Weight lifting structure

Abstract

The present invention addresses the problem of developing, in a device that lifts and lowers a heavy object through a nut by means of a threaded shaft, a method that makes it possible to supplement the nut even if the nut falls due to wear or the like of the nut. An auxiliary nut is assembled together with a main nut which is lifted by rotating a rotating shaft while supporting a heavy object, and the auxiliary nut is screwed with the rotating shaft on the lower side separated from the main nut by a specified interval and is driven by the rotation of the main nut in a manner of not supporting the heavy object. Even if the main nut falls due to abrasion, damage and the like, the auxiliary nut can prevent falling of a heavy object, and the main nut can be supplemented.

Description

Technical Field

[0001] This invention relates to a device for lifting and lowering heavy objects. Background Technology

[0002] A screw jack, which uses a nut screwed onto a threaded shaft to raise or lower heavy objects by rotating the shaft, is used in various fields. On the other hand, the nut sometimes needs to be raised or lowered while supporting a heavy object, or it needs to remain in a supporting state. This process can easily cause wear and breakage of the nut.

[0003] Here, we imagine a scenario where the nut's thread grooves become worn and unable to function, or where it breaks, and the nut falls downwards along with the weight.

[0004] It is preferable if additional nuts can be provided in advance to support the heavy object even in such an emergency. Examples of auxiliary nuts include, for instance, the following prior art.

[0005] Prior art literature

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Publication No. 61-1189

[0008] On the other hand, Patent Document 1 is a technology for efficiently supplying grease for lubrication of threaded parts, rather than a technology for dealing with emergencies such as the nut falling due to wear. Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] Therefore, the inventors of this application have developed a method to replenish a weight in a device that uses a threaded shaft to lift and lower a weight via a nut, even if the nut falls due to wear or other reasons.

[0011] Solution for solving the problem

[0012] Through in-depth research, the inventors discovered that by assembling an auxiliary nut together with a main nut that supports a load while rotating a shaft to raise and lower the load, and by screwing the auxiliary nut onto the shaft at a predetermined distance below the main nut, the auxiliary nut is driven by the rotation of the main nut without supporting the load. Thus, even if the main nut falls due to wear, damage, or other reasons, the auxiliary nut can prevent the load from falling and can supplement the main nut.

[0013] That is, the first invention of this application is:

[0014] A heavy object lifting device, comprising:

[0015] A rotating shaft having a threaded structure and being arranged in a generally vertical direction;

[0016] The main nut, which is screwed onto the rotating shaft, supports the weight while raising and lowering it by rotating the rotating shaft; and

[0017] An auxiliary nut, screwed onto the rotating shaft at a predetermined interval below the main nut, is driven by the rotation of the main nut in a manner that does not support the weight.

[0018] Next, preferably, the auxiliary nut can be divided into multiple sections along the longitudinal direction. This division allows for subsequent assembly of the auxiliary nut.

[0019] That is, the second invention of this application is:

[0020] "According to the heavy object lifting device of the first invention, wherein..."

[0021] The auxiliary nut has a structure capable of being divided into multiple sections along the longitudinal direction.

[0022] Next, preferably, the auxiliary nut can be divided into multiple sections along the longitudinal direction. This division allows for subsequent assembly of the auxiliary nut.

[0023] That is, the third invention of this application is:

[0024] "According to the heavy lifting device of the second invention, wherein..."

[0025] The aforementioned multi-segmentation is a two-segmentation.

[0026] Next, in order to make the auxiliary nut follow the main nut, it is preferable to use a method that applies rotational force to the auxiliary nut by means of a pin provided at the lower part of the main nut, thereby making it follow the main nut.

[0027] That is, the fourth invention of this application is:

[0028] "According to the first or second invention, the heavy object lifting device, wherein..."

[0029] A pin is provided at the lower part of the main nut to make the auxiliary nut follow the main nut.

[0030] Next, the applicant also intends to protect the auxiliary nuts themselves used in the first to fourth inventions of this application.

[0031] That is, the fifth invention of this application is:

[0032] "An auxiliary nut, which is the auxiliary nut used in the heavy lifting device of any one of the first to fourth inventions."

[0033] Next, the heavy lifting device of the present invention is particularly suitable for the structure described in the specific examples of cases in which a heavy lifting device is used in this application specification.

[0034] That is, the sixth invention of this application is:

[0035] "According to the first or second invention, the heavy object lifting device, wherein..."

[0036] The heavy object lifting device is used as a mechanism in a conveying device to lift or lower a specific area.

[0037] The conveying device includes:

[0038] A pair of drive sprockets and driven sprockets are rotatably configured relative to the support body at a predetermined interval;

[0039] A mechanism capable of moving the driven sprocket relative to the support body;

[0040] A pair of annular conveyor chains are wound around the drive sprocket and the driven sprocket, and the upper side forms a transport surface for the articles;

[0041] A mold frame, which is equally spaced and assembled between the pair of conveyor chains; and

[0042] A mechanism for raising and lowering a specific area on the transport surface side of the pair of conveyor chains.

[0043] Invention Effects

[0044] By utilizing the heavy lifting device of the present invention, even in emergency situations such as wear / damage to the main nut, the auxiliary nut can supplement the main nut, thereby preventing the heavy object from falling. Attached Figure Description

[0045] Figure 1 This is a schematic front view of the first embodiment of the heavy lifting device of the present invention and a schematic front view showing the changes when the object is raised.

[0046] Figure 2 This is a perspective view showing the vicinity of the auxiliary nut in the first embodiment of the present invention.

[0047] Figure 3 This is a schematic diagram of the overall front view of the first embodiment of the present invention and a schematic diagram of the overall front view showing the changes when the main nut shows wear, etc.

[0048] Figure 4 The first embodiment of the present invention shows an overall front view schematic diagram illustrating the function of the confirmation pin and an overall front view schematic diagram showing the changes.

[0049] Figure 5 This is a perspective view showing the divided state of the auxiliary nut according to the first embodiment of the present invention.

[0050] Figure 6 This is a perspective view showing the direction of the division of the auxiliary nut of the present invention.

[0051] Figure 7 This is a perspective view showing the assembly method of assembling the auxiliary nut of the present invention onto a threaded shaft.

[0052] Figure 8 This is a perspective view showing a pin-fixing member (pin-fixing plate) according to the first embodiment of the present invention.

[0053] Figure 9 This is a perspective view showing another configuration of the auxiliary nut of the present invention (where there are two pins).

[0054] Figure 10 This is a side view schematic diagram of a frying processing apparatus as a specific example of the weight lifting device of the present invention.

[0055] Figure 11 The side view of the frying apparatus, which is a specific example of the weight lifting device of the present invention, shows the state including the side panel.

[0056] Figure 12 This is an enlarged side view of the vicinity of the driven sprocket of the conveying device in a frying processing apparatus equipped with the weight lifting device of the present invention.

[0057] Figure 13 This is a perspective view of a frame connected to the conveyor chain of the conveyor in the frying processing apparatus equipped with the heavy lifting device of the present invention.

[0058] Figure 14 This is a side view before the lifting process of a specific area of ​​the conveyor chain of the conveyor in the frying processing apparatus equipped with the weight lifting device of the present invention, including the frame including the track limit bar and the cover conveyor, etc.

[0059] Figure 15 It shows the frame from Figure 14 A side view diagram of the ascent.

[0060] Figure 16 It shows the frame from Figure 15 A side view diagram showing the completed ascent.

[0061] Explanation of reference numerals in the attached figures

[0062] 1. A rotating shaft with a threaded structure (threaded shaft)

[0063] 3 sprockets

[0064] 5 main nuts

[0065] 7 auxiliary nuts

[0066] 9 sales

[0067] 11. Pin-fixing components (plates for pin fixing)

[0068] 13 recess

[0069] 15 Support rods

[0070] 17 Connecting rod

[0071] 19 Confirmed Sales

[0072] 21 Connecting screws

[0073] 23 Connecting bolts

[0074] 31 Side Panel

[0075] 33 Heavy lifting device

[0076] 35 Support body

[0077] 37 Drive sprocket

[0078] 39 Driven sprocket

[0079] 41 Counterweight

[0080] 43 Wires

[0081] 45. Teleportation Chain

[0082] 47 Module

[0083] 49 Supply Machine

[0084] 51 Deep Frying Tank

[0085] 53. Cover

[0086] 55 Track Limiting Bars

[0087] 57 Other conveyor belts

[0088] 59. Cover conveyor device

[0089] 61. Frame (including cover conveyor, etc.). Detailed Implementation

[0090] The present invention will be described below with reference to embodiments. However, the present invention is not limited to the following embodiments.

[0091] The first invention of this application is:

[0092] A heavy object lifting device, comprising:

[0093] A rotating shaft having a threaded structure and being arranged in a generally vertical direction;

[0094] The main nut, which is screwed onto the rotating shaft, supports the weight while raising and lowering it by rotating the rotating shaft; and

[0095] An auxiliary nut, screwed onto the rotating shaft at a predetermined interval below the main nut, is driven by the rotation of the main nut in a manner that does not support the weight.

[0096] The following is an explanation of this content. Figure 1 This is a front view showing the overall structure of the heavy lifting device of the present invention. Additionally, Figure 2 This is a three-dimensional schematic diagram showing the area near the auxiliary nut.

[0097] —Rotating shaft with threaded structure—

[0098] The heavy object lifting device 33 of the present invention includes a rotating shaft (threaded shaft) 1 with a threaded structure. For example... Figure 1 In the first embodiment, the rotating shaft 1 is mounted vertically and becomes a threaded shaft. The threaded shaft 1 has a threaded portion extending from top to bottom and a cylindrical portion continuous with the threaded portion but without thread grooves.

[0099] The sprocket 3 is mounted to the cylindrical portion in a horizontal orientation. A chain is also mounted on the sprocket 3, allowing it to rotate in conjunction with a power unit (not shown). Furthermore, bearings, gears, support platforms, etc., are appropriately configured to hold the threaded shaft 1 vertically and enable its rotation.

[0100] Next, firstly, a main nut 5 that engages with the threaded shaft 1 is assembled onto the threaded shaft 1. Additionally, a pin-fixing member 11 with a pin 9 is assembled at the lower part of the threaded shaft 1; this pin 9 facilitates the drive of the auxiliary nut 7, which will be described later.

[0101] Furthermore, an auxiliary nut 7 is provided at a predetermined interval to engage with the threaded shaft 1, and the front end of the pin 9 is fitted into the recess provided in the auxiliary nut 7 in a snap-fit ​​manner.

[0102] It should be noted that, for convenience, in Figure 1 In the diagram, the main nut and pin fixing member are shown in sectional view, while the pin 9 and auxiliary nut 7 are shown in front view.

[0103] Next, the cylindrical support rod 15 is fitted into the main nut 5 from the top and inserted into the side of the main nut 5, and is fixed to the main nut 5 as a whole by means of screws.

[0104] A connecting rod 17 for connecting to a specified load is provided on the upper part of the cylindrical support rod 15.

[0105] It should be noted that the load refers to a state where a load is applied to the main nut 5 via the support rod 15. On the other hand, it refers to a state where no load-based load is applied to the auxiliary nut 7.

[0106] —Lifting and lowering heavy objects—

[0107] In order to Figure 1 As shown, the weight is lifted upwards (pushed up), and in the first embodiment of the invention, the sprocket 3 mounted on the threaded shaft 1 is rotated. On the other hand, the load of the weight is applied to the main nut 5, which is screwed onto the threaded shaft 1, via the support rod, so the main nut 5 cannot rotate.

[0108] Therefore, when the threaded shaft 1 rotates, the main nut that engages with the threaded shaft... Figure 1 It rises as shown. In this way, the load (weight) can be raised by raising the main nut 5.

[0109] It should be noted that the rotation of the threaded shaft can be performed by connecting it to a specified motor, or it can be performed manually.

[0110] It should be noted that, in the first embodiment of the present invention, rotational force is applied to the sprocket 3 by winding the chain around the sprocket 3 and connecting it to a predetermined power unit.

[0111] Next, the auxiliary nut 7 is screwed into the threaded shaft 1 at a predetermined interval from the main nut 5 and the pin fixing member 11. In addition, the auxiliary nut 7, which is engaged with the main nut 5 via the pin 9, is driven by the main nut 5, and therefore, the auxiliary nut 7 also rises together with the main nut 5.

[0112] In addition, under normal conditions, the auxiliary nut 7 is only driven by the main nut 5 and is in a state where no load based on the load from above is applied.

[0113] Conversely, when the load (heavy object) is lowered, the main nut 5 can be lowered by rotating the threaded shaft in the opposite direction to the above, and the heavy object also lowers.

[0114] —Wear / damage condition of the main nut—

[0115] In the heavy lifting device 33 of the present invention, in the event that the main nut 5 is damaged or falls downwards, an auxiliary nut 7 is also used as an emergency measure to supplement the main nut 5.

[0116] In the structure of the present invention, a load based on the load is applied to the main nut 5, so wear and damage to the main nut side are easily generated by the process of raising and lowering the main nut.

[0117] Here, as Figure 3 As shown, in the event that the threaded groove on the main nut side becomes worn and unable to function, or is damaged, the main nut 5 is expected to fall downwards.

[0118] On the other hand, if the auxiliary nut 7 is in its normal state, it is only driven by the rotation of the main nut 5 and is not subjected to load-based loads from above. Therefore, compared with the main nut 5, the auxiliary nut 7 is significantly less prone to wear and breakage.

[0119] Therefore, in the event that the main nut 5 falls due to wear or damage to the thread groove of the main nut 5, it will fall by the amount of space between itself and the auxiliary nut 7. In such an emergency, the auxiliary nut 7 can bear the action, thus limiting the fall of the load and preventing the heavy object from falling, thereby preventing a major accident.

[0120] It should be noted that when the main nut falls, the support rod 15 also falls. Therefore, in order to detect such abnormal situations, a pre-set mechanism is required. Figure 4 As shown, the mechanism of the confirmation pin 19, which normally passes horizontally through the side of the support rod 15 and directly above the upper end of the threaded shaft 1, allows the main nut 5 and the support rod 15 to fall in an abnormal situation, making it impossible for the confirmation pin 19 to enter, thus enabling the detection of this abnormal situation.

[0121] The mechanism for confirming pin 19 is an effective method of confirmation, especially when the main nut 5 and auxiliary nut 7 cannot be visually identified from the outside due to covers, etc.

[0122] —The auxiliary nut has a structure capable of being segmented longitudinally—

[0123] Preferably, the auxiliary nut 7 has a structure capable of being divided into multiple sections along the longitudinal direction. That is, for example, in the first embodiment of the invention shown in the figures, the auxiliary nut 7 is as follows: Figure 8 As shown, it can be divided into two parts along the longitudinal direction, and can be achieved through, as... Figure 5 As shown, two connecting screws 21 inserted laterally are assembled at the front and back to form a single unit.

[0124] It should be noted that the division method is not limited to two divisions; it can also be three, four, or more divisions. Furthermore, in this application, "capable of longitudinal division" refers to the ability to divide the auxiliary nut 7 along the direction of the helical travel of the thread groove (longitudinal direction), such as... Figure 6As shown, the direction of the division is not only parallel to the direction of travel of the helix of the thread groove, but can also be inclined or bent.

[0125] Furthermore, there is no limitation on the method of re-integrating the divided auxiliary nuts 7; various methods such as bolts and nuts, fusion welding, etc., can be used.

[0126] In this way, by pre-forming the auxiliary nut 7 in a separable manner, it has the advantage that the auxiliary nut 7 can be assembled later for heavy lifting devices that are already only equipped with the threaded shaft 1 and the main nut 5.

[0127] In other words, if the auxiliary nut 7 is to be installed after the auxiliary nut 7 is installed from the state of a heavy lifting device used for lifting heavy objects without the auxiliary nut 7, that is, only the threaded shaft 1 for supporting heavy objects and the main nut 5 are installed, if the auxiliary nut 7 cannot be separated, it is necessary to go through the process of removing the main nut 5 from the threaded shaft 1 and then reinstalling the main nut 5 after installing the auxiliary nut 7.

[0128] The operation of completely separating the threaded shaft 1 from the main nut 5, which involves moving heavy objects, can easily become a complicated task and often a difficult situation.

[0129] On the other hand, if the auxiliary nut 7 can be divided into multiple segments, it can pass through the subsequent installation process even when the load is already supported by the main nut 5. Figure 7 As shown, the auxiliary nut 7 is assembled, making the operation easier and providing the advantage of quick response.

[0130] Furthermore, in the first embodiment of the present invention, it is necessary to set up a structure in which the pin 9 is inserted by rear insertion. In such a case, if the auxiliary nut 7 is not made to be divisible, there may be constraints on the assembly steps and structure.

[0131] That is, if it is a divisible structure, it has the effect of being able to assemble the auxiliary nut 7 in a position that matches (matches phase) with the fixed pin 9.

[0132] —A mechanism for causing the auxiliary nut to be driven by the rotation of the main nut—

[0133] In this invention, a mechanism is required to drive the auxiliary nut 7 to the main nut 5 described above. Various methods can be selected for this driven mechanism. For example, a method based on a pin-fixing member (pin-fixing plate) 11 mounted below the main nut is disclosed in the first embodiment of this application.

[0134] exist Figure 1 , Figure 2 The first embodiment of the present invention shown adopts the following form: Figure 8As shown, a two-part pin-fixing plate 11 without threaded groove 1 is used, through which a connecting bolt 23 passes and is inserted / fixed to the lower part of the main nut 5. Furthermore, by being divisible, it can be assembled via a rear-mounting method similar to the aforementioned auxiliary nut 7.

[0135] Next, the pin fixing plate 11, to which the pin 9 is fixed, is fixedly assembled below the aforementioned main nut 5 and moves up and down integrally with the main nut 5.

[0136] In addition, in the first embodiment of the present invention, the auxiliary nut 7 is configured to have a recess 13 for inserting a pin 9, and the auxiliary nut 7 is also moved up and down via the pin 9 by the raising and lowering of the main nut 5.

[0137] It should be noted that the first embodiment of the present invention shows an example using a pin-fixing plate 11, but as another method, the pin 9 can also be directly assembled below the main nut 5. It should also be noted that the number of pins 9 can, for example, be as follows: Figure 9 As shown, there are two or more.

[0138] Moreover, the method of assembling pin 9 can of course be any other method.

[0139] In addition, as a mechanism for causing the auxiliary nut 7 to be driven by the lifting and lowering of the main nut 5, there are various methods besides the method described above that utilizes the pin 9.

[0140] —Specific examples of cases utilizing the auxiliary nut of the present invention—

[0141] The following describes a specific example of a heavy lifting device 33 utilizing the present invention. The present invention can be used as a device for lifting various heavy objects.

[0142] For example, as a specific example, in Figure 10 The image shows an application example of a conveyor device in a frying processing apparatus used in the manufacture of instant noodles. It should be noted that... Figure 10 A cross-sectional view of the frying processing apparatus is shown.

[0143] In addition, the dotted line portion is actually covered by the side panel, such as Figure 11 As shown, the heavy lifting device of the present invention is connected to the side panel.

[0144] —The overall structure of the frying processing device, including the conveyor—

[0145] like Figure 10 and Figure 11 As shown, in the conveying device of this frying processing apparatus, a pair of drive sprockets 37 and driven sprockets 39 are assembled in a manner that is parallel to a specified support body 35.

[0146] A pair of drive sprockets 37 are fixed to the support body 35 and connected to a specified power unit such as a motor. The driven sprocket 39 is mounted in a manner that allows it to slide horizontally. Figure 12 This is an enlarged view showing the vicinity of the driven sprocket 39, omitting the heavy lifting device and side panel 31 of the present invention.

[0147] The hanging counterweight 41 is connected to the driven sprocket 39 via the wire 43, giving the transmission device an outward tension force.

[0148] In addition, the tension of the conveyor chain 45 counteracts this tension force, and the driven sprocket 39 is located at the point where the two are balanced.

[0149] A pair of conveyor chains 45 are wound in a loop around the driven sprocket 39 and the drive sprocket 37, and the driving force of the drive sprocket 37 is transmitted to the driven sprocket 39.

[0150] It should be noted that, in addition to the drive sprocket 37 and the driven sprocket 39, there are multiple guides and sprockets that limit the direction of transport of the conveyor chain.

[0151] Additionally, between a pair of conveyor chains 45, the upper surface side becomes the transport surface for items, and as... Figure 13 As shown, a frame (holding member) 47 is connected to the transported item, which is then stored in the frame for transport.

[0152] In addition, after the item is transported, the mold 47, with its orientation reversed, is transported along the lower side of the conveyor chain 45, and this repetitive action is performed cyclically.

[0153] Next, a feeder 49 for feeding items is set near the driven sprocket 39, and items supplied from the top are sequentially fed to the mold frame.

[0154] In particular, in the case of manufacturing instant noodle blocks, a noodle feeder 49 is provided, in which groups of noodles hanging down from the upper conveyor belt are cut sequentially by a rotating blade, and the cut noodle groups are often fed to the mold frame near the driven sprocket 39, so that this conveying device can be properly utilized in the production of the noodle blocks.

[0155] In addition, in the conveyor belt transport surface, after the item to be fried is transported in the state of being supplied from the feeder, the mold frame 47 is transported and covered from the top with the cover body 53 before entering the frying tank 51, so that the mold frame 47 enters the frying tank 51 with the top pressed down by the cover body 53, thereby configuring the fried item not to fall off the mold frame 47 during the frying process.

[0156] It should be noted that, in order to restrict the track of the conveyor chain 45 in the frying tank 51, a track limiting bar 55 is appropriately provided inside the frying tank. The conveyor chain 45 is fixed in its transport track by being configured to pass through the track limiting bar 55.

[0157] Furthermore, upon leaving the frying tank 51, the upper cover 53 separates, and the mold frame 47 is transported as is. The mold frame 47, with the cover 53 detached, is reversed at the end of the transport surface, resulting in an inverted orientation, as shown below. Figure 10 , Figure 11 As shown, the fried food is received from the mold frame 47 in the reversed state by another conveyor belt 57 and transferred to the next process.

[0158] —A mechanism for raising and lowering a designated area on the transport surface side of the pair of conveyor chains—

[0159] Next, the frying processing apparatus includes a mechanism for raising and lowering a conveyor chain 45 over a defined area of ​​the transport surface on the upper side of the aforementioned conveying device. Figure 1 In the first embodiment of the present invention shown, a conveyor belt conveyor path of a conveying device is provided in the frying tank 51. During food production, the frying tank needs to be cleaned at the end of production or when changing product types. In such cases, the conveyor chain 45 and the mold frame 47 connected to the conveyor chain need to be moved from the conveyor belt conveyor path.

[0160] It has a mechanism for lifting and lowering the area of ​​the conveyor belt 45 passing through the frying tank 51 when the conveyor belt 45 is moved in this way.

[0161] In an embodiment of the present invention, regarding a specific area of ​​the conveyor chain 45 located in and near the frying tank of the conveying device, it is shown that the entire frame 61 of the conveyor chain, including the track limiting bar 55 that restricts the track in the frying tank and the cover conveying device 59 of the cover 53, is lifted (pushed up) upward using the weight lifting device 33 of the present invention.

[0162] The overall length of this frying processing device is not particularly limited. For example, it is sometimes about 10m to 30m. Sometimes the weight of the frame, which is lifted upwards and includes the conveyor chain through the frying tank area and the cover conveyor, is about 2000kg to 10000kg.

[0163] For such heavy objects, the heavy lifting device 33 of the present invention can be appropriately utilized.

[0164] Figures 14-16 The image shows the state in which the entire frame 61 of the above-mentioned frying processing apparatus, including the lid conveying device, is raised and lowered using the weight lifting device 33 of the present invention.

[0165] The heavy lifting device 33 of the present invention is provided with three units on each of the left and right sides of the frying processing device, for a total of six units on the left and right sides. For the rotation of the threaded shaft 1, a chain is wound on the sprocket 3 at the lower part to transmit the power of the separately installed motor, thereby enabling the threaded shaft to rotate.

[0166] By rotating the threaded shaft 1, according to... Figure 14 Figure 15 Figure 16 The change completes the lifting, in this Figure 16 In this state, the frying tank 51 is exposed, allowing the operator to clean the frying tank. It should be noted that the position of the driven sprocket 39 changes during the overall lifting of the frame, enabling the frame to rise smoothly.

[0167] In addition, an auxiliary nut 7 is installed below the main nut 5, which serves the following purpose: even if the main nut falls off due to wear, the auxiliary nut 7 will replenish it.

[0168] This application is based on Japanese application filed on September 29, 2023 (application number 2023-168933), the contents of which are incorporated herein by reference.

Claims

1. A heavy object lifting device, comprising: A rotating shaft having a threaded structure and being arranged in a generally vertical direction; The main nut, which is screwed onto the rotating shaft, supports the weight while raising and lowering it by rotating the rotating shaft; and An auxiliary nut, which is screwed onto the rotating shaft at a predetermined interval below the main nut, is driven by the rotation of the main nut in a manner that does not support the weight.

2. The heavy object lifting device according to claim 1, wherein, The auxiliary nut has a structure that can be divided into multiple sections along the longitudinal direction.

3. The heavy object lifting device according to claim 2, wherein, The multi-segmentation is a two-segmentation.

4. The heavy object lifting device according to claim 1 or 2, wherein, A pin is provided at the lower part of the main nut to make the auxiliary nut follow the main nut.

5. An auxiliary nut, which is the auxiliary nut used in the heavy lifting device according to any one of claims 1 to 4.

6. The heavy object lifting device according to claim 1 or 2, wherein, The heavy object lifting device is used as a mechanism in a conveying device to lift or lower a specific area. The conveying device includes: A pair of drive sprockets and driven sprockets are rotatably configured relative to the support body at a predetermined interval; A mechanism capable of moving the driven sprocket relative to the support body; A pair of annular conveyor chains are wound around the drive sprocket and the driven sprocket, and the upper side forms a transport surface for the articles; A mold frame, which is equally spaced and assembled between the pair of conveyor chains; and A mechanism for raising and lowering a specific area on the transport surface side of the pair of conveyor chains.

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