0106] By adopting the above scheme, the drive rod 40 can be partially inserted into the sleeve 100 installed in the second mounting hole 12 to extend the protection of the partial drive rod 40, thereby improving the use reliability and service life of the drive rod 40.

[0107] Please refer to Figure 1 , Figure 3 , Figure 5 In some embodiments of the present application, the front end of the drive rod 40 is provided with a wrench part 42. It should be noted that the front end of the drive rod 40 protrudes from the second mounting hole 12 and the sleeve 100, and the front end of the drive rod 40 is provided with a wrench part 42, which can be but not limited to flat.

[0108] By adopting the above scheme, the operator can manually drive the drive rod 40 to rotate by holding the wrench part 42 at the front end of the drive rod 40. Based on this, the operation flexibility of the drive rod 40 rotation can be improved, the structure and operation of the jacking device can be simplified, the dependence on power source and power supply can be reduced, the application occasions of the jacking device can be expanded, the use reliability and safety of the jacking device can be improved, and the cost of the jacking device can be reduced.

[0109] Please refer to Figure 1 , Figure 2 , Figure 5 In some embodiments of the present application, the jacking table 20 includes a support part 21 connected with the screw rod 31, and an extension part 22 connected to a circumferential side of the support part 21, and the upper side of the extension part 22 is lower than the upper side of the support part 21. Among them, the lower side of the extension part 22 can be flush with the lower side of the support part 21, or not flush with the lower side of the support part 21.

[0110] By adopting the above scheme, the jacking table 20 can be in flat and large-area contact with the force receiving part (such as the emergency disengaging gear) through the support part 21 directly connected with the screw rod 31, thereby facilitating stable and reliable jacking of the force receiving part, and reducing the risk of mechanical injury (such as hand clamping) to the operator and the risk of equipment damage. The jacking table 20 can also enhance the overall structural strength and rigidity of the jacking table 20 through the extension part 22 connected to the circumferential side of the support part 21, and by making the upper side of the extension part 22 lower than the upper side of the support part 21, the extension part 22 can be prevented from directly contacting the force receiving part, thereby reducing the uneven force caused by the contact and interference between the extension part 22 and the force receiving part, thereby improving the use reliability and service life of the jacking table 20.

[0111] The above only describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A jacking device, characterized in that The jacking device comprises: a housing, an upper side of the housing is provided with a first mounting hole extending in the up-down direction, a front side of the housing is provided with a second mounting hole extending in the front-rear direction, the second mounting hole is communicated with the first mounting hole; a jacking table provided on the upper side of the housing; a jacking assembly comprising a screw rod and a nut, the nut is rotatably mounted in the first mounting hole and is limited to move up and down, the screw rod extends in the up-down direction and is threadedly connected in the nut, an upper end of the screw rod is connected with the jacking table; a drive rod rotatably mounted in the second mounting hole, a rear end of the drive rod is in transmission connection with the nut, and rotation of the drive rod can drive the nut to rotate.

2. The jacking device of claim 1, wherein The first mounting hole is located on one side of the second mounting hole in the left-right direction, the housing is provided with a third mounting hole, the third mounting hole extends in the left-right direction and is communicated with the first mounting hole and the second mounting hole; The nut is a worm nut, the jacking assembly further comprises a worm, the worm is rotatably mounted in the third mounting hole and is in engagement with the worm nut, a rear end of the drive rod is provided with a driving bevel gear, one end of the worm close to the drive rod is provided with a driven bevel gear, and the driven bevel gear is in engagement with the driving bevel gear.

3. The jacking device of claim 2, wherein An end of the third mounting hole away from the second mounting hole is communicated to the outside of the housing, and the jacking device comprises a first gland, the first gland is connected to the outside of the housing and covers the aperture of the third mounting hole.

4. The jacking device of claim 3, wherein The worm comprises a first mounting portion, a first sleeve portion, an engagement portion and a second sleeve portion arranged in sequence in the direction away from the second mounting hole, the driven bevel gear is mounted on the first mounting portion, and the engagement portion is in engagement with the worm nut; The jacking assembly comprises a first bearing and a second bearing, the first bearing is sleeved on the first sleeve portion and is limited between the driven bevel gear and the engagement portion, and the second bearing is sleeved on the second sleeve portion and is limited between the engagement portion and the first gland.

5. The jacking device of claim 2, wherein The jacking assembly is provided with two, the two jacking assemblies are separately arranged on the left and right sides of the drive rod, the driven bevel gears of the two jacking assemblies are in engagement with the driving bevel gear, and the screw rods of the two jacking assemblies are connected with the jacking table.

6. Jacking device according to any of claims 1-5, characterized in that The nut comprises a first end portion, a main body portion and a second end portion arranged in sequence from top to bottom, the jacking assembly comprises a third bearing, the third bearing is sleeved on the second end portion and is limited between the main body portion and the bottom of the first mounting hole, and the jacking device comprises a second gland, the second gland is sleeved between the first end portion and the first mounting hole and limits the up-down movement of the main body portion.

7. Jacking device according to any of claims 1-5, characterized in that The bottom of the first mounting hole is provided with a through hole, the through hole and the threaded hole of the nut are arranged in alignment in the up-down direction, and the through hole can allow the partial screw rod to pass therethrough.

8. The jacking device of any one of claims 1-5, wherein, The rear end of the driving rod is provided with a driving bevel gear, a plurality of fourth bearings and a plurality of positioning sleeves are sleeved between the driving rod and the second mounting hole, the driving bevel gear and the fourth bearings adjacent to the driving bevel gear are spaced by the positioning sleeves, and two adjacent fourth bearings are spaced by the positioning sleeves. The jacking device comprises a third gland, the third gland is sleeved between the driving rod and the second mounting hole, and the third gland abuts and limits the fourth bearings adjacent to the third gland.

9. The jacking device of any one of claims 1-5, wherein, The jacking device comprises a sleeve, the sleeve is installed on the second mounting hole, and the driving rod is partially arranged in the sleeve.

10. The jacking device of any one of claims 1-5, wherein, The front end of the driving rod is provided with a wrench part. And / or, the jacking table comprises a support part connected with the screw rod, and an extension part connected to a circumferential side of the support part, the upper side of the extension part is lower than the upper side of the support part.

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