Heavy load lifting structure

Abstract

To develop a method to compensate for the nut falling off due to wear in a device that uses a screw shaft to raise and lower a heavy load with a nut.SOLUTION: By installing an auxiliary nut 7, which is threaded onto a rotation axis at a predetermined interval below a main nut 5 and follows the rotation of the main nut 5 without supporting a heavy load, together with the main nut 5 that rises and falls by rotating the rotation axis while supporting the heavy load, the auxiliary nut 7 prevents the heavy load from falling and complements the main nut 5 even if the main nut 5 falls due to wear or damage.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an apparatus for lifting and lowering a heavy load. [Background technology]

[0002] So-called screw jacks, which raise and lower a nut screwed onto a screw shaft by rotating the screw shaft to raise and lower a heavy load, are used in various fields. However, there are cases where the nut must be raised or lowered while supporting a heavy load, or must be kept supporting the heavy load, and the nut is susceptible to wear and breakage during these processes.

[0003] Here, it is conceivable that if the thread groove of the nut becomes non-functional due to wear or if damage occurs, the nut may fall downward together with the heavy object. It would be preferable to supplement the heavy load with another nut in advance so that the heavy load can be supported even in such an emergency. As examples of auxiliary nuts, the following prior art is disclosed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Actual work 61-1189

[0005] On the other hand, Patent Document 1 is intended to efficiently supply grease to lubricate the threaded portion, and is not intended to deal with emergencies such as the nut dropping due to wear or the like. Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the inventors of the present application set out to develop an alternative method for a device that uses a nut to raise and lower a heavy object via a screw shaft, which can compensate for the nut falling off due to wear or the like. [Means for solving the problem]

[0007] As a result of intensive research by the inventors, it was discovered that by attaching an auxiliary nut that is screwed onto the rotating shaft at a predetermined distance below the main nut and follows the rotation of the main nut without supporting a heavy load, in addition to a main nut that rises and falls by rotating a rotating shaft while supporting a heavy load, the auxiliary nut can prevent the heavy load from falling and complement the main nut even if the main nut falls due to wear or damage, etc.

[0008] That is, the first invention of the present application is "A rotating shaft having a screw structure and arranged in a substantially vertical direction, A main nut that is screwed onto the rotating shaft and moves up and down by rotating the rotating shaft while supporting a weight; and an auxiliary nut that is screwed onto a rotating shaft at a position below the main nut at a predetermined distance and that follows the rotation of the main nut without supporting the weight.

[0009] Next, it is preferable that the auxiliary nut can be divided into a plurality of parts in the vertical direction. By being able to divide it in this way, the auxiliary nut can be attached later. That is, the second invention of the present application is "A heavy-duty lifting device as described in claim 1, wherein the auxiliary nut has a structure that can be divided into several parts vertically."

[0010] Next, it is preferable that the auxiliary nut can be divided into a plurality of parts in the vertical direction. By being able to divide it in this way, the auxiliary nut can be attached later. That is, the third invention of the present application is "A heavy-duty lifting device as described in claim 2, wherein the multiple sections are divided into two sections."

[0011] Next, in order to cause the auxiliary nut to follow the main nut, it is preferable to use a method in which a rotational force is applied to the auxiliary nut by a pin provided on the lower part of the main nut to cause the auxiliary nut to follow the main nut. That is, the fourth invention of the present application is "A heavy-duty lifting device as described in claim 1 or 2, wherein a pin is provided at the lower part of the main nut for causing the auxiliary nut to follow the main nut."

[0012] Next, the applicant also intends to provide the auxiliary nuts themselves that are utilized in the first to fourth aspects of the present invention. That is, the fifth invention of the present application is "The auxiliary nut is used in the heavy load lifting device according to any one of claims 1 to 4."

[0013] Next, the heavy load lifting device of the present invention can be particularly suitably used in the configurations described as specific examples of cases in which the heavy load lifting device of this specification is used. That is, the sixth invention of the present application is "The heavy load lifting device, A pair of drive sprockets and driven sprockets rotatably disposed at a predetermined interval relative to the support; a mechanism for moving the driven sprocket relative to the support; A pair of endless conveyor chains are wound around the drive sprocket and the driven sprocket, and the upper side of the chain forms an article transport surface; Forms mounted at equal intervals between the pair of conveyor chains; A mechanism for raising and lowering a specific area on the conveying surface side of the pair of conveyor chains, The heavy-duty lifting device according to claim 1 or 2 is used as a mechanism for lifting a specific area. Effect of the Invention

[0014] By using the heavy load lifting device of the present invention, even in an emergency such as when the main nut is worn or damaged, the auxiliary nut complements the main nut, making it possible to prevent the heavy load from falling. [Brief description of the drawings]

[0015] [Figure 1] 1A and 1B are schematic overall front views of a first embodiment of a heavy object lifting device of the present invention and schematic overall front views showing changes when the device is lifted. [Diagram 2] FIG. 2 is a schematic perspective view showing the vicinity of an auxiliary nut according to the first embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic overall front view of the first embodiment of the present invention, and a schematic overall front view showing changes when a main nut shows wear or the like. [Figure 4] 1A to 1C are schematic overall front views showing the function of a confirmation pin in the first embodiment of the present invention and schematic overall front views showing changes thereof; [Diagram 5] FIG. 2 is a schematic perspective view showing a split state of the auxiliary nut according to the first embodiment of the present invention. [Figure 6] FIG. 4 is a schematic perspective view showing a direction in which the auxiliary nut of the present invention is divided. [Figure 7] 1 is a schematic perspective view showing a method for mounting an auxiliary nut of the present invention onto a screw shaft. FIG. [Figure 8] 1 is a schematic perspective view showing a pin fixing member (pin fixing plate) according to a first embodiment of the present invention. FIG. [Figure 9] FIG. 11 is a schematic perspective view showing another embodiment of the auxiliary nut of the present invention (when the auxiliary nut has two pins). [Figure 10] 1 is a schematic side view of a frying processing apparatus as an example in which a heavy object lifting device of the present invention is installed. [Figure 11] FIG. 2 is a schematic side view of a frying processing apparatus as an example of an apparatus equipped with a heavy object lifting device of the present invention, showing the apparatus including a side panel. [Figure 12] 1 is an enlarged schematic side view of a frying processing apparatus equipped with a heavy object lifting device of the present invention, showing the vicinity of a driven sprocket of the conveyor apparatus. FIG. [Figure 13] 1 is a schematic perspective view of a frame connected to a conveyor chain of a conveyor device in a frying processing apparatus equipped with a heavy object lifting device of the present invention; [Figure 14] This is a schematic side view showing the process of lifting a frame body including a specific area of ​​the conveyor chain of the conveyor device, a track regulating bar, and a lid conveyor device of the lid body, etc., in a frying processing apparatus equipped with the heavy object lifting device of the present invention. [Figure 15] 15 is a schematic side view showing the frame body in the middle of rising from FIG. 14. FIG. [Figure 16] FIG. 16 is a schematic side view showing the state in which the frame has completed rising from FIG. 15. [Explanation of symbols]

[0016] 1. Rotating shaft with a screw structure (screw shaft) 3 Sprockets 5 Main Nut 7 Auxiliary Nut 9-pin 11 Pin fixing member (pin fixing plate) 13 Recess 15 Support bar 17 Connecting bar 19 Confirmation pin 21 Connecting screw 23 Connecting bolt 31 Side plate 33 Heavy lifting equipment 35 Support 37 Drive sprocket 39 Driven sprocket 41 Weight 43 Wire 45 Conveyor Chain 47 Formwork 49 Feeding machine 51 Frying tank 53 Lid 55 Track control rod 57 Another conveyor 59 Lid conveyor device 61 Frame (including lid conveyor device, etc.) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The present invention will be described below with reference to the following embodiments, but the present invention is not limited to the following embodiments. The first invention of the present application is "A rotating shaft having a screw structure and arranged in a substantially vertical direction, A main nut that is screwed onto the rotating shaft and moves up and down by rotating the rotating shaft while supporting a weight; and an auxiliary nut that is screwed onto a rotating shaft at a position below the main nut at a predetermined distance and that follows the rotation of the main nut without supporting the weight.

[0018] The details of this will be explained below. Fig. 1 is a front view showing the whole of the heavy-duty lifting device of the present invention. Fig. 2 is a schematic perspective view showing the vicinity of the auxiliary nut.

[0019] ─Rotating shaft with screw structure─ The heavy load lifting device 33 of the present invention includes a rotating shaft (screw shaft) 1 having a screw structure. As shown in the first embodiment of Fig. 1, the rotating shaft 1 is placed vertically and is a screw shaft. The screw shaft 1 has a screw portion extending from the top to the bottom vicinity, and a cylindrical portion that does not have a screw groove and is continuous with the screw portion. A sprocket 3 is attached to the cylindrical portion so as to be positioned horizontally, and a separate chain is attached to the sprocket 3 so that it can rotate in conjunction with a power unit (not shown). Furthermore, bearings, gears, supports, etc. are provided as appropriate to hold the screw shaft 1 vertically and enable it to rotate.

[0020] Next, a main nut 5 that screws onto the screw shaft 1 is first attached to the screw shaft 1. In addition, a pin fixing member 11 having a pin 9 for promoting the following movement of an auxiliary nut 7, which will be described later, is attached to the lower part of the screw shaft 1. Furthermore, an auxiliary nut 7 is provided at a predetermined interval to be screwed onto the shaft 1, and the auxiliary nut 7 is fitted so that the tip of the pin 9 engages with a recess provided therein. For convenience, in FIG. 1, the main nut and the pin fixing member are shown in cross section, and the pin 9 and the auxiliary nut 7 are shown in front view.

[0021] Next, a cylindrical support bar 15 is attached to the main nut 5 by being inserted into the side surface of the main nut 5 from above, and is fixed integrally with the main nut 5 by a screw. A connecting bar 17 for connecting to a predetermined load is provided on the upper portion of the cylindrical support bar 15. The load is applied to the main nut 5 via the support bar 15. On the other hand, the auxiliary nut 7 is not subjected to any load.

[0022] ─Lifting heavy objects─ As shown in Figure 1, in the first embodiment of the present invention, in order to lift a heavy object upward (jack up), a sprocket 3 attached to a screw shaft 1 is rotated. On the other hand, the main nut 5 screwed onto the screw shaft 1 cannot rotate because the load of the heavy object is applied to it via a support bar. Therefore, when the screw shaft 1 rotates, the main nut screwed onto the screw shaft rises as shown in Figure 1. In this way, the main nut 5 rises, allowing the load (heavy object) to be lifted.

[0023] Incidentally, the screw shaft may be rotated by connecting it to a predetermined motor, or may be rotated manually. In the first embodiment of the present invention, a chain is wound around the sprocket 3 and connected to a predetermined power unit to apply a rotational force. Next, the auxiliary nut 7 is screwed onto the screw shaft 1 at a predetermined distance from the main nut 5 and the pin fixing member 11. In addition, the auxiliary nut 7, which engages with the main nut 5 via the pin 9, moves following the main nut 5, so that the auxiliary nut 7 also rises together with the main nut 5.

[0024] Moreover, under normal conditions, the auxiliary nut 7 is merely driven by the main nut 5, and is not subjected to any load from above. Conversely, when lowering a load (heavy object), the main nut 5 can be lowered by rotating the screw shaft in the opposite direction to the previous direction, and the heavy object will also be lowered accordingly.

[0025] ─In case of wear or damage to the main nut─ In the heavy load lifting device 33 of the present invention, even if the above-mentioned main nut 5 is damaged or falls downward, the auxiliary nut 7 is configured to complement the main nut 5 as an emergency measure. In the configuration of the present invention, since a load is applied to the main nut 5, the main nut is prone to wear and damage during the process of moving the main nut up and down. Here, as shown in FIG. 3, in the unlikely event that the thread groove on the main nut side becomes non-functional due to wear or is damaged, the main nut 5 may fall downward.

[0026] On the other hand, under normal conditions, the auxiliary nut 7 simply rotates in response to the rotation of the main nut 5 and is not subjected to any load from above, so wear and damage to the auxiliary nut 7 is much less likely to occur than to the main nut 5. For this reason, if the main nut 5 falls due to wear or damage to the thread groove of the main nut 5, it will fall the distance between it and the auxiliary nut 7. However, in such an emergency, the auxiliary nut 7 can absorb this fall, limiting the fall of the load and preventing the fall of heavy objects and serious accidents.

[0027] Furthermore, if the main nut falls, the support bar 15 will also fall. In order to detect such abnormalities, a confirmation pin 19 mechanism is provided that, under normal conditions, penetrates horizontally through the side portion of the support bar 15 and directly above the upper end of the screw shaft 1 as shown in Figure 4. In the event of an abnormality, the main nut 5 and support bar 15 will fall and the confirmation pin 19 will no longer be able to be inserted, making it possible to detect an abnormality. In particular, the mechanism of the confirmation pin 19 is an effective confirmation method when the main nut 5 and the auxiliary nut 7 cannot be seen from the outside due to a cover or the like.

[0028] The auxiliary nut has a structure that can be divided into multiple parts in the vertical direction. In the present invention, it is preferable that the auxiliary nut 7 has a structure that can be divided into multiple parts in the vertical direction. That is, for example, in the first embodiment of the present invention shown in the drawings, the auxiliary nut 7 can be divided into two parts in the vertical direction as shown in Fig. 8, and can be formed as one piece by attaching two connecting screws 21 each at the front and rear that are inserted horizontally as shown in Fig. 5.

[0029] It is to be noted that the method of division is not limited to two divisions, and it may of course be three, four or more divisions. Furthermore, being vertically divisible in this application means that the auxiliary nut 7 is divisible in the direction of the spiral progression of the thread groove (vertical direction), and it is to be noted that the direction of division need not necessarily be parallel to the spiral progression direction of the thread groove as shown in Fig. 6, but may be oblique or curved. Furthermore, the method for reintegrating the divided auxiliary nuts 7 is not limited, and various means such as a bolt and nut, welding, etc. are possible.

[0030] In this way, by making it possible to form the auxiliary nut 7 in a divisible manner, there is an advantage that the auxiliary nut 7 can be attached later to a heavy-duty lifting device that already has only the screw shaft 1 and main nut 5 attached. In other words, when attempting to retrofit the auxiliary nut 7 to a heavy load lifting device for lifting and lowering a heavy load that does not have the auxiliary nut 7, that is, when only the screw shaft 1 and main nut 5, etc. are attached to support the heavy load, if the auxiliary nut 7 cannot be separated, it is necessary to remove the main nut 5 from the screw shaft 1, re-attach the auxiliary nut 7, and then attach the main nut 5.

[0031] In this way, completely separating the screw shaft 1 and the main nut 5 requires moving heavy objects, which can be a complicated task and is often a difficult situation. On the other hand, if the auxiliary nut 7 can be divided into several parts, the auxiliary nut 7 can be attached after the load is already being supported by the main nut 5, as shown in FIG. 7, which has the advantage of making the work easier and allowing for quick response. Furthermore, in the first embodiment of the present invention, it is necessary to design the structure so that the pin 9 is inserted later. In such a case, if the auxiliary nut 7 is not made divisible, there is a risk that restrictions will arise in the assembly procedure and structure. In other words, if the structure is separable, there is an effect that the auxiliary nut 7 can be attached in accordance with the position (phase) of the pin 9 to be fixed.

[0032] --Mechanism for making the auxiliary nut follow the rotation of the main nut-- In the present invention, a mechanism for making the auxiliary nut 7 follow the main nut 5 is required. Various methods can be selected for the follower mechanism. For example, the first embodiment of the present application discloses a method using a pin fixing member (pin fixing plate) 11 attached below the main nut. 1 and 2, a pin fixing plate 11 divided into two parts and not having a thread groove 1 is used as shown in Fig. 8, and a connecting bolt 23 is inserted from the lower part of the plate and inserted and fixed into the lower part of the main nut 5. Also, by making it separable, it can be attached later in the same way as the auxiliary nut 7 described above.

[0033] Next, the pin fixing plate 11 to which the main pin 9 is fixed is fixedly attached below the main nut 5 described above, and moves up and down together with the main nut 5. In addition, in the first embodiment of the present invention, a recess 13 into which a pin 9 is inserted is formed in the auxiliary nut 7, and the auxiliary nut 7 is configured to rise and fall in response to the rise and fall of the main nut 5 via the pin 9. Although the first embodiment of the present invention has been described by way of example using the pin fixing plate 11, other methods may be used, such as directly attaching the pin 9 below the main nut 5. Of course, the number of pins 9 may be two or more, for example, as shown in FIG.

[0034] Furthermore, it goes without saying that various other methods for mounting the pin 9 are possible. Furthermore, as a mechanism for causing the auxiliary nut 7 to follow the up and down movement of the main nut 5, various mechanisms are possible other than the above-mentioned method using the pin 9.

[0035] --Example of use of the auxiliary nut of the present invention-- A specific example using the heavy load lifting device 33 of the present invention will be described below. The present invention can be used as a device for lifting various heavy loads. For example, as a specific example, Fig. 10 shows an application example to a conveyor device in a frying processing device used in the production of instant noodles. Note that Fig. 10 shows a cross-sectional view of the frying processing device.

[0036] In reality, the dotted line portion is covered with a side panel, and as shown in FIG. 11, the heavy load lifting device of the present invention is connected to the side panel.

[0037] --Overall configuration of frying processing device including conveyor device-- As shown in FIGS. 10 and 11, in the conveyor device of the frying processing device, a pair of a driving sprocket 37 and a driven sprocket 39 are mounted on a predetermined support 35 so as to be arranged in parallel. Of these, a pair of driving sprockets 37 are fixed to the support 35 and connected to a predetermined power unit such as a motor unit. The driven sprocket 39 is mounted so that it can slide horizontally. Figure 12 is an enlarged view showing the heavy load lifting device of the present invention and the vicinity of the driven sprocket 39 with the side panel 31 omitted.

[0038] A hanging weight 41 is connected to the driven sprocket 39 via a wire 43, and is given a tension force acting in an outward direction relative to the conveyor device. Furthermore, the tension of the conveyor chain 45 opposes the tension force, and the driven sprocket 39 is located at the point where the two are balanced.

[0039] A pair of conveyor chains 45 are wound around the driven sprocket 39 and the driving sprocket 37 in an endless manner, so that the driving force of the driving sprocket 37 is transmitted to the driven sprocket 39. In addition to the driving sprocket 37 and the driven sprocket 39, a number of guides and sprockets are provided to regulate the direction of conveyance of the conveyor chain. Between the pair of conveyor chains 45, the upper surface serves as the transport surface for articles, and a formwork (retainer) 47 is connected as shown in FIG. 13, so that the articles to be transported are stored within the formwork and transported.

[0040] After the article has been transported, the inverted formwork 47 is transported along the lower side of the conveyor chain 45, and this process is repeated in a circular fashion. Next, a feeder 49 for feeding articles is installed near the driven sprocket 39, so that articles are fed from above and sequentially into the formwork. In particular, when producing noodle blocks for instant noodles, a noodle supplying machine 49 is installed and a group of noodle strands hanging down from an upper conveyor is often cut in sequence by a rotating blade, and the cut group of noodle strands is supplied to a form near the driven sprocket 39, and this conveyor device can be ideally used for producing such noodle blocks.

[0041] In addition, on the conveyor transport surface, after the items to be fried are supplied from a feeder and transported, a lid 53 is placed over the top of the formwork 47 before the formwork 47 is transported and enters the frying tank 51, and the formwork 47 enters the frying tank 51 while still holding down the top of it with the lid 53, so that the fried items do not fall off the formwork 47 while they are being fried. In order to regulate the trajectory of the conveyor chain 45 in the frying tank 51, a trajectory regulation bar 55 is appropriately provided in the frying tank. The conveyor chain 45 is configured to pass through the trajectory regulation bar 55, thereby fixing the transport trajectory of the conveyor chain 45.

[0042] Furthermore, when the mold 47 is removed from the frying tank 51, the upper lid 53 is detached and the mold 47 is transported alone. With the lid 53 removed, the mold 47 is inverted and faces upside down at the end of the transport surface, and as shown in Figures 10 and 11, another transport conveyor 57 receives the fried food from the mold 47 in the inverted state and transfers it separately to the next process.

[0043] --Mechanism for raising and lowering a predetermined area on the conveying surface side of the pair of conveyor chains-- Next, the frying processing apparatus has a mechanism for raising and lowering a conveyor chain 45 in a predetermined area of ​​the upper transport surface of the conveyor device. In a first embodiment of the present invention shown in Figure 1, a conveyor transport path of the conveyor device is provided in a frying tank 51. In food production, it is necessary to clean the frying tank when the production is completed or when changing the type of food. In this case, it is necessary to move the conveyor chain 45 and the formwork 47 connected to the conveyor chain from the transport path of the conveyor.

[0044] In this manner, when the conveyor chain 45 is moved, a mechanism is provided for raising and lowering the area of ​​the conveying surface of the conveyor chain 45 passing through the frying tank 51 . In an embodiment of the present invention, for a specific area of ​​a conveyor chain 45 located within the frying tank of the conveyor device and in its vicinity, the entire frame body 61 including a track regulating rod 55 that regulates the track of the conveyor chain within the frying tank and a lid conveyor device 59 of the lid body 53 is lifted upward (jacked up) by the heavy load lifting device 33 of the present invention.

[0045] The overall length of this frying processing apparatus is not particularly limited, but may be, for example, approximately 10 m to 30 m, and the weight of the entire frame, including the area where the conveyor chain passes through the frying tank and the lid conveyor apparatus that is lifted upward as described above, may be approximately 2,000 kg to 10,000 kg. The heavy load lifting device 33 of the present invention can be suitably used for such heavy loads. 14 to 16 show a state in which the entire frame 61 including the lid conveyor device of the above-mentioned frying processing device is raised and lowered by using heavy object lifting device 33 of the present invention.

[0046] The heavy load lifting device 33 of the present invention is installed in 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. A chain is wound around the sprocket 3 at the lower part to rotate the screw shaft 1, and the power of the motor unit, which is installed separately, is transmitted to rotate the screw shaft.

[0047] Rotating the screw shaft 1 changes the state from Fig. 14 to Fig. 15 to Fig. 16, and the jacking up is completed, with the frying tank 51 exposed in the state shown in Fig. 16, allowing workers to clean the inside of the frying tank, etc. The position of the driven sprocket 39 is changed in the process of raising the entire frame, making it possible to raise the entire frame smoothly. In addition, an auxiliary nut 7 is attached to the lower part of the main nut 5, so that even if the main nut falls off due to wear or the like, the auxiliary nut 7 plays a role in complementing it.

Claims

1. A rotating shaft having a screw structure and disposed in a substantially vertical direction; A main nut that is screwed onto the rotating shaft and moves up and down by rotating the rotating shaft while supporting a weight; a main nut that is threadedly engaged with a rotating shaft at a predetermined distance below the main nut and that follows the rotation of the main nut without supporting the heavy load.

2. The heavy-duty lifting device according to claim 1 , wherein the auxiliary nut has a structure that can be divided into a plurality of parts in the vertical direction.

3. 3. The heavy-duty lifting device according to claim 2, wherein the plurality of divisions are two divisions.

4. 3. A heavy load lifting device according to claim 1, further comprising a pin provided at a lower portion of said main nut for causing said auxiliary nut to follow said main nut.

5. The auxiliary nut is used in the heavy load lifting device according to any one of claims 1 to 4.

6. The heavy object lifting device, A pair of drive sprockets and driven sprockets rotatably disposed at a predetermined interval relative to the support; a mechanism for moving the driven sprocket relative to the support; A pair of endless conveyor chains are wound around the drive sprocket and the driven sprocket, and the upper side of the chain forms an article transport surface; Forms mounted at equal intervals between the pair of conveyor chains; A mechanism for raising and lowering a specific area on the conveying surface side of the pair of conveyor chains, 3. The heavy load lifting device according to claim 1, which is used as a mechanism for lifting a specific area.

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