JP4864417B2 - Combination scale - Google Patents

Description

  The present invention relates to a combination weigher that puts a weighed object into a packaging machine or the like.

  Conventionally, as a combination weigher connected to two packaging machines or a twin type packaging machine, for example, there is a structure as shown in FIG. 9 (see Patent Document 1).

  FIG. 9A is a schematic schematic view of a partial cross section of a conventional combination weigher viewed from the side, and FIG. 9B is an assembly chute (inner chute and two outer chutes) of the same combination weigher. FIG. 9C is a schematic diagram of the two lower chutes, the intermediate hopper, and the discharge hopper of the combination weigher viewed from above.

  In this combination weigher, a conical dispersion feeder 1 is provided above the center substrate 5 to disperse the object to be weighed supplied from an external supply device radially by vibration. A plurality of linear feeders 2 are provided for feeding an object to be weighed sent from 1 to each supply hopper 3 by vibration. Below each linear feeder 2, a supply hopper 3 and a weighing hopper 4 are provided correspondingly, and the plurality of supply hoppers 3 and the weighing hoppers 4 are arranged in a circle around the center base 5. Each weighing hopper 4 is provided with a weight sensor 41 for measuring the weight of the object to be weighed in the weighing hopper 4. An inner chute 6a and two outer chutes 6b and 6c are disposed below the weighing hoppers 4 arranged in a circle. Each weighing hopper 4 is configured to selectively discharge the object to be measured to the inner chute 6a and the outer chute 6b or 6c below the weighing hopper 4. Intermediate hoppers 7a, 7b, 7c are disposed at the lower discharge ports of the inner chute 6a and the outer chutes 6b, 6c, respectively, and two discharge hoppers (8aL) are provided below the intermediate hoppers 7a, 7b, 7c. , 8aR), (8bL, 8bR), (8cL, 8cR). The intermediate hoppers 7a, 7b, and 7c are configured such that the objects to be weighed can be selectively discharged to the two lower discharge hoppers. A lower chute 9L is disposed below the discharge hoppers 8aL, 8bL, 8cL, and a lower chute 9R is disposed below the discharge hoppers 8aR, 8bR, 8cR. Under this combination weigher, for example, two wrapping machines or twin type wrapping machines are arranged, and the objects to be weighed discharged from the discharge ports 9La and 9Ra of the lower chutes 9L and 9R are respectively input to the packaging machine. It is thrown into the mouth.

The control unit 30 controls the operation of the entire combination weigher and performs combination processing. In the combination processing, combination calculation is performed based on the measurement value (measurement value by the weight sensor 41) of the group B weighing hopper 4 arranged above the one outer chute 6b, and the total of the measurement values of the measurement hopper 4 is the target. An optimum combination weighing hopper 4 that is within the allowable range for the weight value and that is closest to the target weight value (referred to as the combination hopper 4B) is selected, and the group C disposed above the other outer chute 6c is selected. A combination calculation is performed based on the measurement value of the weighing hopper 4, and the optimum combination weighing hopper 4 (referred to as a combination hopper 4C) is selected in the same manner. Then, out of the group A consisting of all the weighing hoppers 4, in the groups B and C, the combination calculation is performed based on the weighing values of the weighing hoppers 4 that are not selected as the optimum combination, and the weighing hoppers 4 ( This is designated as combination hopper 4A). The objects to be weighed are discharged simultaneously from the combination hoppers 4A, 4B, 4C selected by the above combination processing. The objects to be weighed in the group A combination hopper 4A are discharged to the inner chute 6a and temporarily held by the intermediate hopper 7a. The objects to be weighed in the group B combination hopper 4B are discharged to the outer chute 6b and temporarily held by the intermediate hopper 7b. Then, the objects to be weighed in the combination hopper 4C of group C are discharged to the outer chute 6c and temporarily held by the intermediate hopper 7c. Thereafter, the objects to be weighed are transferred from the three intermediate hoppers 7a, 7b, 7c to one discharge hopper 8aL, 8bL, 8cL at the same time. Similarly, the objects to be weighed held in the three intermediate hoppers 7a, 7b and 7c in the next weighing cycle are simultaneously transferred to the other discharge hoppers 8aR, 8bR and 8cR. Then, the discharge hoppers 8aL, 8bL, 8cL on the lower chute 9L side and the discharge hoppers 8aR, 8bR, 8cR on the lower chute 9R side perform the discharge operation alternately, so that each discharge is performed three times in two weighing cycles. The objects to be weighed are discharged from the outlets 9La and 9Ra.
Japanese Patent Publication No.8-1395

  According to the above-described conventional configuration, the object to be weighed can be discharged three times each from the discharge ports 9La and 9Ra in two weighing cycles, but the inner chute 6a and the outer chute can be operated. A total of nine hoppers including three intermediate hoppers 7a, 7b, 7c and six discharge hoppers 8aR, 8bR, 8cR, 8aL, 8bL, 8cL are required between the chutes 6b, 6c and the lower chutes 9L, 9R. There were many parts and the structure was complicated. In the conventional configuration, the discharge hoppers 8aR, 8bR, 8cR, 8aL, 8bL, and 8cL are eliminated, and the objects to be weighed from the intermediate hoppers 7a, 7b, and 7c are distributed to the two lower chutes 9L and 9R for discharge. However, in this case, the high-speed discharge operation as described above cannot be performed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a combination weigher that can perform a high-speed discharging operation and can simplify the structure by reducing the number of parts.

In order to solve the above-mentioned problems, the combination weigher of the present invention is arranged in a ring, weighs the objects to be supplied, and selectively selects the objects to be weighed in two directions inside and outside the ring. A plurality of weighing hoppers to be discharged, an inner chute that is disposed below the weighing hopper, collects objects to be discharged inward from the weighing hopper, and discharges them from a lower discharge port, and the inner chute First and second outer chutes, which are disposed around the hopper and collect the objects to be weighed discharged from the weighing hopper in the outer direction and discharge from the lower discharge port, the inner chute, and the first outer chute First and second intermediate hoppers that are provided at the discharge port of any two chutes of the chute and the second outer chute, and temporarily hold and discharge the objects to be discharged from the discharge port; The first First and second discharge hoppers that temporarily hold and discharge the objects to be discharged from the second intermediate hopper, the inner chute, the first outer chute, and the second outer chute. Of these, a third discharge hopper that is provided at the discharge port of the chute where the first and second intermediate hoppers are not provided at the discharge port, and temporarily holds and discharges the objects to be discharged from the discharge port. And first and second lower chutes disposed below the first, second, and third discharge hoppers and having discharge ports, respectively, and the objects to be weighed at different timings from the respective discharge hoppers. Control means for controlling the first, second and third discharge hoppers so that the objects to be weighed are sequentially discharged and the objects to be sequentially discharged are alternately discharged to the first and second lower chutes. wherein the The total number of hoppers provided between the side chute, the first outer chute and the second outer chute, and the first and second lower chutes is five. Consists of the first and second intermediate hoppers and the first, second and third discharge hoppers.

  In the present invention, the annular shape, which is an arrangement shape of the weighing hoppers, is a shape including a polygonal shape such as a circular shape, an elliptical shape, a rectangular shape, or a rectangular shape. Further, in the configuration in which the weighing hoppers are arranged in a rectangular shape, a configuration in which the weighing hoppers are arranged in two lines in a straight line without the weighing hoppers being arranged in the two short side portions of the rectangle is also possible. Are included in the configuration in which the weighing hoppers in FIG.

  According to the configuration of the present invention, two intermediate hoppers and three discharge hoppers are provided, and the objects to be weighed sequentially from the three discharge hoppers are discharged alternately to the first and second lower chutes. As a result, the object to be weighed can be discharged three times from the respective outlets of the two lower chutes in two weighing cycles, and such a high-speed discharging operation is possible. A total of five hoppers including two intermediate hoppers and three discharge hoppers may be used between the first and second outer chutes and the first and second lower chutes. The number of used hoppers can be reduced and the structure can be simplified.

  The first, second and third discharge hoppers are arranged in a straight line, and the first and second lower chutes are arranged in a direction perpendicular to the arrangement direction of the discharge hoppers, Each of the first, second, and third discharge hoppers may be configured to selectively discharge an object to be measured to the first lower chute and the second lower chute.

  The first, second and third discharge hoppers are arranged in a straight line, and the first and second lower chutes are arranged in the same direction as the arrangement direction of the discharge hoppers. The discharge hopper arranged at the center of the first, second and third discharge hoppers can selectively discharge the object to be measured to the first lower chute and the second lower chute. The discharge hopper disposed above the first lower chute other than the discharge hopper disposed at the center discharges the object to be weighed to the first lower chute, and the second lower chute The discharge hopper disposed above may be configured to discharge the object to be weighed to the second lower chute.

  With this configuration, each of the two discharge hoppers at both ends of the three discharge hoppers only needs to discharge the object to be measured with respect to one lower chute, so there is no need to discharge in two directions. Can be easy. Further, the two lower chutes need only be arranged to receive the objects to be weighed discharged from the two discharge hoppers, respectively, compared with the case of receiving the objects to be weighed discharged from the three discharge hoppers. Thus, the opening area of the upper part of each lower chute can be reduced.

  The first intermediate hopper may be provided at a discharge port of the first outer chute, and the second intermediate hopper may be provided at a discharge port of the second outer chute.

  With this configuration, the balance of structural balance and weight of the combination weigher itself is improved.

  The present invention has an effect of having the configuration described above and capable of providing a combination weigher that can perform a high-speed discharge operation and can simplify the structure by reducing the number of parts.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 (a) is a schematic schematic view of a partial cross section of the combination weigher according to Embodiment 1 of the present invention viewed from the side, and FIG. 1 (b) is an assembly chute (inner chute and inner chute) of the combination weigher. FIG. 1C is a schematic view of the two lower chutes and the discharge hopper of the combination weigher as viewed from above.

  In this combination weigher, as shown in FIG. 1 (a), a center base body (body) 5 is supported at the center of the apparatus by, for example, four legs (not shown), and an upper portion is provided with an external supply. A conical dispersion feeder 1 that disperses the object to be weighed supplied from the apparatus radially by vibration is provided. Around the dispersion feeder 1, a plurality of linear feeders 2 are provided for feeding an object to be weighed sent from the dispersion feeder 1 to each supply hopper 3 by vibration. Below each linear feeder 2, a supply hopper 3 and a weighing hopper 4 are provided correspondingly, and the plurality of supply hoppers 3 and the weighing hoppers 4 are arranged in a circle around the center base 5. The dispersion feeder 1, the linear feeder 2, the supply hopper 3, and the weighing hopper 4 are attached to the center base 5, and the drive unit (the vibration device of the dispersion feeder 1 and the linear feeder 2, the supply hopper 3, and the like) A gate opening / closing device of the weighing hopper 4) is accommodated. Each weighing hopper 4 is attached with a weight sensor 41 such as a load cell for measuring the weight of an object to be weighed in the weighing hopper 4. The measurement value by each weight sensor 41 is output to the control unit 20.

  A substantially inverted frustoconical inner chute 6a is disposed below the weighing hoppers 4 arranged in a circle, and the upper opening is concentric around the inner chute 6a and is divided into two outer parts. Chute 6b, 6c is provided. Each weighing hopper 4 has a configuration in which a gate (not shown) is provided so that an object to be weighed can be selectively discharged to the inner chute 6a and the outer chute 6b or 6c below. The groups B and C of the weighing hoppers 4 arranged above the outer chutes 6b and 6c are groups corresponding to the outer chutes 6b and 6c, respectively, and for example, from 9 or 10 weighing hoppers 4 respectively. It is a group. Intermediate hoppers 7b and 7c are disposed at lower discharge ports of the outer chutes 6b and 6c, respectively, and discharge hoppers 8b and 8c are disposed below the intermediate hoppers 7b and 7c. The group A composed of the weighing hoppers 4 of the group B and the group C is a group of the weighing hoppers 4 corresponding to the inner chute 6a. A discharge hopper 8a is disposed at the lower discharge port 6ae of the inner chute 6a. As shown in FIG. 1 (c), two lower chutes 9L and 9R are disposed below the discharge hoppers 8a, 8b and 8c, and each of the discharge hoppers 8a, 8b and 8c has two lower chutes 9L. , 9R is provided with a gate (not shown) so that the object to be weighed can be selectively discharged. The objects to be weighed discharged to the lower chutes 9L and 9R are discharged from the respective discharge ports 9La and 9Ra.

  Below the lower chutes 9L and 9R of this combination weigher, two unillustrated wrapping machines or a twin-type wrapping machine having two input ports for an object to be weighed are arranged, and the discharge port 9La of the lower chute 9L. And the objects to be weighed discharged from the discharge ports 9Ra of the lower chute 9R are respectively input to the input ports of the packaging machine, and are packed while being packed by the packaging machine.

  The control unit 20 controls the operation of the entire combination weigher and performs combination processing described later to determine the combination of the weighing hoppers 4 to which the objects to be weighed are to be discharged.

  The operation of the combination weigher configured as described above will be described.

  The objects to be weighed supplied from the external supply device to the dispersion feeder 1 are supplied from the dispersion feeder 1 to each supply hopper 3 via each linear feeder 2, and the objects to be weighed are input from each supply hopper 3 to each weighing hopper 4. Is done. A combination process or a combination hopper discharge process, which will be described later, is performed, and an object to be weighed is fed from the supply hopper 3 to the empty weighing hopper 4. Similarly, an object to be weighed is supplied from the linear feeder 2 to the empty supply hopper 3.

  When an object to be weighed is put into the weighing hopper 4 and measurement by the weight sensor 41 is performed, the control unit 20 performs combination processing based on the measurement value of the measurement hopper 4 (measurement value by the weight sensor 41). In this combination processing, a combination weighing hopper 4 that discharges an object to be weighed from the group A weighing hoppers 4 to the inner chute 6a (referred to as a combination hopper 4A) is obtained. A combination weighing hopper 4 that discharges the objects to be weighed from the group C weighing hoppers 4c to the outer chute 6c is obtained. 4 (this is referred to as a combination hopper 4C). Here, the combination hoppers 4A, 4B, and 4C are obtained so that the same weighing hopper 4 is not selected as the combination hopper 4A and the combination hoppers 4B and 4C. For example, in the combination processing, combination calculation is performed based on the measurement value of the weighing hopper 4 of the group B arranged above the one outer chute 6b, and the total of the measurement values of the measurement hopper 4 is within an allowable range with respect to the target weight value. And the optimum combination weighing hopper 4 (combination hopper 4B) closest to the target weight value is selected and combined based on the weighing value of the group C weighing hopper 4 arranged above the other outer chute 6c. The calculation is performed and the optimum combination weighing hopper 4 (combination hopper 4C) is selected in the same manner. Then, out of the group A consisting of all the weighing hoppers 4, in the groups B and C, the combination calculation is performed based on the weighing values of the weighing hoppers 4 that are not selected as the optimum combination, and the weighing hoppers 4 ( The combination hopper 4A) is selected. Then, the control unit 20 simultaneously discharges the objects to be weighed from the combination hoppers 4A, 4B, and 4C selected in the combination process (combination hopper discharge process).

  FIG. 2 is a timing chart showing an example of the gate opening / closing operation of each of the weighing hopper 4 (combination hoppers 4A, 4B, 4C), intermediate hoppers 7b, 7c, and discharge hoppers 8a, 8b, 8c of the combination weigher of the present embodiment. It is a chart. This timing chart is shown using the following conditions. Assuming that the gate opening time ta of the weighing hopper 4 is 150 ms, the stability and combination time tb is 700 ms, the weighing cycle T is 850 ms. The stability and combination time tb is the stabilization time of the weight sensor 41 attached to the weighing hopper 4 after the weighing hopper 4 is closed and the weighing object is supplied from the supply hopper 3 to the weighing hopper 4. Is the time required for the weight of the object to be measured to pass and the combination process to be completed. Further, the gate opening time t1 of the intermediate hoppers 7b and 7c and the gate opening time t2 of the discharge hoppers 8a, 8b and 8c are 200 ms, respectively. Further, it is assumed that the time from the opening of the weighing hopper 4 gate to the discharge hopper 8a or the intermediate hoppers 7b and 7c reaching the discharge hopper 8a or the intermediate hoppers 7b and 7c is 400 ms. It is assumed that the time from when the gate is closed until the end of the object to be weighed reaches the discharge hopper 8a or the intermediate hoppers 7b and 7c is 700 ms corresponding to the stability and combination time tb. Further, it is assumed that the time from when the gates of the intermediate hoppers 7b and 7c are opened until the top of the objects to be discharged discharged from the intermediate hoppers 7b and 7c reaches the discharge hoppers 8b and 8c is 200 ms. It is assumed that the time t3 from when the gates of the intermediate hoppers 7b and 7c are closed until all the objects to be weighed discharged from the intermediate hoppers 7b and 7c reach the discharge hoppers 8b and 8c is 200 ms. A broken line extending from the start time of the gate opening operation of each upper hopper (4A, 4B, 4C, 7b, 7c) to a line indicating the operation timing of the lower hopper (7b, 7c, 8a, 8b, 8c). Indicates the time when the top of the object to be weighed discharged from the upper hopper reaches the lower hopper, and from the end time of the opening operation of each upper hopper to the line indicating the operation timing of the lower hopper The extending broken line indicates the time when the last of the objects to be weighed discharged from the upper hopper reaches the lower hopper. For example, the objects to be weighed discharged from the combination hoppers (4A, 4B, 4C) during the time 0.0 to 0.15 (sec) start at the lower hoppers (8a, 7b, 7c). A broken line indicates that the arrival time is 0.4 (sec) and the last time is 0.85 (sec).

  As shown in FIG. 2, the objects to be weighed discharged simultaneously from the combination hoppers 4A, 4B, and 4C are collected and temporarily held in the discharge hopper 8a and intermediate hoppers 7b and 7c, respectively. The objects to be weighed collected in the intermediate hoppers 7b and 7c are simultaneously transferred to the discharge hoppers 8b and 8c and temporarily held. The objects to be weighed transferred to the respective discharge hoppers 8a, 8b, 8c in this way are discharged from the respective discharge hoppers 8a, 8b, 8c at different timings, and the two lower chutes 9L, 9R. Alternately discharged. The discharge hoppers 8a, 8b, 8c whose gates are opened at times TR1 to TR6 open the gates for discharging the objects to be measured to the lower chute 9R side, and the discharge hoppers whose gates are opened at times TL1 to TL6. 8a, 8b, and 8c open the gate for discharging the object to be weighed to the lower chute 9L side. Each of the discharge hoppers 8a, 8b, and 8c performs a discharge operation so as to discharge the object to be measured alternately to the lower chute 9R and the lower chute 9L. The discharge operation cycles of the discharge hoppers 8a, 8b, and 8c are equal to the weighing cycle T and are shifted by a time of T / 3. By operating as described above, it is possible to discharge to the two lower chutes 9L and 9R three times each in two weighing cycles (2 × T).

  In FIG. 2, in the discharge hopper 8a that does not have an intermediate hopper on the upper side, the gate is opened to discharge the object to be weighed during the time when the object to be discharged from the combination hopper 4A does not reach. . Here, if the intermediate hoppers 7b and 7c are not provided, the objects to be weighed are supplied to the discharge hoppers 8b and 8c in addition to the discharge hopper 8a for a time of 0.4 to 0.85 (sec), for example. During this period, the gates of the discharge hoppers 8a, 8b, and 8c cannot be opened, so that a high-speed discharge operation cannot be performed as described above. Accordingly, the intermediate hoppers 7b and 7c are necessary for performing a high-speed discharge operation.

  In the first embodiment, the object to be weighed is discharged three times each from the discharge ports 9La and 9Ra in two weighing cycles, and a high-speed discharging operation is possible, and the inner chute 6a and the outer chute are discharged. A total of five hoppers including two intermediate hoppers 7b, 7c and three discharge hoppers 8a, 8b, 8c may be used between 6b, 6c and lower chutes 9L, 9R. The number of used hoppers can be reduced and the structure can be simplified.

(Embodiment 2)
FIG. 3 (a) is a schematic schematic view of a partial cross section of the combination weigher according to the second embodiment of the present invention viewed from the side, and FIG. 3 (b) is an assembly chute (inner chute and FIG. 3C is a schematic schematic view of the two lower chutes and the discharge hopper of the combination weigher as viewed from above.

  The combination weigher of the second embodiment is different from the first embodiment in the discharge configuration of the discharge hoppers 8a, 8b, 8c and the arrangement of the lower chutes 9L, 9R, and the discharge hoppers 8a, 8b, 8c and the lower chutes. Since the configuration other than 9L and 9R is the same as that of the first embodiment, the description thereof is omitted.

  In the second embodiment, a lower chute 9L is disposed corresponding to the discharge hoppers 8a and 8b, and a lower chute 9R is disposed corresponding to the discharge hoppers 8a and 8c. Here, the discharge hopper 8a has a configuration in which a gate (not shown) is provided so that the object to be weighed can be selectively discharged to the two lower chutes 9L and 9R. In addition, the weighing object discharged from the discharge hopper 8b is discharged only to the lower chute 9L, and the weighing object discharged from the discharge hopper 8c is discharged only to the lower chute 9R. As in the first embodiment, two unillustrated packaging machines or twin type packaging machines are arranged below the lower chutes 9L, 9R, and the discharge ports 9La, 9Ra of the lower chutes 9L, 9R, respectively. Each item to be weighed is packed in a bag.

  The control unit 20 performs a combination process similar to that of the first embodiment on the basis of the measured value of the weighing hopper 4 (measured value by the weight sensor 41) and controls the operation of the entire combination weigher.

  The operation of the combination weigher configured as described above will be described.

  As in the case of the first embodiment, an object to be weighed is put into the weighing hopper 4 and measurement by the weight sensor 41 is performed. The control unit 20 performs combination processing in the same manner as in the first embodiment on the basis of the measurement value of the weighing hopper 4 (measured value by the weight sensor 41), and the weighing hopper 4 (combination hoppers 4A, 4B, 4C) to be discharged. ) Is selected. The objects to be weighed are discharged simultaneously from the combination hoppers 4A, 4B, 4C selected by the above combination processing.

  FIG. 4 is a timing chart showing an example of opening / closing operation of each of the weighing hopper 4 (combination hoppers 4A, 4B, 4C), intermediate hoppers 7b, 7c, and discharge hoppers 8a, 8b, 8c of the combination weigher according to the present embodiment. It is a chart. This timing chart is shown using the same conditions as the timing chart of FIG. Further, on the line indicating the operation timing of the lower hopper (7b, 7c, 8a, 8b, 8c) from the start time and end time of the gate opening operation of each upper hopper (4A, 4B, 4C, 7b, 7c) The meaning of the broken line extending to the same is the same as in the case of FIG.

  As shown in FIG. 4, the objects to be weighed discharged simultaneously from the combination hoppers 4A, 4B, and 4C are collected and temporarily held in the discharge hopper 8a and intermediate hoppers 7b and 7c, respectively. The objects to be weighed collected in the intermediate hoppers 7b and 7c are simultaneously transferred to the discharge hoppers 8b and 8c and temporarily held. The objects to be weighed transferred to the respective discharge hoppers 8a, 8b, 8c in this way are discharged from the respective discharge hoppers 8a, 8b, 8c at different timings, and the two lower chutes 9L, 9R. Alternately discharged. The objects to be weighed discharged from the discharge hopper when the gate is opened at times TR1 to TR6 are discharged to the lower chute 9R, and the objects to be weighed are opened from the discharge hopper at times TL1 to TL6. Is discharged to the lower chute 9L. In the discharge hopper 8a, a discharge operation is performed so that the objects to be weighed are discharged alternately to the lower chute 9R and the lower chute 9L, and this discharge operation cycle is equal to the weighing cycle T. For example, when the gate of the discharge hopper 8a is opened at time TR2 and the object to be weighed is discharged to the lower chute 9R, the gate of the discharge hopper 8b is opened at time TL3 and the object to be weighed is moved to the lower chute 9L. Further, at time TR3, the gate of the discharge hopper 8c is opened, and the object to be weighed is discharged to the lower chute 9R. Subsequently, when the gate of the discharge hopper 8a is opened at time TL4 and the object to be weighed is discharged to the lower chute 9L, the gate of the discharge hopper 8c is opened at time TR4 and is measured to the lower chute 9R. The material is discharged, and further, at time TL5, the gate of the discharge hopper 8b is opened, and the object to be weighed is discharged to the lower chute 9L. The timing at which the objects to be weighed are alternately discharged to the lower chute 9R and the lower chute 9L is shifted by a time of T / 3. By operating as described above, it is possible to discharge to the two lower chutes 9L and 9R three times each in two weighing cycles (2 × T).

  In the second embodiment, similarly to the first embodiment, the object to be weighed is discharged three times from the discharge ports 9La and 9Ra in two weighing cycles, and a high-speed discharging operation is possible. Between the inner chute 6a and outer chute 6b, 6c and the lower chutes 9L, 9R, a total of five hoppers including two intermediate hoppers 7b, 7c and three discharge hoppers 8a, 8b, 8c are used. What is necessary is to reduce the number of hoppers used in the conventional example and simplify the structure. Furthermore, with respect to the first embodiment, the discharge hopper configured to be selectively discharged in the two directions of the lower chute 9L and the lower chute 9R is only one discharge hopper 8a, and the other two discharge hoppers 8b, Since 8c does not need to be selectively discharged in two directions, the gate structure is simplified. Further, a discharge hopper 8a is disposed on the boundary between the lower chute 9L and the lower chute 9R, a discharge hopper 8b is disposed on the lower chute 9L, and a discharge hopper 8c is disposed on the lower chute 9R. By receiving the objects to be weighed from the two discharge hoppers, the shape of the upper opening for receiving the objects to be weighed in the lower chutes 9L and 9R is close to a square from the elongated shape (FIG. 1 (c)). The opening can be made smaller and the height of the lower chutes 9L and 9R can be made smaller. Therefore, the overall height of the combination weigher can be reduced. Further, since the distance from the discharge hoppers 8a, 8b, 8c to the bottom of the bag of the packaging machine can be shortened, the length from the beginning to the end of the objects to be weighed discharged from the discharge hoppers 8a, 8b, 8c is increased. And the operation speed of the combination weigher and the packaging machine can be further improved.

  In the first and second embodiments described above, two intermediate hoppers (7b, 7c) are provided at the outlets of the outer chutes 6b, 6c without providing the intermediate hopper at the outlet of the inner chute 6a. However, the intermediate hopper is provided at the outlet of the inner chute 6a, the intermediate hopper is provided at one of the outer chutes 6b and 6c, and the intermediate hopper is not provided at the other outlet. You can also

(Embodiment 3)
FIG. 5 (a) is a schematic schematic view of a partial cross section of the combination weigher according to the third embodiment of the present invention viewed from the side, and FIG. 5 (b) is an assembly chute (inner chute and inner chute) of the combination weigher. FIG. 5C is a schematic schematic view of the two lower chutes and the discharge hopper of the combination weigher as viewed from above.

  The combination weigher of the third embodiment is different from the first embodiment in that the intermediate hopper 7a is disposed at the discharge port 6ae of the inner chute 6a and the discharge hopper 8a is disposed below the intermediate hopper 7a. The other configuration is the same as that of the first embodiment, and thus the description thereof is omitted. In the case of the third embodiment, the objects to be weighed discharged from the weighing hopper 4 to the inner chute 6a are temporarily held by the intermediate hopper 7a and then supplied to the discharge hopper 8a.

  The control unit 20 performs a combination process similar to that of the first embodiment on the basis of the measured value of the weighing hopper 4 (measured value by the weight sensor 41) and controls the operation of the entire combination weigher.

  The operation of the combination weigher configured as described above will be described.

  As in the case of the first embodiment, an object to be weighed is put into the weighing hopper 4 and measurement by the weight sensor 41 is performed. The control unit 20 performs combination processing in the same manner as in the first embodiment on the basis of the measurement value of the weighing hopper 4 (measured value by the weight sensor 41), and the weighing hopper 4 (combination hoppers 4A, 4B, 4C) to be discharged. ) Is selected. The objects to be weighed are discharged simultaneously from the combination hoppers 4A, 4B, 4C selected by the above combination processing.

  FIG. 6 shows an example of the opening / closing operation of each of the weighing hopper 4 (combination hoppers 4A, 4B, 4C), intermediate hoppers 7a, 7b, 7c and discharge hoppers 8a, 8b, 8c of the combination weigher of this embodiment. It is a timing chart which shows. This timing chart is shown using the same conditions as the timing chart of FIG. In addition, although the intermediate hopper 7a is added here, the conditions regarding the intermediate hopper 7a are the same as the conditions regarding the other intermediate hoppers 7b and 7c. The operation of the lower hopper (7a, 7b, 7c, 8a, 8b, 8c) from the start time and the end time of the gate opening operation of each upper hopper (4A, 4B, 4C, 7a, 7b, 7c) The meaning of the broken line extending on the line indicating the timing is the same as in the case of FIG.

  As shown in FIG. 6, the objects to be weighed simultaneously discharged from the combination hoppers 4A, 4B, and 4C are collected and temporarily held in the intermediate hoppers 7a, 7b, and 7c, respectively. The objects to be weighed collected in the intermediate hoppers 7a, 7b, 7c are further transferred to the discharge hoppers 8a, 8b, 8c and temporarily held. Here, the gate opening / closing operation timing of the intermediate hopper 7a and the intermediate hopper 7b is made the same, and the gate opening operation of the intermediate hopper 7c is started 150 ms later than the start of the gate opening operation of the intermediate hoppers 7a, 7b. ing. The objects to be weighed transferred to the respective discharge hoppers 8a, 8b, 8c in this way are discharged from the respective discharge hoppers 8a, 8b, 8c at different timings, and the two lower chutes 9L, 9R. Alternately discharged. The discharge hoppers 8a, 8b, 8c whose gates are opened at times TR1 to TR6 open the gates for discharging the objects to be measured to the lower chute 9R side, and the discharge hoppers whose gates are opened at times TL1 to TL6. 8a, 8b, and 8c open the gate for discharging the object to be weighed to the lower chute 9L side. Each of the discharge hoppers 8a, 8b, and 8c performs a discharge operation so as to discharge the object to be measured alternately to the lower chute 9R and the lower chute 9L. The discharge operation cycles of the discharge hoppers 8a, 8b, and 8c are equal to the weighing cycle T and are shifted by a time of T / 3. By operating as described above, it is possible to discharge to the two lower chutes 9L and 9R three times each in two weighing cycles (2 × T).

  In the third embodiment, as in the first embodiment, the object to be weighed is discharged three times from the discharge ports 9La and 9Ra in two weighing cycles, and a high-speed discharging operation is possible. Between the inner chutes 6a and outer chutes 6b, 6c and the lower chutes 9L, 9R, a total of six hoppers including three intermediate hoppers 7a, 7b, 7c and three discharge hoppers 8a, 8b, 8c And the number of hoppers used in the conventional example can be reduced, and the structure can be simplified.

(Embodiment 4)
FIG. 7 (a) is a schematic schematic view of a partial cross section of the combination weigher according to Embodiment 4 of the present invention viewed from the side, and FIG. 7 (b) is an assembly chute (inner chute and inner chute) of the combination weigher. FIG. 7C is a schematic schematic view of the two lower chutes and the discharge hopper of the combination weigher as viewed from above.

  Unlike the above-described second embodiment, the combination weigher according to the fourth embodiment has an intermediate hopper 7a disposed at the discharge port 6ae of the inner chute 6a and a discharge hopper 8a disposed below the intermediate hopper 7a. The other configuration is the same as that of the second embodiment, and thus the description thereof is omitted. In the case of the fourth embodiment, the objects to be weighed discharged from the weighing hopper 4 to the inner chute 6a are temporarily held by the intermediate hopper 7a and then supplied to the discharge hopper 8a.

  The control unit 20 performs a combination process similar to that of the first embodiment on the basis of the measured value of the weighing hopper 4 (measured value by the weight sensor 41) and controls the operation of the entire combination weigher.

  The operation of the combination weigher configured as described above will be described.

  As in the case of the first embodiment, an object to be weighed is put into the weighing hopper 4 and measurement by the weight sensor 41 is performed. The control unit 20 performs combination processing in the same manner as in the first embodiment on the basis of the measurement value of the weighing hopper 4 (measured value by the weight sensor 41), and the weighing hopper 4 (combination hoppers 4A, 4B, 4C) to be discharged. ) Is selected. The objects to be weighed are discharged simultaneously from the combination hoppers 4A, 4B, 4C selected by the above combination processing.

  FIG. 8 shows an example of the opening / closing operation of the gates of the weighing hopper 4 (combination hoppers 4A, 4B, 4C), intermediate hoppers 7a, 7b, 7c and discharge hoppers 8a, 8b, 8c of the combination weigher of this embodiment. It is a timing chart which shows. This timing chart is shown using the same conditions as the timing chart of FIG. In addition, although the intermediate hopper 7a is added here, the conditions regarding the intermediate hopper 7a are the same as the conditions regarding the other intermediate hoppers 7b and 7c. The operation of the lower hopper (7a, 7b, 7c, 8a, 8b, 8c) from the start time and the end time of the gate opening operation of each upper hopper (4A, 4B, 4C, 7a, 7b, 7c) The meaning of the broken line extending on the line indicating the timing is the same as in the case of FIG.

  As shown in FIG. 8, the objects to be weighed simultaneously discharged from the combination hoppers 4A, 4B, 4C are collected and temporarily held in the intermediate hoppers 7a, 7b, 7c, respectively. The objects to be weighed collected in the intermediate hoppers 7a, 7b, 7c are further transferred to the discharge hoppers 8a, 8b, 8c and temporarily held. Here, the opening / closing operation timings of the intermediate hopper 7b and the intermediate hopper 7c are made the same, and the opening operation of the intermediate hoppers 7b and 7c is started 150 ms later than the start of the opening operation of the intermediate hopper 7a. ing. The objects to be weighed transferred to the respective discharge hoppers 8a, 8b, 8c in this way are discharged from the respective discharge hoppers 8a, 8b, 8c at different timings, and the two lower chutes 9L, 9R. Alternately discharged. The objects to be weighed discharged from the discharge hopper when the gate is opened at times TR1 to TR6 are discharged to the lower chute 9R, and the objects to be weighed are opened from the discharge hopper at times TL1 to TL6. Is discharged to the lower chute 9L. In the discharge hopper 8a, a discharge operation is performed so that the objects to be weighed are discharged alternately to the lower chute 9R and the lower chute 9L, and this discharge operation cycle is equal to the weighing cycle T. For example, when the gate of the discharge hopper 8a is opened and the object to be weighed is discharged to the lower chute 9R at time TR3, the gate of the discharge hopper 8b is opened and the object to be weighed is moved to the lower chute 9L at time TL3. Further, at time TR4, the gate of the discharge hopper 8c is opened, and the object to be weighed is discharged to the lower chute 9R. Subsequently, when the gate of the discharge hopper 8a is opened at time TL4 and the object to be weighed is discharged to the lower chute 9L, the gate of the discharge hopper 8c is opened at time TR5 and is then weighed to the lower chute 9R. The material is discharged, and further, at time TL5, the gate of the discharge hopper 8b is opened, and the object to be weighed is discharged to the lower chute 9L. The timing at which the objects to be weighed are alternately discharged to the lower chute 9R and the lower chute 9L is shifted by a time of T / 3. By operating as described above, it is possible to discharge to the two lower chutes 9L and 9R three times each in two weighing cycles (2 × T).

  In the fourth embodiment, as in the second embodiment, the object to be weighed is discharged three times from the discharge ports 9La and 9Ra in two weighing cycles, and a high-speed discharging operation is possible. Between the inner chutes 6a and outer chutes 6b, 6c and the lower chutes 9L, 9R, a total of six hoppers including three intermediate hoppers 7a, 7b, 7c and three discharge hoppers 8a, 8b, 8c And the number of hoppers used in the conventional example can be reduced, and the structure can be simplified. In the fourth embodiment, one intermediate hopper 7a is increased as compared with the second embodiment, but the same effects as in the second embodiment can be obtained except for this.

  In the first to fourth embodiments, the weighing hoppers 4 are arranged in a circle, but the configuration is not limited to this. For example, the weighing hopper 4 is arranged not only in a circular shape but also in an annular shape including an elliptical shape, a polygonal shape such as a rectangle and a rectangle, and the inner chute 6a and the outer chute 6b corresponding to the arranged weighing hoppers 4, 6c should just be arrange | positioned. Further, in the configuration in which the weighing hoppers 4 are arranged in the above rectangular shape, the weighing hoppers 4 are arranged in two lines in a straight line without the weighing hoppers 4 being arranged on the two short sides of the rectangle. Other configurations may be used. In this case, for example, between the two outer chutes (6b, 6c) in which the upper opening shape for receiving the objects to be weighed discharged from the weighing hopper 4 is rectangular, one upper opening shape is similarly rectangular. The inner chute (6a) is arranged, and the weighing hopper 4 is arranged on the boundary between each outer chute and the inner chute.

  Moreover, in said Embodiment 1-4, the control part 20 does not necessarily need to be comprised with a single control apparatus, the some control apparatus is distributedly arranged, and they cooperate and they of a combination weigher. It may be configured to control the operation.

  In the first to fourth embodiments, the combination processing by the control unit 20 is the weight of the object to be weighed supplied to the weighing hopper 4 selected for each of the combination hoppers 4A, 4B, 4C to be obtained. The combined weight value, which is the sum of the values (measured values by the weight sensor 41), only needs to be within an allowable range with respect to the target weight value, and combination processing by other methods may be performed. In order to further improve the overall combination weighing accuracy of the objects to be weighed discharged from the combination hoppers 4A, 4B, and 4C, it is preferable to perform combination processing described below.

  This combination process includes a first process and a second process. In the first process, the weighing hoppers for each of the groups A, B, and C of the weighing hoppers 4 corresponding to the respective chutes 6a, 6b, and 6c. 4 is a combination of the weighing hoppers 4 in which the combined weight value, which is the sum of the weight values of the objects to be weighed (measured by the weight sensor 41), is within an allowable range with respect to the target weight value. An appropriate amount combination set is obtained in which the appropriate amount combinations of the groups A, B, and C are combined one by one and the same weighing hopper 4 is not included in the appropriate amount combinations of the different groups to be combined.

  Subsequently, in the second process, for each appropriate amount combination set obtained in the first process, the sum of the difference between the combination weight value of each appropriate amount combination included in the appropriate amount combination set and the target weight value is calculated, Select one appropriate combination set having the smallest difference, and from the weighing hoppers 4 belonging to each appropriate combination included in the selected appropriate combination set, target groups A, B, It is determined that the objects to be weighed are discharged to the chutes 6a, 6b and 6c corresponding to C.

  By performing this combination processing, an appropriate combination set having the minimum difference between the combination weight value of each appropriate combination and the target weight value is selected, and the measurement belonging to each appropriate combination included in the appropriate combination set. Since the objects to be weighed are discharged from the hopper 4 to the chutes 6a, 6b, and 6c corresponding to the target groups A, B, and C that are obtained as appropriate combinations of the hoppers 4, to the chutes 6a, 6b, and 6c. It is possible to improve the combination weighing accuracy as a whole of the objects to be discharged. Therefore, it is preferable that the control unit 20 includes combination means for performing the combination processing as described above.

  The first process can be roughly divided into the following two methods. One method is for each group A, B, C corresponding to each chute 6a, 6b, 6c, the weight value of the object to be weighed in each weighing hopper 4 (measured value by the weight sensor 41). ) To obtain all combinations of the weighing hoppers 4 whose combined weight value is within an allowable range with respect to the target weight value, and make these combinations appropriate amounts. Then, an appropriate amount combination set obtained by combining the appropriate amount combinations of the groups A, B, and C one by one is obtained. At this time, the same weighing hopper 4 is not selected for the appropriate combination of group A and the appropriate combination of group B, which constitutes an appropriate appropriate combination set, and is the same as the appropriate combination of group A and the appropriate combination of group C. The appropriate amount combination set is obtained by combining the appropriate amount combinations of the groups A, B, and C so that the weighing hopper 4 is not selected.

  In this method, when obtaining an appropriate amount combination, for each group A, B, C, among the combinations of the weighing hoppers 4 in which the combination weight value is within the allowable range with respect to the target weight value, each combination weight value and the target Priority may be given to the one having a small difference from the weight value (the absolute value of the value obtained by subtracting the target weight value from the combination weight value), and a predetermined amount of n (n is a plurality), for example, 10 may be selected to obtain an appropriate amount combination. Thereby, the combination processing time can be shortened.

  One other method is for either one of the inner chutes (6a) and the outer chutes (6b, 6c), for example each of the groups B, C corresponding to the outer chutes 6b, 6c, respectively. A combination of the weighing hoppers 4 in which the combined weight value is within an allowable range with respect to the target weight value by performing a combination calculation based on the weight of the objects to be weighed (measured value by the weight sensor 41) put in each weighing hopper 4 All of these are obtained, and the combination thereof is set as an appropriate amount combination (first appropriate amount combination). Then, a semi-appropriate amount combination set obtained by combining the appropriate amount combinations of the groups B and C one by one is obtained. Next, the weight of the object to be weighed put in the weighing hopper 4 excluding any one semi-optimal amount combination set from the group A of the weighing hoppers 4 corresponding to the inner chute 6a for which the above-mentioned appropriate amount combination is not obtained is determined. Based on the combination calculation, one combination of the weighing hopper 4 in which the combination weight value is within the allowable range with respect to the target weight value and the difference from the target weight value is the smallest is obtained, An appropriate amount combination of group A corresponding to one semi-appropriate amount combination set is set. Similarly, an appropriate amount combination (second appropriate amount combination) of group A corresponding to each of all the previously determined semi-appropriate amount combination sets is obtained. Then, an appropriate amount combination set is obtained by combining each of the semi-appropriate amount combination sets with an appropriate amount combination of group A corresponding to each.

  In this method, when obtaining the first appropriate combination, for each of the groups B and C, among the combinations of the weighing hoppers 4 whose combination weight value is within the allowable range with respect to the target weight value, Priority is given to the one having a small difference from the target weight value (the absolute value of the value obtained by subtracting the target weight value from the combination weight value), and a predetermined amount (n is a plurality), for example, 10 may be selected to obtain an appropriate amount combination. . Thereby, the combination processing time can be shortened.

  Further, in this method, if an appropriate amount combination is obtained for the group A of the weighing hopper 4 corresponding to the inner chute 6a as the first appropriate amount combination to be obtained first, each of the appropriate amount combinations of the group A is a semi-appropriate amount combination set. It becomes. In this case, one appropriate combination of the groups B and C (second appropriate combination) is obtained for each of the semi-appropriate combination sets, and each of the semi-appropriate combination sets is associated with each group. What is necessary is just to obtain | require the appropriate quantity combination set which combines the appropriate quantity combination of B and C one by one.

  The combination weigher according to the present invention is useful as a combination weigher connected to two packaging machines or a twin type packaging machine.

(A) is the schematic schematic diagram of the partial cross section which looked at the combination balance of Embodiment 1 of this invention from the side, (b) is an assembly chute (inner chute and two outer chutes) of the combination weigher ) And the weighing hopper as viewed from above, and (c) is a schematic diagram as viewed from above of the two lower chutes and the discharge hopper of the combination weigher. It is a timing chart which shows an example of operation | movement of the combination weigher of Embodiment 1 of this invention. (A) is the schematic schematic diagram of the partial cross section which looked at the combination balance of Embodiment 2 of this invention from the side, (b) is the collective chute (inner chute and two outer chutes) of the combination weigher ) And the weighing hopper as viewed from above, and (c) is a schematic diagram as viewed from above of the two lower chutes and the discharge hopper of the combination weigher. It is a timing chart which shows an example of operation | movement of the combination scale of Embodiment 2 of this invention. (A) is the schematic schematic diagram of the partial cross section which looked at the combination balance of Embodiment 3 of this invention from the side, (b) is the collective chute (inner chute and two outer chutes) of the combination weigher ) And the weighing hopper as viewed from above, and (c) is a schematic diagram as viewed from above of the two lower chutes and the discharge hopper of the combination weigher. It is a timing chart which shows an example of operation | movement of the combination scale of Embodiment 3 of this invention. (A) is the schematic schematic diagram of the partial cross section which looked at the combination balance of Embodiment 4 of this invention from the side, (b) is the collective chute (inner chute and two outer chutes) of the combination weigher ) And the weighing hopper as viewed from above, and (c) is a schematic diagram as viewed from above of the two lower chutes and the discharge hopper of the combination weigher. It is a timing chart which shows an example of operation | movement of the combination weigher of Embodiment 4 of this invention. (A) is the schematic schematic diagram of the partial cross section which looked at the combination weigher of the conventional example from the side, (b) is the collective chute (inner chute and two outer chutes) and the weighing hopper of the same combination weigher. It is the schematic model seen from the upper part, (c) is the schematic model figure which looked at two lower chutes, the intermediate hopper, and the discharge hopper of the combination weigher from the upper part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dispersing feeder 2 Linear feeder 3 Supply hopper 4 Weighing hopper 5 Center base 6a Inner chute 6b, 6c Outer chute 7a, 7b, 7c Middle hopper 8a, 8b, 8c Discharge hopper 9L, 9R Lower chute 20 Control part

Claims (4)

A plurality of weighing hoppers arranged in a ring, weighing each of the objects to be weighed, and selectively discharging the objects to be measured in two directions inside and outside the ring;
An inner chute that is disposed below the weighing hopper and collects objects to be weighed discharged inward from the weighing hopper and discharges them from a lower discharge port;
First and second outer chutes disposed around the inner chute and collecting the objects to be weighed discharged from the weighing hopper in the outer direction and discharged from the lower discharge port;
A second one provided at a discharge port of any two of the inner chute, the first outer chute, and the second outer chute, and temporarily holds and discharges an object to be weighed discharged from the discharge port. A first and second intermediate hopper;
First and second discharge hoppers that temporarily hold and discharge the objects to be discharged from the first and second intermediate hoppers;
Out of the inner chute, the first outer chute and the second outer chute, the discharge port is provided with a discharge port of the chute in which the first and second intermediate hoppers are not provided. A third discharge hopper for temporarily holding and discharging discharged objects to be weighed;
First and second lower chutes disposed below the first, second and third discharge hoppers, each having a discharge port;
The first, the first, the second, the second, and the second lower chute are alternately discharged so that the objects to be weighed are sequentially discharged from the discharge hoppers at different timings. Control means for controlling the second and third discharge hoppers ,
A total of five hoppers are provided between the inner chute, the first outer chute and the second outer chute, and the first and second lower chutes. The hopper is a combination weigher comprising the first and second intermediate hoppers and the first, second and third discharge hoppers .   The first, second and third discharge hoppers are arranged in a straight line, and the first and second lower chutes are arranged in a direction perpendicular to the arrangement direction of the discharge hoppers, and the first The combination weigher according to claim 1, wherein each of the second and third discharge hoppers is configured to selectively discharge the object to be weighed to the first lower chute and the second lower chute.   The first, second and third discharge hoppers are arranged in a straight line, and the first and second lower chutes are arranged in the same direction as the arrangement direction of the discharge hoppers. The discharge hopper disposed in the center of the second and third discharge hoppers is configured to selectively discharge the objects to be weighed to the first lower chute and the second lower chute, The discharge hopper disposed above the first lower chute other than the discharge hopper disposed in the center discharges the object to be weighed to the first lower chute, and above the second lower chute. The combination weigher according to claim 1, wherein the discharge hopper arranged at the position is configured to discharge an object to be weighed to the second lower chute. The first intermediate hopper is provided at an outlet of the first outer chute, and the second intermediate hopper is provided at an outlet of the second outer chute. Combination weigher .

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