JP2007177880A - Spherical bearing and load cell anti-vibration device equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spherical bearing easy to construct, small, inexpensive, strong enough to endure a great load, and easy to machine even if it is formed of stainless steel, and also to provide a load cell anti-vibration device equipped therewith. <P>SOLUTION: The spherical bearing 145 comprises a bearing body 150 and a shaft pin 143. The bearing body 150 consists of a bearing housing part 150b and a mounting rod part 150a. The bearing housing part 150b has a straight hole 150c. The shaft pin 143 consists of supporting portions 143a at both ends and a spherical portion 143b. Thorough the straight hole 150c, the spherical portion 143b is inserted in a rotationally slidable manner so that the bearing body 150 and the shaft pin 143 are combined to construct the spherical bearing 145. The spherical bearing 145 and a spherical bearing 146 having the same construction thereas are provided in the anti-vibration device 140 for a load cell 110. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The invention of the present application relates to a spherical bearing having a novel structure suitable for application to a load cell steadying device used in a weight measuring system for contents of large containers such as hoppers and tanks, and a load cell equipped with the spherical bearing. The present invention relates to a steady rest device.

  The weight measurement system for large containers such as hoppers and tanks using load cells supports various hoppers and tanks with multiple self-aligning load cells, measures the weight of the contents, and based on the results. It controls the upper / lower limit of weight and the supply / discharge of contents. Such a load cell must always be able to accurately measure the entire weight of the contents as a vertical load even if the hopper or tank is swung due to strong winds or earthquakes. For this reason, an anti-sway device that restricts the swing of a hopper, a tank, or the like within a certain range has been conventionally used.

  There are two types of such a steady rest device. One is called a flexible stop system, which includes a steady rest device composed of one rod or rod-like body and two spherical bearings (also called rod end bearings) disposed at both ends thereof. A plurality of circumferentially spaced intermediate containers are installed between the large container and the foundation gantry, and these multiple steady rests restrict the horizontal relative movement between the large container and the foundation gantry. In this way, the large container is swung by an external force such as strong wind or earthquake, and the rotation of the rod in the two spherical bearings of each steadying device and the resulting displacement of the rod Therefore, the rocking is restricted to a predetermined range. And, since the absorption and regulation of the swing of the large container by each of the steady rest devices is performed in the same manner in any steady rest device, the center position of the large container does not change during this period, The weight of the contents of the load cell is accurately measured. This point will be described later in detail with reference to FIG.

  The other method is called a check rod method (abutment method), which is an impactor (consisting of a rod, a cylindrical body, etc.) provided on either side of a large container or a foundation frame. The collider (made of a cylindrical member, rod, plate member having a circular hole, etc.) provided on the other side is arranged with a predetermined gap, and the large container is swung by strong winds, earthquakes, etc. When the two colliders collide with each other, the swing is absorbed and restricted to a predetermined range.

  In FIGS. 5 and 6, the hopper 1 in which contents such as food processing materials are accommodated is supported by the load cell 10 at three locations in the outer peripheral direction, and the weight of the contents is measured. It is shown in the figure. Here, for the steadying of the load cell 10, the above-described flexible stop type steadying device 40 (see FIGS. 7 and 8) is used. 5 is a front view of the hopper 1, FIG. 6 is a plan view of the hopper 1, FIG. 7 is an enlarged view of a main part of FIG. 5, and FIG. FIG.

  In these drawings, the load cell 10 is disposed between an upper pressure plate 21 fixed to the lower surface of the bracket 20 protruding from the peripheral wall of the hopper 1 and a lower pressure plate 31 fixed to the upper surface of the gantry 30. Although not shown in detail, the upper and lower portions are both supported by a spherical bearing and interposed. In this way, even if the hopper 1 is slightly swung due to strong winds, earthquakes, etc., the spherical concave portions of the upper and lower pressure plates 21 and 31 and the upper and lower spherical pressure receiving surfaces of the load cell 10 in the upper and lower spherical bearing portions. When the swing of the hopper 1 is absorbed and strong winds, earthquakes, etc. are subsided, the hopper 1 is automatically aligned (this is based on the load cell 10 automatic alignment operation). ), The hopper 1 is immediately returned to its original state, and the weight of the contents can be accurately measured.

  When the strength of the external force such as strong wind or earthquake is relatively small, the swaying of the hopper 1 and the self-aligning action of the hopper 1 by the spherical bearing portions respectively provided on the upper and lower portions of the load cell 10 as described above. Thus, it is possible to accurately measure the weight of the contents while preventing the hopper 1 from being displaced. However, when the strength of the external force such as strong wind or earthquake is higher than that, the hopper 1 remains displaced or falls down. As a result, the load cell 10 swings from its vertical posture, and the entire weight of the contents of the hopper 1 cannot be picked up as a vertical load, and accurate measurement of the weight of the contents becomes impossible. . Therefore, in order to avoid such a situation, the above-described steadying device 40 is usually attached to this type of weight measurement system.

  As described above, the steadying device 40 of the load cell 10 used for measuring the weight of the contents of the hopper 1 shown in FIGS. 5 and 6 belongs to what is called the flexible stop method. Consists of structure.

  As shown in FIG. 7, the upward support bracket 41 erected on the lower pressure plate 31 on the gantry 30 side is pivotally supported by a shaft pin 43 inserted through a pin hole formed at the upper end portion thereof. A spherical bearing 45 is attached. The spherical bearing 45 has a spherical bearing portion on the side pivoted by the shaft pin 43. Similarly, a downward support bracket 42 suspended from the upper pressure plate 21 on the hopper 1 side is pivotally supported by a shaft pin 44 inserted through a pin hole formed at the lower end thereof, and a spherical bearing 46 is provided. Is installed. The spherical bearing 46 also has a spherical bearing portion on the side pivoted by the shaft pin 44, and has the same structure as the spherical bearing 45.

  Here, the spherical bearing 45 has the following structure. As described above, the structure of the spherical bearing 46 is the same as that of the spherical bearing 45, and therefore the description thereof is omitted. However, in the following description, when the details of the spherical bearing 46 are referred to, the spherical bearing 46 is described. The reference numerals assigned to the corresponding details of 45 are denoted by “′” (see FIG. 10).

  As shown in FIGS. 10 and 11, the spherical bearing 45 includes a bearing body 50 including a neck mounting rod portion 50a and a head bearing housing portion 50b, and a ball 51 having a spherical outer surface. And a race 52 having a spherical inner peripheral surface which is fitted in a circular hole formed in the center portion of the bearing housing portion 50b of the bearing body 50 and slides. The shaft pin 43 penetrates the central portion of the ball 51 of the spherical bearing 45 tightly and is integrally coupled thereto, and both end support portions thereof are supported by the bracket 41. Therefore, when an external force is applied to change the attitude of the bearing body 50 from the mounting rod portion 50a side, the inner peripheral surface of the race 52 slides on the outer surface of the ball 51, and the bearing body 50 It can swing freely in the three-dimensional space in the region and take any posture.

  As shown in FIGS. 7 and 8, the spherical bearing 45 and the spherical bearing 46 having such a structure are placed in an arrangement relationship facing each other, and the upper end portion of the upward support bracket 41 and the downward support bracket are arranged. The shaft pins 43 and 44 are pivotally supported by the lower end portions of 42 and are respectively mounted. Then, the mounting rod portion 50a of the spherical bearing 45 and the mounting rod portion 50a ′ of the spherical bearing 46 are connected via turnbuckles 47 having screw coupling portions to the respective portions at both ends. One rod-like body R formed by combining the mounting rod portions 50a, 50a ′ and the turnbuckle 47 is formed. Reference numerals 48 and 49 denote locking nuts. In this way, the one-side spherical bearing 45 and the other-side spherical bearing 46 are connected via the turnbuckle 47, whereby the steadying device 40 is completed.

  Therefore, now assuming that the hopper 1 is swung in a horizontal plane due to external force such as strong wind or earthquake, the anti-sway device 40 has a ball bearing portion of the spherical bearing 46 in which the inner peripheral surface of the race 52 ′ is a ball. At the same time, the inner peripheral surface of the race 52 slides on the outer surface of the ball 51 in the spherical bearing portion of the spherical bearing 45, and as a result, the rod-shaped body R is displaced by a predetermined amount. This absorbs the swing of the hopper 1 and regulates it within a predetermined range.

  Moreover, since such an anti-skid device 40 is installed at three locations in the circumferential direction of the hopper 1 at equal intervals, as shown in FIG. 9, the anti-skid device 40 is received by the anti-skid device 40 installed at each location. The oscillating displacements of the hopper 1 cancel each other, and the point C that is the center of the hopper 1 in plan view becomes a substantially completely stationary point, and the hopper 1 has no influence on the weight measuring action of the load cell 10. . In this way, the load cell 10 can always accurately measure the weight of the contents of the hopper 1.

  This will be described in more detail with reference to FIG. 9. In FIG. 9, three thick solid lines indicate the rod-shaped bodies R (the mounting rod portions 50a and 50a ′ and the turnbuckle 47). The point A on one end side of the spherical bearing 45 indicates the center point in the spherical bearing portion, which is a fixed point on the gantry 30 side. Further, the point B on the other end side indicates a center point in the spherical bearing portion of the spherical bearing 46, which is a swing point on the hopper 1 side.

  Therefore, now, assuming that the hopper 1 is swung in the horizontal plane due to an external force such as strong wind or earthquake, the point B on the hopper 1 side is the length of the corresponding rod-shaped body R around the corresponding point A. Move on a circle with a radius of. At this time, since the rotation of the triangle BBB is stopped by the three rod-shaped bodies R, the movement locus of the center (the center of the hopper 1) C point is the same as the movement locus of the point B. Therefore, the movement trajectories of the three points B try to cause the movement trajectories of the three points C corresponding to the respective movement trajectories, and the movement trajectories of these three points C are the initial positions of the points C. Since this point is the only coexistence position, it cannot move from this position, and the point C becomes a point that is almost completely stationary at its initial position.

  In addition, when the hopper 1 expands or contracts, the point B can freely move to a point B ′ that is a point on the circumference having the length of the rod-shaped body R as a radius. Shrinkage is free to let these escape. Therefore, also in this case, the center position of the hopper 1 is not moved, and the hopper 1 itself can freely expand and contract without affecting the weight measuring action of the load cell 10.

  In the steady rest device 40 having the structure and operation as described above, the spherical bearing 45 applied thereto (the same applies to the spherical bearing 46, but the spherical bearing 45 will be described below as a representative example. ) Is composed of three parts: a bearing body 50, a ball 51 and a race 52. For this reason, the conventional spherical bearing 45 becomes large, and if it is to be miniaturized as much as possible, high-strength, expensive materials must be used, and there are many processing steps in production, which makes it expensive. It was.

Further, in the weight measurement system for the contents of large containers such as hoppers and tanks that contain contents such as food processing materials, the spherical bearing 45 provided in the steadying device 40 of the load cell 10 used there is a strong wind or earthquake. Since it is only necessary to prevent the large container from swinging greatly due to the external force, it may not be a strict sliding bearing. Then, the bearing surface on the bearing body 50 side is made into a straight hole, the shaft pin 43 is spherically processed, the ball is integrated with the shaft pin (manufactured integrally with the same material), and the conventional independent ball 51 is omitted. However, it is only necessary that the necessary movement on the bearing body 50 side is made possible.
From this point of view, the conventional spherical bearing 45 (see Patent Documents 1 and 2) includes a ball 51 as an independent part which is an unnecessary part, and performs excessive bearing surface forming processing on the bearing body 50 side. That's right.

Further, in the same weight measurement system, regarding the load cell 10 and the steadying device 40 used there, not only the load cell 10 but also the steadying device 40 is required to be made of all stainless steel. However, if it is made of stainless steel and the strength to cope with a heavy load is to be ensured, the spherical bearing 45 provided in the steady rest device 40 becomes a large size or a small size so that it has a strength such as SUS630. If expensive ones are used, they must be expensive. Conventionally, it has been difficult to manufacture a compact and inexpensive anti-slip device 40 made of stainless steel, and this has not been available.
Japanese Utility Model Publication No. 5-50147 JP 2004-359402 A

  The invention of the present application solves the above-mentioned problems of the conventional spherical bearing and the load cell steadying device provided with the spherical bearing, has a simple structure, is made of stainless steel, is small, It is an object of the present invention to provide a spherical bearing that is inexpensive, can secure a strength that can handle a large load, and is easy to process, and a load cell steadying device including the spherical bearing.

  The above problems can be solved by the following invention described in each claim of the present application. That is, in the invention described in claim 1, the spherical bearing includes a bearing body and a shaft pin, and the bearing body includes a bearing housing portion of a head portion and a mounting rod portion of a neck portion. A straight hole is formed in the bearing housing portion, and the shaft pin includes a support portion at both ends and a spherical portion at the center portion, and the spherical portion is inserted into the straight hole so as to be freely slidable. Thus, the spherical bearing is characterized in that the bearing body and the shaft pin are combined.

Since the invention described in claim 1 is configured as described above, the spherical bearing is composed of only two parts, that is, a bearing body and a shaft pin having a spherical portion, which is compared with a conventional spherical bearing. Then, the ball as an independent part is omitted, and the number of parts is reduced by one. As a result, a spherical bearing having a simple structure and a reduced size can be obtained.
In addition, when trying to obtain a spherical bearing of the same size as the size of the spherical bearing can be reduced, the thickness t of the peripheral wall of the bearing housing portion left by forming a straight hole in the bearing housing portion of the bearing body is left. Can be made relatively large, making it possible to manufacture spherical bearings using low-strength, inexpensive stainless steel materials. Even if they are made of stainless steel, they are small, inexpensive, and have a large load. Can be obtained.

  In addition, the spherical bearing portion is configured by a freely slidable combination of the straight hole on the bearing body side and the spherical portion on the shaft pin side, so that a spherical inner periphery that slides on the spherical portion on the shaft pin side is provided. It is not necessary to form the surface on the bearing body side, and the processing of the spherical bearing portion including the processing of the spherical portion on the shaft pin side becomes extremely easy. Specifically, both the straight hole on the bearing body side and the spherical surface on the shaft pin side can be processed with only an NC lathe and no heat treatment is required, so no dedicated equipment is required, Spherical bearings can be manufactured at low cost.

  Further, in the invention described in claim 2, in the spherical bearing according to claim 1, the diameter of the support portion at both ends and the diameter of the spherical portion at the center portion are the same. It is a feature.

  Since the invention described in claim 2 is configured as described above, it is possible to minimize a gap between a plurality of members surrounding the spherical bearing portion, and to minimize dust entering the spherical bearing portion. And the durability of the spherical bearing can be improved. Moreover, the maintenance becomes easy.

  Further, the invention described in claim 3 is the spherical bearing according to claim 1 or 2, wherein the spherical bearing is made of stainless steel.

  Since the invention described in claim 3 is configured as described above, as described above, the spherical bearing is made of stainless steel, is small, inexpensive, and secures strength capable of handling a large load. Can be obtained.

  In the invention described in claim 4, the load cell steadying device used in the weight measuring system for heavy objects is rotatably connected to the base side via the first spherical bearing portion. A first spherical bearing; a second spherical bearing rotatably connected to a heavy object side via a second spherical bearing portion; a free end side of the first spherical bearing; and the second spherical surface It comprises a connecting member that connects the free end side of the bearing, and the first spherical bearing and the second spherical bearing are the spherical bearings according to any one of claims 1 to 3. This is a load cell steadying device.

  Since the invention described in claim 4 is configured as described above, the load cell steadying apparatus capable of producing the effects of the invention described in any one of claims 1 to 3 described above. Can be provided.

  As described above, according to the spherical bearing of the invention of the present application, it is possible to obtain a spherical bearing with a simple structure and a reduced size. In addition, when trying to obtain a spherical bearing of the same size as the size of the spherical bearing can be reduced, the thickness t of the peripheral wall of the bearing housing portion left by forming a straight hole in the bearing housing portion of the bearing body is left. Can be made relatively large, making it possible to manufacture spherical bearings using low-strength, inexpensive stainless steel materials. Even if they are made of stainless steel, they are small, inexpensive, and have a large load. Can be obtained.

  In addition, the spherical bearing portion is configured by a freely slidable combination of the straight hole on the bearing body side and the spherical portion on the shaft pin side, so that a spherical inner periphery that slides on the spherical portion on the shaft pin side is provided. It is not necessary to form the surface on the bearing body side, and the processing of the spherical bearing portion including the processing of the spherical portion on the shaft pin side becomes extremely easy. Specifically, both the straight hole on the bearing body side and the spherical surface on the shaft pin side can be processed with only an NC lathe and no heat treatment is required, so no dedicated equipment is required, Spherical bearings can be manufactured at low cost.

Furthermore, it is possible to provide a load cell steadying device provided with a spherical bearing capable of producing such an effect.
In addition, various effects as described above can be achieved.

  It is assumed that the spherical bearing is composed of a bearing body and a shaft pin. The bearing body includes a bearing housing portion at the head portion and a mounting rod portion at the neck portion, and a straight hole is formed in the bearing housing portion. The shaft pin is composed of support portions at both ends and a spherical portion at the center. Then, the spherical portion is inserted into the straight hole so as to be rotatable and slidable, and the bearing body and the shaft pin are combined to form a spherical bearing. The spherical bearing is made of stainless steel.

  Further, a load cell steadying device used in a weight measurement system for heavy objects includes a first spherical bearing rotatably connected to a base side via a first spherical bearing part, and a heavy object side. A second spherical bearing rotatably connected via a second spherical bearing, and a connecting member connecting the free end side of the first spherical bearing and the free end side of the second spherical bearing; Shall be. The above-described spherical bearings are used as the first spherical bearing and the second spherical bearing.

Next, an embodiment of the present invention will be described.
FIG. 1 is a plan sectional view of a spherical bearing of the present embodiment, FIG. 2 is a sectional side view of the spherical bearing, FIG. 3 is a front view of a load cell steadying device including the spherical bearing, and FIG. FIG. 4 is a plan sectional view taken along line XX in FIG. In addition, each part of the spherical bearing and the steadying device of the present embodiment is attached to each corresponding part of the conventional spherical bearing (see FIGS. 10 and 11) and the steadying device (see FIGS. 7 and 8). A numerical code obtained by adding 100 to the numerical code is attached.

  The spherical bearing 145 (first spherical bearing) of this embodiment includes a bearing body 150 and a shaft pin 143 as shown in FIGS. The bearing body 150 includes a neck mounting rod portion 150a and a head bearing housing portion 150b. The bearing housing portion 150b has a straight hole 150c formed of a cylindrical peripheral surface. The shaft pin 143 includes a support portion 143a at both ends and a spherical portion 143b at the center, and the diameters thereof are the same (φ). A spherical portion 143b is inserted into the straight hole 150c so as to be freely slidable. The bearing body 150 and the shaft pin 143 are combined in this way to form a spherical bearing 145. The spherical bearing 145 is made of stainless steel, and can be manufactured using a relatively low-strength austenitic stainless steel such as SUS304.

The spherical bearing 145 of the present embodiment is configured as described above, and when compared with the conventional spherical bearing 45 (see FIGS. 10 and 11), the ball 51 as a conventional independent part is omitted. Instead, a spherical portion 143b is formed directly on the shaft pin 143. That is, the ball 51 in the conventional spherical bearing 45 is integrated (manufactured integrally with the same material) with the shaft pin 143 in the spherical bearing 145 of this embodiment. Further, in the spherical bearing 145 of the present embodiment, the race 52 is also omitted, and the bearing surface that receives the spherical portion 143b is formed directly on the bearing housing portion 150b of the bearing body 150, and has a spherical inner periphery. It is not a surface but a straight circular hole (cylindrical peripheral surface) 150c. Further, the axial length of the conventional ball 51 is made larger than the thickness of the bearing housing portion 50b. However, in the spherical bearing 145 of the present embodiment, the axial length of the spherical portion 143b is the thickness of the bearing housing portion 150b. It is stored inside.
As a result, the spherical bearing 145 of the present embodiment is simplified in structure and reduced in size as compared with the conventional spherical bearing 45.

3 and 4 show the steadying device 140 of the load cell 110 to which the spherical bearing 145 of the present embodiment configured as described above is applied.
The load cell 110 is the same as the conventional load cell 10, and the basic structure of the steadying device 140 is the same as that of the conventional steadying device 40. However, the spherical bearing 145 is different from the conventional spherical bearing 45. In comparison, it differs only as described above. Therefore, a detailed description thereof will be omitted except for the points mentioned below. In addition, since there is no difference from the conventional large-sized containers such as hoppers and tanks equipped with the weight measuring system to which these are applied, the description of these is also omitted.

  As described above, the diameter of the spherical portion 143b of the shaft pin 143 which is a constituent element of the spherical bearing 145 is set to the same φ as the diameter of the support portions 143a at both ends, and in addition, the axial length of the spherical portion 143b is shortened, Since it is accommodated within the thickness of the bearing housing portion 150b of the bearing body 150, the gap between the members surrounding the spherical bearing portion (bearing body 150, shaft pin 143, upward support bracket 141) is minimized, Dust entering the spherical bearing is minimized. As understood from FIGS. 3 and 4, the upward support bracket 141 has a pair of standing plates facing each other with the bearing body 150 in between, and a lower portion thereof, which is spaced from each other and exceeds the width thereof. And an assembly with a partition plate extending horizontally.

  The spherical bearing 146 (second spherical bearing) has the same structure as the spherical bearing 145, and is arranged so that the free end side thereof faces the free end side of the spherical bearing 145. These two free ends are connected via a turnbuckle 147 (connecting member). In this way, the one-side spherical bearing 145 and the other-side spherical bearing 146 are connected to complete the steady rest device 140. The constituent members of the steady rest device 140 except for the spherical bearings 145 and 146 are all made of stainless steel in accordance with the stainless steel load cell 110.

  153 is a levitation regulation that regulates the upper pressure plate 121 fixed to the heavy object side such as the contents accommodated in the hopper or the like from the lower pressure plate 131 fixed to the gantry (base) side. This means is constituted by a combination of a plurality of bolts and nuts. Reference numerals 154 and 155 denote plate members that connect the upper pressure plate 121 and the lower pressure plate 131, but do not affect the weight measurement of the load cell 110.

Since the spherical bearing and the load cell steadying device including the spherical bearing of the present embodiment are configured as described above, the following effects can be obtained.
The spherical bearing 145 (the same applies to the spherical bearing 146, but in the following, the spherical bearing 145 will be described as a representative example) includes only two parts, a bearing body 150 and a shaft pin 143 having a spherical portion. Compared with the conventional spherical bearing 45, the ball as an independent part is omitted and the number of parts is reduced by one. Thereby, the spherical bearing 145 with a simple structure and a reduced size can be obtained.

  In addition, when the spherical bearing 145 having the same size is obtained as much as the spherical bearing 145 can be reduced in size, the bearing housing portion 150b formed by the straight hole 150c remaining in the bearing housing portion 150b of the bearing body 150 is left. The peripheral wall thickness t (see FIG. 2) can be made relatively large, and the cross-sectional area of the bearing body 150 can be made large, so that the spherical bearing 145 is made of an inexpensive stainless steel material with low strength. Even if it is made of stainless steel, it is possible to obtain a spherical bearing 145 that is small, inexpensive, and has a strength sufficient to handle a large load.

  Further, since the spherical bearing portion of the spherical bearing 145 is configured by a freely slidable combination of the straight hole 150c on the bearing body 150 side and the spherical portion 143b on the shaft pin 143 side, it slides on the spherical portion 143b. It is not necessary to form a spherical inner peripheral surface on the bearing body 150 side, and the processing of the spherical bearing portion including the processing of the spherical portion 143b becomes extremely easy. Specifically, both the straight hole 150c on the bearing body side 150 and the spherical surface portion 143b on the shaft pin 143 side can be processed only with an NC lathe and no heat treatment is required, so that no dedicated equipment is required. Even with a small amount, the spherical bearing 145 can be manufactured at low cost.

  In addition, since the diameter of the support portion 143a at both ends of the shaft pin 143 and the diameter of the spherical portion 143b at the center portion are the same (φ), a plurality of members (bearing body 150, shaft) surrounding the spherical bearing portion are provided. The gap between the pin 143 and the upward support bracket 141) can be minimized, dust entering the spherical bearing portion can be minimized, and the durability of the spherical bearing can be improved. Moreover, the maintenance becomes easy.

  Further, since the steadying device 140 of the load cell 110 includes the spherical bearing 145 described above, the deflection of the load cell 110 that can exhibit the various effects described above that the spherical bearing 145 exhibits. A stop device 140 can be provided.

  The invention of the present application is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

It is a plane sectional view of the spherical bearing of one example of the invention of this application. It is side surface sectional drawing of the spherical bearing. It is a front view of the steadying apparatus of the load cell provided with the spherical bearing. FIG. 4 is a plan sectional view taken along line XX in FIG. 3. It is a front view of the conventional hopper to which the weight measuring system using a load cell was applied. It is a top view of the hopper. It is a principal part enlarged view of the A section of FIG. It is a principal part top view of the A section. It is operation | movement explanatory drawing of the steadying apparatus of the load cell used for the same weight measurement system. It is a plane sectional view of the conventional spherical bearing. It is side surface sectional drawing of the spherical bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hopper, 10 ... Load cell, 20 ... Bracket, 30 ... Mounting stand (base), 110 ... Load cell, 121 ... Upper pressure plate, 131 ... Lower pressure plate, 140 ... Stabilizer, 141 ... Upward support bracket, 142 ... downward-facing support bracket, 143 ... shaft pin, 143a ... support part, 143b ... spherical part, 144 ... 145 ... spherical bearing (first spherical bearing), 146 ... spherical bearing (second spherical bearing), 147 ... turn Buckle, 148, 149 ... Loosening prevention nut, 150 ... Bearing body, 150a ... Mounting rod portion, 150b ... Bearing housing portion, 150c ... Straight hole, 151 ... Floating restriction means, 152, 153 ... Plate member, R ... Rod ( Rod-shaped body).

Claims (4)

A spherical bearing consists of a bearing body and a shaft pin,
The bearing body is composed of a bearing housing portion at a head portion and a mounting rod portion at a neck portion, and a straight hole is formed in the bearing housing portion,
The shaft pin is composed of a support part at both ends and a spherical part at the center part,
A spherical bearing, wherein the spherical portion is inserted into the straight hole so as to be freely slidable and the bearing body and the shaft pin are combined.   2. The spherical bearing according to claim 1, wherein the diameters of the support portions at both ends are the same as the diameter of the spherical portion at the center portion.   The spherical bearing according to claim 1 or 2, wherein the spherical bearing is made of stainless steel. The load cell steadying device used in the weighing system for heavy objects
A first spherical bearing rotatably connected to the base side via a first spherical bearing portion;
A second spherical bearing rotatably connected to the heavy object side via a second spherical bearing portion;
A connecting member that connects the free end side of the first spherical bearing and the free end side of the second spherical bearing;
4. The load cell steadying device according to claim 1, wherein the first spherical bearing and the second spherical bearing are the spherical bearings according to any one of claims 1 to 3.

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