JPH04129536A - Balance device - Google Patents

Abstract

PURPOSE:To obtain a balance device with which the balance precision is improved, by correcting the detection error of a weight detecting means which is caused by the tilt of a container supporting part, according to the tilt of the container supporting part, and installing a control means for obtaining the weight in a container on the container supporting part. CONSTITUTION:As for a blood taking device 10, a bag receiving plate 19 is supported on a balance 33 which is cantilever-supported through a balance installation member 31, and the CPU 65 of a main control circuit 61 detects the weight of a blood bag 1 on the bag receiving plate 19 in the vertical direction for the hag receiving plate, from the output V2 of a weight detecting sensor 34 consisting of a strain guage on the basis of the torsional deformation of the balance 33. Further, the CPU 65 of the main control circuit 61 calculates the tilt angle theta which the bag receiving plate 19 forms for the vertical direction in the case when a weight detection sensor 34 detects weight, from the output V1 of a tilt detection sensor 100 installed on the bag receiving plate 19 or a swing frame 22. The CPU 65 of the main control circuit 61 detects the correct weight of the blood bag 1 by correcting the output V2 of the weight detection sensor 34 by using the tilt angle theta, and the blood taking-in quantity is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a weighing device for determining the internal weight of a blood container or the like in a blood sampling device or a plasma separation device.

[Prior Art] Conventionally, a blood sampling device as described in Japanese Unexamined Patent Publication No. 1-288236 has been proposed. In conventional blood sampling devices, a blood bag is stored on a bag tray in a blood sampling chamber, and a weight sensor detects when the weight of the blood bag, which increases with blood sampling, reaches a predetermined level, and the blood sampling operation is performed based on this detection result. As a result, a predetermined amount of blood is collected in the blood bag.

In this conventional blood sampling device, while blood is being collected into the blood bag, the receiver of the blood bag is swung, thereby stirring the blood and an anticoagulant such as heparin that is preloaded in the blood bag. , prevent blood clotting.

[Invention or problem to be solved M] However, in the above-mentioned prior art, the weight sensor is configured to detect the weight of the blood bag on the bag tray in a direction perpendicular to the bag support surface of the bag tray. ing.

For this reason, if the place where the blood sampling device is installed is not horizontal, or if the swing angle position or stop angle position of the bag tray when detecting one weight deviates from a predetermined angular position, the weighing accuracy decreases.

SUMMARY OF THE INVENTION An object of the present invention is to improve weighing accuracy even when weighing is performed in a non-horizontal location or when weighing is performed under conditions where there is an error in the inclination of the container support part in the weight detection system.

[Means for Solving the Problems] The present invention as set forth in claim 1 provides a container support for supporting a container for storing a liquid or a solid, and a weight for detecting the internal weight of the container on the container support. In a weighing device comprising a detection means, an inclination detection means for detecting the inclination of the container support with respect to the vertical direction, a detection result of the weight detection means and a detection result of the inclination detection means, Detecting the inclination of the container support part when the weight detection means detects the weight,
The apparatus further includes a control means for correcting a detection error of the weight detecting means due to the inclination of the container support according to the inclination of the container support and determining the weight inside the container on the container support.

According to a second aspect of the present invention, the container support section is periodically oscillated, and the weight inside the container is detected in synchronization with the period of the oscillation.

According to a third aspect of the present invention, the swinging of the container supporting portion is stopped every cycle, and the weight inside the container is detected within the period when the swinging is stopped.

The present invention as set forth in claim 4 provides a blood weighing device comprising a container support part for supporting a blood container and a weight detection means for detecting the weight inside the container on the container support part. an inclination detection means for detecting the inclination made by the weight detection means with respect to the vertical direction; and a detection result of the weight detection means and a detection result of the inclination detection means, and detects the inclination of the container support part when the weight detection means detects the weight. and a control means for correcting the detection error of the weight detection means due to the inclination of the container support according to the inclination of the container support and determining the weight inside the container on the container support. It is.

[Operation] FIG. 10 shows an equivalent circuit of the tilt detection sensor 100, and FIG. 11 shows the output characteristics of the tilt detection sensor 100. For example, when the magnet 110 that swings together with the container support changes the relative area with respect to the left and right magnetoresistive elements MRI and MR2, the tilt detection sensor 100 detects the difference between the left and right magnetoresistive elements MRI and MR2.
According to the change in resistance of R2, its resistance value changes in proportion to the inclination angle θ of the container support (= inclination made with respect to the vertical direction), and its output voltage v1 also changes in proportion to the inclination angle θ. .

As a result, the output voltage Vl(θ) of the tilt detection sensor 100 at the tilt angle θ is expressed by the following equation (1).

...(1) Here, v1hoas and v1■in each have an inclination angle of +
This is the output voltage when θzenaX and -θhoin (first
(See Figure 1).

The above equation (1) can be simplified as shown in the following equation (2).

Vl(e) = AI-e + Vsid
-(2) Here, since Vmid and A1 are constants, θ is calculated from vl as shown in equation (3) below.

A1...(3)
On the other hand, FIG. 12 shows the detection state of the weight detection sensor 34, and FIG. 13 shows the output characteristics of the weight detection sensor 34. The output voltage v2 (m) of the weight detection sensor 34 is the container weight m
Since it is proportional to g, it is expressed by the following equation (4).
.

Here, V 2 wax and V 2 off are the output voltages when the masses are Mmax and 0, respectively (the first
(See Figure 3).

The above equation (4) can be simplified as shown in the following equation (5). A
2 is a constant.

V2(a) = A2・mg + V2off
- (5) At the inclination angle θ, as shown in FIG.
4, the apparent weight is mgco3θ.

Therefore, the above equation (5) can be accurately expressed as the following equation (6).

V2(e) = A2・mgcosθ + V2off
(6) Therefore, the weight in mg is expressed by the following equation (7).

From the above, calculate θ using equation (3), and convert this θ to (7')
By substituting into the formula, you can obtain the exact mg.

FIG. 9 is a block diagram of the weighing device of the present invention. The output signal from the weight detection sensor 34 is amplified by an amplifier 34A, and then sent to a sample hold 34B and an A/D converter 3.
4C and is input to CP[J65 as a digital signal V2. On the other hand, the output signal from the tilt detection sensor 100 is also amplified by the amplifier 100A and then sent to the sample hold 1.
00B and the A/D converter 1ooc, and is input to the CPTJ65 as a digital signal V1.

Therefore, the CPU 65 calculates the inclination angle θ from vl, corrects V2 using equation (7), and calculates the exact container weight m.
g, and thus the accurate weight inside the container.

According to the above, according to the present invention as set forth in claim 1,
Improves weighing accuracy when detecting the internal weight of a container storing liquid or solid, even when weighing in a non-horizontal location or when there is an error in the tilt of the container support during weight detection. can do.

Furthermore, according to the second aspect of the present invention, weighing accuracy can be improved even when the swing angular position of the container support section at the time of weight detection is shifted from a predetermined angular position.

Furthermore, according to the third aspect of the present invention, weighing accuracy can be improved even when the stopping angular position of the container support portion during weight detection is shifted from a predetermined angular position.

Note that since the weighing is performed in a stopped state, the weighing accuracy can be further improved.

Further, according to the present invention as set forth in claim 4, when detecting the internal weight of a blood container in a blood sampling device, a plasma separation device, etc., the weight of the container is measured in a non-horizontal place, or the container support portion is Weighing accuracy can be improved even when weighing in a state where there is an error in the tilt [Example] FIG. 1 is a front view showing a blood sampling device according to an example of the present invention, and FIG. Figure 3 is a plan view of Figure 1, Figure 4 is a side view of the scale, Figure 5 is a vacuum circuit diagram, Figure 6 is a swing state line. 7 is a device block diagram, and FIG. 8 is a control block diagram.

As shown in FIGS. 1 to 3, the blood sampling device 10 includes a display panel 12 on the front of the housing 11.
A vacuum blood collection chamber 13 is formed inside. 14 is the opening/opening lid of the blood collection chamber 13, 15 is the hinge of the lid 14, and 16 is the blood collection chamber 1.
This is a sealing rubber for sealing 3. 14A is a handle of the lid 14. Further, the blood collection bag 210 has a built-in vacuum pump 17 and a control device t18 in the lower part of the housing 11.

The vacuum blood collection chamber 13 of the blood collection device 10 is connected to an inlet port 17A of a vacuum pump 17 to be able to reduce the pressure, and also has a bag receiver 11 [119] that supports a blood bag (blood container) 1 made of polyvinyl chloride or the like. We are prepared. Blood sampling device 1
0, blood is collected by applying a predetermined decompression pressure to the blood bag 1 supported by the bag receiving tray 19 under a state in which the vacuum blood collection chamber 13 is depressurized. At this time, the blood collecting device 10 shakes the bag tray 19 to stir the blood and an anticoagulant such as heparin that has been preloaded in the blood bag 1, and also collects blood by measuring the weight of the blood bag 1. measure quantity.

The structure for swinging the above-mentioned bag tray 19 and the structure for measuring the weight of the blood bag 1 in the blood collection device 10 are as follows.

First, a pedestal 20 is installed at the bottom of the vacuum blood collection chamber 13.
A swing frame 22 that is rotatable is supported on this pedestal 20 via a support shaft 21 .

Further, a swing motor 23 is fixed to the pedestal 20, and a driving shaft 24 driven by the swing motor 23 is supported. A crank wheel 28 is fixed to one end of the driving shaft 24,
One end of a link 29 is connected to the rotation radius of the crank wheel 28, and the other end of the link 29 is connected to the swing frame 22.
is connected to.

On the other hand, a scale mounting member 31 is fixed to the upper surface of the swinging frame 22, and a scale (weight measuring means) 33 is supported by a cantilever on the scale mounting member 31. The scale 33 has a substantially rectangular shape (
It consists of a parallelogram frame. The scale 33 is equipped with strain gauges that are attached to two positions on the upper surface and two positions on the lower surface to form a Wheatstone bridge circuit as the weight detection sensors 34 described above in FIG.
The above-mentioned bag tray 19 is fixed to the tip of the bag 3 via a weighing platform 35 and a receiving plate 36. The scale 33 has a weight detection sensor amplification unit 38.

The weight detection sensor amplification unit 38 includes the amplifier 34A, sample hold 34B, and A described above in FIG.
/D converter 34C.

In addition, the bag tray 19 or the swing frame 22 has
In FIG. 10, the tilt detection sensor 100 described above is attached. The tilt detection sensor 100 has a tilt detection sensor amplification unit 101. Incidentally, the tilt detection sensor amplification unit 100 is the same as the amplifier 100 described above in FIG.
A, Sample hold 100B% A/D converter 10
It has 0C.

That is, the blood sampling device 10 rotates the driving shaft 24 and the crank wheel 28 by the operation of the swing motor 23, thereby swinging the swing frame 22, and is supported by the swing frame 22 via the scale 33. This means that the bag tray 19 will be rocked. At this time, as shown in FIGS. 2 and 6, the bag tray 19 moves two points above and below the highest point at +6 degrees from the horizontal and the lowest point at -8 degrees during the swinging process. It is made to swing as a turning point. In this example, it was confirmed that 020220 degrees is suitable. Furthermore, the period of one cycle of the swinging motion given by the swinging motor 23 to the bag tray 19 is equal to the power supply frequency of 60
Approximately 1.0 to 2.6 seconds in Hz area, power frequency 50Hz
In the region, it is about 1.2 to 3 seconds. If one cycle time is too long, the anticoagulant and blood in the blood bag 1 will not mix well, but if the cycle time is too long, the blood will not mix well with the anticoagulant in the bag tray 19.
A phenomenon occurs in which the blood in the blood bag 1 poorly follows the movement of the blood and becomes difficult to mix.

The blood sampling device 10 also includes a bag receiver 1 mounted on a scale 33 that is cantilever-supported on the swing frame 22 via a scale attachment member 31.
9, and supports the CPU 6 of the main control circuit 61, which will be described later.
5 detects the weight of the blood bag 1 on the bag receiving tray 19 in the direction perpendicular to the bag receiving surface using the output v2 of the weight detecting sensor 34 consisting of a strain gauge based on the deflection deformation of the scale 33.

In addition, CPtJ65 of the main control circuit 61 is connected to the bag tray 1.
9 or the output v1 of the tilt detection sensor 100 attached to the swing frame 22, the inclination angle θ that the bag tray 19 makes with respect to the vertical direction when the weight detection sensor 34 detects the weight is calculated using the above equation (3). calculate.

Then, the CPU 65 of the main control circuit 61 calculates the output v2 of the weight detection sensor 34 using the above-described angle of inclination θ (7).
By correcting the equation, the accurate weight of the blood bag 1 can be detected and the amount of blood collected can be measured.

The blood sampling device 10 detects the rotational position of the detection cam 39 provided at the other end of the driving shaft 24 using the optical sensor 40, and the control device 18 detects the current swinging of the bag tray 19 by the swinging motor 23. The angular position is recognized, and the detection results of the weight detection sensor 34 and the tilt detection sensor 100 are taken in with the back tray 19 at the turning point, either the highest point or the lowest point, and the blood bag is loaded. The weight of 1 is to be measured.

At this time, the control device 18 of the blood sampling device 10 controls the swing motor 23 from the beginning to the end of blood sampling into the blood bag 1.
For each swing period of the bag tray 19, the bag tray 1
9 is at the turning point, and when the detection results of the weight detection sensor 34 and the tilt detection sensor 100 are taken in, the swing motor 23
The rocking operation is temporarily stopped, and the rocking stop time for each rocking cycle is made longer on the end stage side.

As shown in FIG. 5, the blood collection device 10 connects the intake air D17A of the vacuum pump 17 and the vacuum blood collection chamber 13 with a vacuum pipe 41, and closes the intermediate part of the vacuum pipe 41 by turning on an exhaust solenoid 42. An exhaust valve 43 is provided which opens by gravity when the exhaust solenoid 42 is turned off. Blood sampling device 10
A constant negative pressure (degree of vacuum) is formed in the vacuum blood collection chamber 13 by on/off control of the vacuum pump 17, and when blood collection is completed, the vacuum blood collection chamber 13 is released to the atmosphere by opening the exhaust valve 43.

The amount of blood to be collected W10 can be determined by attaching a tube holder 4 to the upper part of the front side of the housing 11 adjacent to the vacuum blood collection chamber 13.
4, so that a blood collection tube 2 connected to a blood bag 1 housed in a vacuum blood collection chamber 13 can be drawn out. The tube holder 44 includes a tube clamp (blood collection stopping means) 46 driven by a tube clamp solenoid 45, and the tube clamp 46 clamps and closes the blood collection tube 2 to stop the blood collection operation into the blood bag 1. 47 is a clamp release button for the tube clamp 46, and 48 is a clamp button for operating the tube clamp 46 in an emergency.

In addition, in the blood sampling device 10, the t by the swing motor 23 is
When the sm is stopped, the blood collection tube 2 is connected to the blood bag 1.
The connection port (=blood introduction port) of the blood bag 1 is set to be located at the lowest level of the blood bag 1.

Blood sampling device! The display panel 12 of t10 includes a blood sampling amount/vacuum degree switching display lamp 49 and a blood sampling amount/vacuum degree switching switch 50.
, 400 heavy I2/2oolβ switching display lamp 51.40
0 intestinal β/2001I2 changeover switch 52, stop switch 53, start switch 54, used bag indicator lamp 55,
Use bag selection switch 56, blood collection amount/vacuum level display section 5
Equipped with 7. The blood sampling device 10 includes a power switch 58 and a fuse holder 59 at the lower front of the housing 11, and a power connector 60 at the lower rear of the housing 11.

Next, the control device 18 of the blood sampling device 10 will be explained.

The control device 18 mainly includes a main control circuit 61, a drive circuit 62, and a display circuit 63, as shown in FIG. Note that 64 is a power supply unit.

The main control circuit 61 includes a CPU (central processing unit) [device 10
65, memory (storage means) 66, input/output control unit 67, LED (light emitting diode) drive circuit 6
8, a buzzer 69, and a fail-safe circuit 70. The input/output control unit 67 is configured to transfer detection signals from the aforementioned optical sensor 40 that detects the swinging position of the bag tray 19 and the pond surface sensor 71 that detects blood leakage from the blood bag 1. It has become.

The memory 66 is composed of a non-volatile memory such as EA-ROM%EEP-ROM, and can rewrite and read stored data, and can hold stored data even without application of power supply voltage. The data stored in the memory 66 includes: (1) the removal pressure generated in the vacuum blood collection chamber 13; (2) the set amount of blood to be collected into the blood bag 1; (2) the extended period of swinging of the bag tray 19 after blood collection is completed.

The above-mentioned tether 69 sounds in different manners depending on the following: ■Completion of blood collection, ■Error in the removal pressure formed in the vacuum blood collection chamber 13, ■Error in the rotation of the swing motor 23, ■Detection of a shallow dish by the pond surface sensor 71, etc. It rings.

The failsafe circuit 70 monitors the occurrence of runaway in the CPU 65 and safely stops the device when the runaway occurs.

The drive circuit 62 is connected to the main control circuit 61, and
/D conversion circuit 72 is provided. The A/D conversion circuit 72 is connected to a weight detection sensor amplification unit 38 in which the weight detection sensors 34 described above are connected, and a tilt detection sensor amplification unit 101 in which the tilt detection sensors 100 are connected, and is connected to the A/D conversion circuit 72. A pressure sensor 73 for detecting the removal pressure of the vacuum blood collection chamber 13 is connected via a pressure sensor amplification circuit 74.

At this time, the CPU 65 of the control device 18, as described above,
Detection output v2 of weight detection sensor 34 and tilt detection sensor 1
00 detection output v1 is obtained, and the inclination angle θ of the back tray 19 when the weight detection sensor 34 detects the weight is set as described in (3) above.
The detection error of the weight detection sensor 34 due to the angle of inclination θ of the bag receiver 19 is corrected by the equation (7) above according to the angle of inclination θ of the bag receiver 19, and the The weight of the blood bag 1 is determined, and the weight of the collected blood is calculated.

The drive circuit 62 also includes: (1) a solenoid drive circuit 75 that controls the tube clamp solenoid 45; (2) a solenoid drive circuit 76 that controls the exhaust solenoid 42;
(1) A pump drive circuit 78 that turns on/off the power supply switch 77 of the vacuum pump 17; (2) A motor trites circuit 80 that turns on/off the power supply switch 79 of the swing motor 23.

Incidentally, the CPU 65 of the control device 18 controls the pressure sensor 73.
and the set pressure of the vacuum blood collection chamber 13, which is the data stored in the memory 66, and turn on/off the power supply switch 77 of the vacuum pump 17 as described above so that the detected pressure matches the set pressure. Control off. As a result, the removal pressure in the vacuum blood collection chamber 13 changes slightly within a certain range of the set pressure, resulting in a constant pressure state.

Next, a blood sampling operation procedure using the blood sampling apparatus 10 will be described.

■Turn on the power switch 58.

The amount of blood to be collected is selected using the 0400mβ/2001β changeover switch 52. This selection result is displayed on the switching display lamp 51.

■Select the bag to be used using the bag selection switch 56. This selection result is displayed on the display lamp 55. The types of bags used are single (S) with only a parent bag, double (D) with one or more small bags, etc.
-There are ripples (T) and quadruples (Q).

■Puncture the blood donor with the blood collection needle provided at the end of the blood collection tube 2, and collect some blood.

(2) Put the blood bag 1 into the vacuum blood collection chamber 13, place it on the bag receiving tray 19, and set the blood collection tube 2 in the tube holder 44.

■Turn on the start switch 54. The control device 18 drives and controls the vacuum pump 17 and the swing motor 23, and controls the vacuum blood collection chamber 1.
3, the blood is collected by reducing the pressure and the back tray 19 is swung. Further, the control device 18 controls the weight detection sensor amplification unit 3 at the above-mentioned timing when the bag tray 19 is at the turning point of either the highest point or the lowest point of the swinging process.
8 and the output of the tilt detection sensor amplification unit 101, the measured blood collection amount of the blood bag 1 is detected, and the set blood collection amount, blood specific gravity, and blood specific gravity written in the memory 66 are obtained.
Using the pre-registered weight of the blood bag 1, the remaining blood collection amount (volume) is calculated using the following equation (1).

Remaining blood sampling amount (Kou 12) = [Setting blood sampling amount (g) Juyo registration weight (g) - Measured blood sampling amount (
g)] /Specific Gravity/■β)...(1)■The control device 18 controls the blood collection tube 2 with the tube clamp 46 on the condition that the remaining blood collection amount, which is the result of the above calculation, has reached zero.
, and the operation of collecting blood into the blood bag 1 is stopped. At this time, the control device 18 stops the vacuum pump 17 and opens the exhaust valve 43 to release the vacuum blood collection chamber 13 to the atmosphere.

(2) After the blood collection is completed, the control device 18 extends and drives the swing motor 23 for a certain period of time to swing the bag tray 19. After that, a buzzer notifies you that blood collection is complete.

(2) Turn on the clamp release button 47, remove the blood collection tube 2 from the tube holder 44, and take out the blood bag 1 from the vacuum blood collection chamber 13.

Next, the operation of the above embodiment will be explained.

■ Due to the presence of the tilt detection sensor 100, the back saucer 19
The detection result of the weight detection sensor 34 due to the inclination of the bag tray 19 can be corrected according to the inclination of the bag tray 19. Therefore, when detecting the internal weight of the blood bag 1 in the blood sampling device 1o, even if the blood bag 1 is weighed in a non-horizontal place or in a state where there is an error in the tilt of the bag tray 19 at the time of weight detection, the weighing Accuracy can be improved.

■When weighing the blood sample in synchronization with the period of the swing of the bag tray 19, even if the swing angle position of the bag tray 19 at the time of weight detection is shifted from the predetermined angular position, the above This improves weighing accuracy.

■ When detecting the weight of blood collected during the period when the bag tray 19 is not swinging, even if the bag tray 19 is out of the predetermined angular position at the time of weight detection, due to the above (■), Weighing accuracy can be improved.

Next, experimental results of the present invention will be explained.

FIG. 14 shows weight data measured with a blood sampling device without a tilt detection sensor. A tilt of ±5 degrees causes an error of more than ±20 g (2.5%) for a weight of 800 g.

FIG. 15 shows weight data corrected according to the present invention using a tilt detection sensor. It is confirmed that the error is within ±5g.

Note that the present invention is widely applicable to weighing devices having a container support section that supports a container for storing liquid or solid, and a weight detection means for detecting the weight inside the container on the container support section. I'll come. Therefore, the present invention is applicable not only to blood sampling devices but also to, for example, plasma separation devices.

[Effects of the Invention] As described above, according to the present invention, weighing accuracy can be improved even when weighing in a non-horizontal location or when weighing in a state where there is an error in the tilt of the container support during weight detection. .

[Brief explanation of the drawing]

FIG. 1 is a front view showing a blood sampling device according to an embodiment of the present invention, FIG. 2 is a side view showing a main part of FIG. 1 broken away, FIG. The figure is a side view showing the scale, Figure 5 is a vacuum circuit diagram, Figure 6 is a swing state diagram, Figure 7 is a device block diagram, Figure 8 is a control block diagram, and Figure 9 is a control of the weighing device. A block diagram, FIG. 10 is an equivalent circuit diagram of the tilt detection sensor, and FIG. 11 is a diagram showing the output characteristics of the tilt detection sensor.
Fig. 12 is a schematic diagram showing the detection state of the weight detection sensor, Fig. 13 is a diagram showing the output characteristics of the weight detection sensor, and Fig. 14 is a diagram showing the output characteristics of the weight detection sensor.
15 is a diagram showing the weight detection accuracy by the conventional device, and FIG. 15 is a diagram showing the weight detection accuracy by the device of the present invention. DESCRIPTION OF SYMBOLS 1... Blood bag (blood container), 10... Blood collection device, 19... Back saucer (container support part), 23... Rocking motor, 34... Weight detection sensor, 65... CPU (control means), 100... tilt detection sensor.

Claims (4)

[Claims] (1) A weighing device comprising a container support section that supports a container for storing liquid or solid, and a weight detection means for detecting the weight inside the container on the container support section,
An inclination detection means for detecting the inclination of the container support with respect to the vertical direction, a detection result of the weight detection means, and a detection result of the inclination detection means are obtained, and the detection result of the container support is detected when the weight detection means detects the weight. and a control means for detecting the inclination, correcting a detection error of the weight detection means caused by the inclination of the container support according to the inclination of the container support, and determining the weight inside the container on the container support. Characteristic weighing device. (2) The weighing device according to claim 1, wherein the container support section is periodically oscillated and the weight inside the container is detected in synchronization with the period of the oscillation. (3) The weighing device according to claim 2, wherein the swinging of the container support part is stopped every cycle, and the weight inside the container is detected within the swinging stop period. (4) In a blood weighing device comprising a container support part that supports a blood container and a weight detection means for detecting the weight inside the container on the container support part, the container support part is vertically A tilt detection means for detecting the tilt, a detection result of the weight detection means and a detection result of the tilt detection means are obtained, and the tilt of the container support part is detected when the weight detection means detects the weight, and the tilt of the container support part is detected. A blood weighing device comprising: a control means for correcting a detection error of the weight detecting means due to the inclination of the container support according to the inclination of the container support and determining the weight inside the container on the container support.