JP3172023U - Display-holding static load inspection device for weighing machines - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably use a static load inspection device composed of a screw jack and a ratchet mechanism without pressing it with one hand, and to hold a display holding type for a weighing machine which enables accurate measurement to a minute value. Provided is a static load inspection device. SOLUTION: An elevating body support arm 3 is provided on a base 1 which is fixed to a structure and whose upper end is a shaft support portion, and a load setting shaft 4 is rotatably screwed in a vertical state. The elevating body 9 is slidably and non-rotatably inserted into the elevating body support arm 3. An inspection load cell 10 having an upper eyebolt on the upper end side and electrically connected to the digital indicator is connected to the upper end side of the elevating body 9. A ratchet mechanism 11 for raising and lowering the elevating body to apply a static load to the inspection load cell is provided on the load setting shaft 4. The ratchet lever of the ratchet mechanism 11 is provided with an interlocking mechanism 12 that locks to the load setting shaft 4. [Selection diagram] Fig. 1

Description

The present invention relates to a display-holding static load inspection device for a weighing machine for inspecting the accuracy of a weighing machine that weighs a mixture of water, cement, sand, gravel, crushed stone, or various raw materials in a ready-mixed concrete production plant.

  For example, a measuring machine incorporated in a ready-mixed concrete manufacturing plant, a so-called batcher plant, is required to inspect its accuracy twice a year by law. For this reason, conventionally, a weight shelf is assembled to the weighing hopper at each inspection, a reference weight of a predetermined weight is loaded on the shelf until a predetermined static load is reached, and the static load applied to the weighing load cell is displayed on the indicator. By displaying, the accuracy of the weighing load cell is inspected. However, loading and unloading of weights is inefficient and has a drawback that the burden on the operator is large.

  Therefore, in order to improve the efficiency of the weighing work, a simple static load inspection device incorporating a screw jack and a ratchet mechanism has come to be used. This simple static load inspection device has a hook for locking to a structure at the lower end, a ratchet mechanism connected to the upper end of the hook, a screw jack connected to the upper end of the ratchet mechanism, and an upper end of the screw jack. It is generally constituted by a rotation prevention lever provided and an inspection load cell connected between the upper end of the screw jack and the weighing hopper.

  When measuring with the above inspection device, the hook is locked to the floor of the structure, the inspection load cell is connected to the weighing hopper, the ratchet mechanism is operated to reduce the screw jack, and the load is applied to the inspection load cell to a predetermined value. By multiplying the numerical value of the inspection load cell with the numerical value of the weighing load cell of the weighing hopper, an error in the numerical value of the weighing load cell is detected.

JP-A-2-32220

  In the static load inspection device incorporating the screw jack and the ratchet mechanism described above, the ratchet mechanism moves to the pawl wheel for each pawl, that is, every click. There is a disadvantage in terms of accuracy that a width occurs and the numerical value between these widths cannot be measured, that is, analog measurement cannot be performed. In addition, since the ratchet mechanism is connected to the structure by a hook, the ratchet mechanism rotates together when the ratchet lever is pushed, so that the ratchet mechanism must be held by the other hand and has a disadvantage that workability is poor.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and can stably use a static load inspection device constituted by a screw jack and a ratchet mechanism without being pressed with one hand, It is an object of the present invention to provide a display holding type static load inspection device for a weighing machine that enables accurate measurement.

The present invention configured to solve the above-described problem is that the lower end is a connection fixing part to the structure, the upper end is a base supporting part as a shaft supporting part, the lifting body supporting arm provided on the base, and the upper part from the middle in the axial direction. A load setting shaft having a male screw portion on the side, and a lower end side rotatably supported by the shaft support portion of the base body in a vertical state, and supported slidably and non-rotatably on the lifting body support arm, Elevating body having a female threaded part that engages with the male threaded part of the load setting shaft, and having a weighing machine connecting part on the upper end side, the lower end side being connected to the upper end side of the elevating body and electrically connected to the digital indicator An inspection load cell, a ratchet mechanism provided on the load setting shaft to raise and lower the lifting body to apply a static load to the inspection load cell, and a ratchet lever of the ratchet mechanism is locked to the load setting shaft An interlocking mechanism, the interlocking machine Is provided on the load setting shaft and has a ratchet engagement ring in which a plurality of engagement portions are formed on the outer peripheral surface at equal intervals, and a engagement portion provided on the ratchet lever and selectively engaging / disengaging with the engagement portion. And a mechanism main body having a mating pin that can be advanced and retracted.

  And the said raising / lowering body support arm is good to provide in the said base | substrate so that raising / lowering is possible.

  Further, the mechanism body has the engaging pin inserted in a holder provided on the ratchet lever so as to be able to advance and retract, and the engaging pin is directed toward the ratchet locking ring by a spring stretched between the holder and the holder. It is preferable that the stopper is provided on the engaging pin and locked to the holder so that the stopper can be held in the retracted state against the spring force of the spring.

Since the present invention is configured as described above, the following effects can be obtained.
(1) Pushing the ratchet lever to bring the test load cell to a value close to the measured weight of the weighing hopper, and then connecting the ratchet lever to the load setting shaft by an interlocking mechanism enables the load setting shaft to be rotated. Therefore, fine measurement is possible regardless of the pitch of the ratchet wheel, which is a drawback of the ratchet mechanism, and the measurement value can be arbitrarily set and held.
(2) Since the base that supports the ratchet mechanism is fixed to the structure with the mounting bolt, it is not necessary to suppress the other components from rotating together with the other hand as in the prior art when operating the ratchet mechanism. So workability is excellent.
(3) Since the lifting / lowering body support arm is provided on the base body so as to be movable up and down, it is possible to widen the vertical movable width of the lifting body, so that it can correspond to a plurality of weighing hoppers having different heights for connecting the load cells for inspection. .
(4) The mechanism main body constituting the interlocking mechanism is urged toward the ratchet locking ring by a spring stretched between the holder that supports the engagement pin so as to be able to advance and retreat, and the stopper is locked to the holder. As a result, the spring can be held in the retracted state against the spring force of the spring, so that the operation of engaging the engagement pin with the ratchet engagement ring can be performed reliably and promptly.

It is a front view of the display holding | maintenance type static load inspection apparatus for weighing machines which concerns on embodiment of this invention. It is a right view which breaks and shows a part of the apparatus. It is AA arrow direction sectional drawing in FIG. It is a top view which shows the internal structure of an interlocking mechanism. It is a longitudinal cross-sectional view which shows the internal structure of an interlocking mechanism. It is explanatory drawing of the state which assembled | attached the load inspection apparatus which concerns on embodiment to a batcher plant.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, reference numeral 1 denotes a metal substrate. The base body 1 is made of a substantially rectangular plate, and includes a bottom plate 1A on which mounting bolts 2 for fixing to the floor of the building are inserted, side plates 1B and 1B standing from two sides of the bottom plate 1A, and a thick wall. The front side is opened from a rear plate 1C, a shaft support plate 1D provided at the upper end of the side plate 1B and the rear plate 1C, and a shaft insertion hole 1E formed in the shaft support plate 1E and through which a load setting shaft 4 described later is inserted. A support column 1F is formed to protrude upward from the rear plate 1C.

  3 is an elevating body support arm which is provided on the support column 1E and supports the elevating body 9 which will be described later so as to be slidable in the vertical direction and non-rotatable. The elevating body support arm 3 is slidably inserted into the support column 1F. A fitting boss 3A, an arm main body 3B projecting laterally from the boss 3A, a support hole 3C formed of a square hole formed in the arm main body 3B, and a screw for engaging with the boss 3A for fixing to the support column 1F It consists of a set screw 3D.

  Reference numeral 4 denotes a load setting shaft that is screwed into the base 1 in a vertical state. The load setting shaft 4 is formed on the shaft main body 4A, the upper male screw portion 4B formed on the upper side of the shaft main body 4A, and on the lower end side. The lower male screw portion 4C and a ratchet fitting portion 4D chamfered on six surfaces fitted in the middle of the shaft main body 4A. The load setting shaft 4 is axially supported by inserting the lower end side of the load setting shaft 4 into the shaft support plate 1E of the base 1 through the sleeve 5 and the washer 6 and fastening the bearing holder 7 having a thrust ball bearing with the nuts 8 and 8. The plate 1E is rotatably supported.

  Reference numeral 9 denotes an elevating body inserted through the elevating body support arm 3 so as to be slidable in the vertical direction. The elevating body 9 is a U-shaped cylindrical body in a plan view, and has connecting portions 9A and 9A formed in a bifurcated shape on the upper end side, and a female screw that is screwed to the upper male screw portion 4B of the load setting shaft 4 on the lower end side. A nut to be a part 9B is fitted. And the raising / lowering body 9 which consists of the above-mentioned structure is supported by the raising / lowering body support arm 3 in the state which screwed the load setting axis | shaft 4 to the internal thread part 9B, and when the load setting axis | shaft 4 rotates, arrow I Go up and down.

  Reference numeral 10 denotes an inspection load cell for detecting a tensile load. The inspection load cell 10 protrudes from a known load cell main body 10A and a lower end of the load cell main body 10A, and is connected to a connecting portion 9A of the lifting body 9. The lower eyebolt 10B and the upper eyebolt 10C provided at the upper end of the load cell main body 101A and connected to the weighing hopper ○ are connected to the weighing cell main body 10A. The load cell main body 10A is a digital having a summing function via a signal line 10D. Connected to an indicator.

  Reference numeral 11 denotes a ratchet mechanism that is fitted to the ratchet fitting portion 4 </ b> D of the load setting shaft 4 in order to apply a static load to the inspection load cell 10. The ratchet mechanism 11 includes a mechanism portion 11A in which a pawl is detachably engaged with a pawl wheel that rotates integrally with the load setting shaft 4, a ratchet lever 11B for rotating the mechanism portion 11A, and the direction of the pawl. In other words, it has a known configuration including a changeover switch 11C that switches the operation direction of the ratchet lever 11B. The ratchet lever 11B is pushed in the direction indicated by the arrow C, thereby rotating the load setting shaft 4 in a predetermined direction to lower the elevating body 9 and returning to the free direction in the opposite direction to the arrow D direction.

  Reference numeral 12 denotes an interlocking mechanism for locking the ratchet lever 11B of the ratchet mechanism 11 to the load setting shaft 4. Reference numeral 13 denotes a ratchet locking ring constituting the interlocking mechanism 12. The ratchet locking ring 13 has a plurality of, in the embodiment, twelve locking recesses 13A, 13A formed at equal intervals on the outer peripheral surface of the ring body. It is made up of. Reference numeral 14 denotes a mechanism main body provided on the ratchet lever 11B. The mechanism main body 14 is inserted into the substantially cylindrical holder 14A facing the ratchet locking ring 13 so as to be able to advance and retreat, and the tip thereof is locked in the locking mechanism. An engagement pin 14B that fits into the recess 13A, an engagement protrusion 14C that protrudes radially on the rear end side of the engagement pin 14B, an operation knob 14D that is provided on the rear end of the engagement pin 14B, A compression spring 14E that is stretched between the coupling pin 14B and the holder 14A and biases the engagement pin 14B in the protruding direction, and an engagement pin 14B that is retracted against the spring force of the compression spring 14E. In order to stop, it is comprised from the locking groove 14F provided in the rear surface of the holder 14A.

  Next, the case where the load inspection apparatus of the present embodiment having the above-described configuration is inspected using a weighing machine of a batcher plant will be described as an example, and the operation will be described with reference to FIG. In the figure, 21 is a fixed transverse beam of the building, 22, 22, 22 are three weighing load cells suspended from the fixed transverse beam 21, and each weighing load cell 22 is installed in an operation room (not shown) 23. And are electrically connected. Reference numeral 24 denotes a weighing hopper suspended from the weighing load cells 22, 22, 22. A pair of brackets 24 A, 24 A project from the upper end side of the weighing hopper 24, and a connection shackle 24 B is provided on each bracket 24 A. A reference numeral 25 is a deck provided around the weighing hopper 24 and provided in the building.

  When performing an accuracy inspection of the weighing load cells 22, 22, 22, at least two inspection devices are used as shown in the figure, so that the right inspection device is referred to as the No. 1 device and the left device is referred to as the No. 2 device. . Since the No. 1 device is the invention of Patent No. 2042318 obtained by the applicant, details are omitted. First, the upper eyebolt 10 </ b> C of the inspection load cell 10 is coupled to the connection shackle 24 </ b> B of the weighing hopper 24, and the base 1 is fixed to the deck 25 by the mounting bolt 2. Next, the interlocking mechanism 12 is set in a free state, the ratchet lever 11B is pushed in the direction indicated by the arrow, and the load setting shaft 4 is rotated so as to be roughly fed. Thereby, the raising / lowering body 9 falls. In this way, the No. 1 device and the No. 2 device are stretched between the weighing hopper 24 and the deck 25, and the load is applied to the inspection load cell 10 so that the value is close to the measured weight of the weighing hopper 24. .

  Thereafter, the engaging pin 12B of the interlocking mechanism 12 is advanced by the spring force of the compression spring 14D, and the tip side thereof is fitted and pressed into the locking recess 13A of the ratchet locking ring 13. As a result, the movement of the ratchet lever 11B in the rotational direction can be directly transmitted to the ratchet locking ring 13, and the load setting shaft 4 is rotated by slightly rotating the ratchet lever 11B in the direction indicated by arrow D. The weighing load cell 10 can be set to an accurate measurement value by raising or lowering the lifting body 9 by a minute amount.

  In this way, the interlocking mechanism 12 is initially in a free state, and when the load applied to the inspection load cell 10 is finely adjusted, the interlocking mechanism 12 allows the ratchet lever 11B and the load setting shaft 4 to rotate integrally. Highly accurate measurement is possible without being affected by the pitch of the ratchet mechanism 11.

  In the above operation, the engagement pin 14B is urged toward the ratchet locking ring 13 by the compression spring 14E stretched between the holder 14A and the engagement protrusion 14C provided on the engagement pin 14B is moved to the holder 14A. Since it is configured so that it can be held in the retracted state against the spring force of the compression spring 14E by engaging with the spring, the operation of engaging the engagement pin 14B with the ratchet engagement ring 13 by the spring force of the compression spring 14E is quickly performed. Can be done.

  In the present embodiment, the lifting body support arm 3 is provided on the base 1 so as to be lifted and lowered, so that the lifting width of the lifting body 9 can be increased. Can correspond to a hopper.

DESCRIPTION OF SYMBOLS 1 Base | substrate 3 Lifting body support arm 4 Load setting axis | shaft 4B Male thread part 9 Lifting body 9B Female thread part 10 Inspection load cell 10C Upper eyebolt (metering machine connection part)
DESCRIPTION OF SYMBOLS 11 Ratchet mechanism 11B Ratchet lever 12 Interlocking mechanism 13 Ratchet locking ring 13A Engagement recessed part 14 Mechanism main body 14A Holder 14B Engagement pin 14C Engagement protrusion (stopper)
14E compression spring

Claims (3)

  The lower end is a connection fixing part to the structure, the upper end is a base that serves as a shaft support part, a lifting body support arm provided on the base, a male screw part on the upper side from the middle in the axial direction, and the lower end side is the shaft of the base A load setting shaft that is rotatably supported by the support portion in a vertical state; and a female screw portion that is slidably and non-rotatably supported by the lifting / lowering body support arm and is screwed into the male screw portion of the load setting shaft. The lifting body has a weighing machine connecting portion on the upper end side, and the lower end side is connected to the upper end side of the lifting body, and is electrically connected to the digital indicator, and the lifting body is moved up and down. The ratchet mechanism provided on the load setting shaft for applying a static load to the load cell for inspection, and an interlocking mechanism for locking the ratchet lever of the ratchet mechanism to the load setting shaft, the interlocking mechanism comprising the load setting shaft Provided on the outer peripheral surface. A ratchet engagement ring having portions formed at equal intervals, and a mechanism body provided on the ratchet lever and having a mechanism main body that can be engaged and disengaged selectively with respect to the engagement portion. Display-holding static load inspection device for machines.   The display holding type static load inspection apparatus for a weighing machine according to claim 1, wherein the elevating body support arm is provided so as to be movable up and down on the base. The mechanism body is inserted into a holder provided on the ratchet lever so that the engagement pin can be moved forward and backward, and the engagement pin is attached to the ratchet locking ring by a spring stretched between the holder and the holder. 2. The structure according to claim 1, wherein the stopper is provided on the engaging pin so as to be held in a retracted state against the spring force of the spring by engaging the stopper with the holder. Display-holding static load inspection device for weighing machines.

Images