Saline water injection mechanism for pickled meat

Abstract

A salty water injection mechanism for pickled meat comprises a cross beam, a conveyor belt for horizontal transmission is arranged below the cross beam, and a probe assembly and a plurality of injection assemblies are longitudinally arranged on the cross beam; a driving mechanism for driving the probe assembly and the injection assembly to longitudinally slide is also arranged on the cross beam; the probe assembly and the injection assembly are arranged on the cross beam in a sliding mode through sliding rails, and meat products firstly pass through the probe assembly and then pass through the injection assembly in the conveying direction of the conveying belt; a controller is further arranged and is in control connection with the probe assembly and the injection assemblies, after the probe assembly detects the position and depth of the hard bone of the meat product, the position and depth of the hard bone are transmitted to the controller, and the controller controls needle heads at the corresponding positions of the injection assemblies to actively retract by the corresponding depth in advance. The needle head of the injection needle is prevented from being damaged by bones in meat products, meanwhile, only the probe needs to be replaced, and frequent replacement of the needle head is avoided.

Description

Technical Field

[0001] The invention relates to a liquid dispensing device, in particular to a saline dispensing injection mechanism. Background Art

[0002] Automated brine distribution and injection equipment is usually used in the production of pickled meat products. This type of brine distribution and injection equipment usually uses a longitudinally movable injection head, on which a number of retractable injection needles are arranged, and a conveyor belt is provided below the injection head, on which the meat products to be injected are laid. The injection head moves longitudinally and presses down, so that the injection needle is inserted into the meat product to inject brine. Since there are usually bones in uncertain positions in meat products, in order to protect the needle, the injection needle needs to be set to be retractable. However, this requires a more complex injection needle installation structure, which not only needs to ensure that the injection needle has a certain downward pressure to be inserted into the meat product, but also needs to have the ability to retract when encountering bones. Even so, since several parallel injection heads are usually required, although the injection needle can be retracted, it needs to be in hard contact with the bone before it can be retracted. In the long run, the needle will still be damaged, resulting in bending of the needle and deformation of the injection hole, affecting the injection effect, and this damage is not easy to find and is inconvenient to replace. Usually, the injection head is replaced as a whole after a period of time instead of replacing the bad needle alone, resulting in a high cost of use.

[0003] Therefore, it is necessary to design a pickled meat brine injection detection and control mechanism to solve the problem that the needle structure is complex and easy to be damaged and does not need to be replaced in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a pickled meat brine injection mechanism to solve the technical problems in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A pickled meat brine injection mechanism, characterized in that it includes a crossbeam, a horizontal transmission conveyor belt is arranged below the crossbeam, and a probe assembly and a plurality of injection assemblies are longitudinally arranged on the crossbeam; a driving mechanism for driving the probe assembly and the injection assembly to slide longitudinally is also arranged on the crossbeam; the probe assembly and the injection assembly are both slidably arranged on the crossbeam through slide rails, and along the transmission direction of the conveyor belt, the meat product first passes through the probe assembly and then passes through the injection assembly; a controller is also provided, and the controller is control-connected with the probe assembly and each injection assembly, and after the probe assembly detects the hard bone position and depth of the meat product, the hard bone position and depth are transmitted to the controller, and the controller controls the needle at the corresponding position of the injection assembly to actively retract the corresponding depth in advance.

[0006] Preferably, the probe assembly comprises a moving beam, the moving beam is fixedly connected to the output end of the driving mechanism, and both ends of the moving beam are slidably arranged on slide rails on both sides; and a plurality of probe units are longitudinally arranged on the moving beam.

[0007] Preferably, the probe unit includes a probe cylinder, a probe, and a probe hydraulic circuit; the top end of the probe cylinder is fixedly arranged on the moving beam, the lower end of the probe cylinder is fixedly connected to the liquid supply beam, and a pressure plate is connected below the liquid supply beam through a limit rod and a spring.

[0008] Preferably, the top of the probe has a probe piston that expands relative to the needle body. The needle body of the probe moves in the first through hole at the lower end of the probe cylinder and extends outward. The inside of the probe cylinder has a probe cavity for the probe piston to move. The probe piston slides up and down in the probe cavity, and the shape of the probe piston matches the inner wall of the probe cavity.

[0009] Preferably, the rodless cavity at the top of the probe cavity is provided with a first oil outlet, and the rod cavity at the bottom of the probe cavity is provided with a first oil inlet; one end of the probe hydraulic circuit is connected to the first oil inlet, and the other end is connected to the first oil outlet; the probe hydraulic circuit is provided with a first variable pump, a first stop valve and an adjustable flow valve.

[0010] Preferably, a rotary encoder is provided at the pump shaft of the first variable pump, and the rotary encoder is communicatively connected with the controller.

[0011] Preferably, the position and number of the injection units in the injection assembly relative to the moving beam are the same as the position and number of the probe units in the probe assembly relative to the moving beam.

[0012] Preferably, the injection unit includes a syringe barrel body, an injection needle, and an injection needle hydraulic circuit. The top of the injection needle is provided with an injection needle piston. The syringe barrel body includes an injection needle cavity. The injection needle cavity is divided into a rod cavity and a rodless cavity by the injection needle piston. The rod cavity of the injection needle cavity has a second oil inlet, and the rodless cavity of the injection needle cavity has a second oil outlet. One end of the injection needle hydraulic circuit is connected to the second oil inlet, and the other end is connected to the second oil outlet.

[0013] Preferably, the injection needle hydraulic circuit is provided with a second variable pump and a second stop valve; the second variable pump and the second stop valve are both communicatively connected to the controller.

[0014] Preferably, the rotary encoder of the probe unit detects the movement of the probe and transmits the movement data to the controller. The controller controls the second variable pump on the injection unit at the corresponding position of the injection assembly to fill the rod cavity of its injection needle cavity with oil. The amount of oil filled ensures that the injection needle is lifted the same amount relative to its injection syringe barrel.

[0015] The beneficial effects of the present invention are: 1. A probe unit is set in front of the injection unit to detect the position and depth of bones on meat products, and control the injection needle at the same position to actively move, thus avoiding damage to the injection needle tip by bones in meat products. At the same time, only the probe needs to be replaced, avoiding frequent replacement of the needle tip; 2. The probe head passively contacts the bone in the meat product. At this time, the probe can overcome the back pressure and move upward relatively. The movement of the probe is detected by the rotary encoder of the probe unit, and the movement data is transmitted to the controller, thereby realizing the synchronous detection of the bone position and depth. At the same time, the controller controls the second variable pump on the injection unit at the corresponding position of the injection assembly to fill the rod cavity of its injection needle cavity with oil. The oil filling amount ensures that the injection needle is lifted by the same amount relative to the injection syringe barrel, and then the second stop valve is closed to avoid hard contact between the injection needle and the bone. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the pickled meat brine injection mechanism of the present application; Figure 2 is a schematic diagram of the structure of the probe assembly of the present application; Figure 3 It is a schematic diagram of the structure of the injection assembly of the present application; In the figure: crossbeam 100, conveyor belt 200, meat product M, probe assembly 1, injection assembly 2, slide rail 101, drive mechanism 102, movable beam 103, probe cylinder 11a, probe 11b, probe hydraulic circuit 11c, liquid supply beam 104, limit rod 106, spring 107, pressure plate 105, probe piston 17, first through hole 13, probe cavity 12, probe cavity sealing ring 14, first oil outlet 12b, first oil inlet 12a, first variable pump 11d, first stop valve 15, adjustable flow valve 16, bone B, injection unit 21, injection syringe cylinder 21a, injection needle 21b, injection needle hydraulic circuit 21c, injection needle piston 27, outlet 211, second through hole 23, cavity 231, liquid supply channel 1041, injection needle cavity sealing ring 24, sealing plug 21e, second variable pump 21d, second stop valve 25. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0018] like Figure 1The figure shows a schematic diagram of the pickled meat brine injection mechanism of the present invention. It includes a crossbeam 100, a horizontal transmission conveyor belt 200 is arranged below the crossbeam 100, and the meat product M that has not been injected with brine is laid on the conveyor belt 200. The crossbeam 100 is arranged along the conveying direction of the conveyor belt 200, and a probe assembly 1 and a plurality of injection assemblies 2 are longitudinally arranged on the crossbeam 100. The probe assembly 1 and the injection assembly 2 are both slidably arranged on the crossbeam 100 through a slide rail 101, and a driving mechanism 102 for driving the probe assembly 1 and the injection assembly 2 to slide longitudinally is also arranged on the crossbeam 100. The driving mechanism 102 can adopt a conventional gear rack driving structure, a screw nut driving structure, or a structure directly driven by a cylinder, a hydraulic cylinder, or an electric cylinder.

[0019] Along the conveying direction of the conveyor belt 200, the meat product M first passes through the probe assembly 1 and then passes through the injection assembly 2. When the meat product M is located below the probe assembly 1, the probe assembly 1 is driven by the driving mechanism 102 to be pressed down longitudinally, and the possible presence of hard bones, cartilage, etc. in the meat product M is detected by the probe assembly 1. When the meat product M moves below the injection assembly 2, the injection assembly 2 is driven by the driving mechanism 102 to be pressed down longitudinally, and saline is injected into the meat product M through the injection assembly 2.

[0020] The present invention is also provided with a controller (not shown). The controller adopts a conventional PLC controller structure. The controller is controlled and connected with the probe assembly 1 and each injection assembly 2. After the probe assembly 1 detects that there are hard bones, cartilage and other difficult-to-penetrate positions at the corresponding positions of the meat product M, the corresponding information is transmitted to the controller. The controller controls the injection assembly 2 to take measures to retract the needle at the corresponding position in the injection assembly 2 in advance to avoid hard contact between the needle at this position and the hard bones and cartilage.

[0021] like Figure 2The structure diagram of the probe assembly 1 of the present invention is shown. As shown in the figure, the probe assembly 1 includes a moving beam 103, and the moving beam 103 is fixedly connected to the output end of the driving mechanism 102, and the two ends of the moving beam 103 are slidably arranged on the slide rails 101 on both sides. A plurality of probe units 11 are arranged longitudinally on the moving beam 103. The probe unit 11 includes a probe cylinder 11a, a probe 11b, and a probe hydraulic circuit 11c. The top end of the probe cylinder 11a is fixedly set on the moving beam 103, and the lower end of the probe cylinder 11a is fixedly connected to the liquid supply beam 104, and a pressure plate 105 is connected below the liquid supply beam 104 through a limit rod 106 and a spring 107. The top end of the limit rod 106 is penetrated on the liquid supply beam 104, and the limit rod 106 can slide relative to the liquid supply beam 104. At the same time, the top end of the limit rod 106 has an enlarged portion to achieve limiting, so as to prevent the limit rod 106 from escaping from the liquid supply beam 104. The lower end of the limit rod 106 is fixedly connected to the upper side of the pressing plate 105, and the spring 107 is sleeved on the rod body of the limit rod 106 between the pressing plate 105 and the liquid supply beam 104. The probe 11b is slidably installed inside the probe cylinder 11a, and the lower end of the probe 11b is inserted into the through hole on the pressing plate 105. When the driving mechanism 102 drives the moving beam 103 to press down, the moving beam 103 drives the probe unit 11 to press down, and the pressing plate 105 first contacts the meat product M below. As the moving beam 103 moves further downward, the probe 11b extends from the pressing plate 105 and penetrates into the meat product M.

[0022] The top of the probe 11b is provided with a probe piston 17 that expands relative to the needle body. The needle body of the probe 11b moves in the first through hole 13 at the lower end of the probe cylinder 11a and extends outward. The probe cylinder 11a has a probe cavity 12 for the probe piston 17 to move. The probe piston 17 slides up and down in the probe cavity 12, and the shape of the probe piston 17 matches the inner wall of the probe cavity 12. The bottom of the probe cavity 12 is provided with a probe cavity sealing ring 14 for sealing the probe cavity 12. The top of the probe cavity 12, that is, the rodless cavity of the probe cavity 12 is provided with a first oil outlet 12b, and the bottom of the probe cavity 12, that is, the rod cavity of the probe cavity 12 is provided with a first oil inlet 12a. One end of the probe hydraulic circuit 11c is connected to the first oil inlet 12a, and the other end is connected to the first oil outlet 12b. The probe hydraulic circuit 11c is provided with a first variable pump 11d, a first stop valve 15 and an adjustable flow valve 16. The rod chamber, rodless chamber and probe hydraulic circuit 11c of the probe chamber 12 are all filled with hydraulic oil. The first variable pump 11d can be driven to fill and drain the rod chamber and rodless chamber of the probe chamber 12 in positive and negative directions. When the first variable pump 11d fills the rod chamber of the probe chamber 12 with oil, the probe 11b actively moves upward, and vice versa. Figure 2As shown, when the probe 11b is pressed down, after the head of the probe 11b touches the bone B, the probe 11b moves up relative to the probe barrel 11a, and the probe piston 17 delivers the hydraulic oil in the rodless chamber to the rod chamber through the first oil outlet 12b, the adjustable flow valve 16, the first stop valve 15, the first variable pump 11d, and the first oil inlet 12a. During this process, the first variable pump 11d is not driven, and its pump shaft (not shown) is driven by the hydraulic oil to rotate. A rotary encoder is set at its pump shaft to detect the number of rotations of the pump shaft to detect the movement of the probe 11b, so that the presence of hard substances such as bones at the probe 11b can be detected, and the relative depth of the bone hard substance can be detected at the same time. The rotary encoder of each probe 11b is connected to the controller for communication, and the needle contact status and displacement data of the corresponding probe 11b position are transmitted to the controller.

[0023] In the above-mentioned probe hydraulic circuit 11c, an adjustable flow valve 16 is provided for adjusting the back pressure in the probe hydraulic circuit 11c. The back pressure prevents the probe 11b from moving upward during the insertion of the meat product M. The probe 11b will only move upward when the resistance is greater than the back pressure when it contacts the bone. The first stop valve 15 is used to switch the probe hydraulic circuit 11c on and off. After each time the probe assembly 1 is pressed down, the first variable pump 11d of each probe unit 11 fills the rodless chamber with oil to reset the probe 11b to the lowest position.

[0024] like Figure 3 The figure shows a schematic diagram of the structure of the injection assembly 2 of the present invention. The injection assembly 2 has the same structure as the probe assembly 1, except that the injection unit 21 in the injection assembly 2 replaces the probe unit 11. The position and quantity of the injection unit 21 in the injection assembly 2 relative to the moving beam 103 are the same as the position and quantity of the probe unit 11 in the probe assembly 1 relative to the moving beam 103, and they have a one-to-one correspondence.

[0025] Similarly, the injection unit 21 is a cylinder-piston structure like the probe unit 11. The injection unit 21 includes an injection syringe cylinder 21a, an injection needle 21b, and an injection needle hydraulic circuit 21c. The top of the injection syringe cylinder 21a is fixedly arranged on the moving beam 103, and the lower end of the injection syringe cylinder 21a is fixedly connected to the liquid supply beam 104. The top of the injection needle 21b has an injection needle piston 27, and the needle body of the injection needle 21b is a hollow structure, and an outlet 211 is provided near the bottom needle head. The bottom of the injection needle piston 27 has a needle body, and the needle body passes through the second through hole 23 at the bottom of the injection syringe cylinder 21a. The bottom of the second through hole 23 has a spherical cavity 231, and the part of the needle body of the injection needle 21b located in the second through hole 23 has a saline inlet 212. The liquid supply beam 104 is provided with a liquid supply channel 1041, which is connected to an external saline supply device. The liquid supply channel 1041 is also connected to the cavity 231 on each injection unit 21, and the size of the second through hole 23 is slightly larger than the size of the needle body of the injection needle 21b. The external saline supply device distributes saline into the cavity 231 of each injection unit 21 through the liquid supply channel 1041 of the liquid supply beam 104, and then the saline flows from the inlet 212 into the injection needle 21b, flows out from the outlet 211, and is injected into the meat product M.

[0026] The syringe body 21a includes a syringe cavity 22, which is divided into a rod cavity and a rodless cavity by a syringe piston 27. The rod cavity of the syringe cavity 22 has a syringe cavity sealing ring 24, and the upper end of the second through hole 23 is sealed by the syringe cavity sealing ring 24, and the lower end is sealed by a sealing plug 21e. Similarly, the rod cavity of the syringe cavity 22 has a second oil inlet 22a, and the rodless cavity of the syringe cavity 22 has a second oil outlet 22b. One end of the syringe hydraulic circuit 21c is connected to the second oil inlet 22a, and the other end is connected to the second oil outlet 22b. The rod cavity and the rodless cavity of the syringe cavity 22 and the syringe hydraulic circuit 21c are all filled with hydraulic oil. The syringe hydraulic circuit 21c is provided with a second variable pump 21d and a second stop valve 25. The second variable pump 21d and the second stop valve 25 are both connected to the controller for communication. When the second variable pump 21d fills the rod chamber of the injection needle cavity 22 with oil, the injection needle 21b can be moved upward relative to the injection needle cylinder 21a. At the same time, the second variable pump 21d receives the control of the controller to quantitatively fill the rod chamber with oil, and can move the injection needle 21b upward relative to the injection needle cylinder 21a by a controllable displacement. When the second variable pump 21d fills the rodless chamber with oil, the injection needle 21b is reset to the lowest position relative to the injection needle cylinder 21a. The second stop valve 25 is controlled by the controller to open and close the injection needle hydraulic circuit 21c. When the second stop valve 25 is controlled to close, the flow paths of the rod chamber and the rodless chamber of the injection needle cavity 22 are cut off, and the injection needle 21b is maintained at a specific position during the insertion of the meat product M.

[0027] Combine the following Figure 1-3 The working process of the present invention is described.

[0028] Along the conveying direction of the conveyor belt 200, the meat product M first passes through the probe assembly 1 and then passes through the injection assembly 2. When the meat product M is located below the probe assembly 1, the probe assembly 1 is driven by the driving mechanism 102 to be pressed down longitudinally. Due to the existence of the back pressure of the adjustable flow valve 16, the probe 11b of each probe unit 11 in the probe assembly 1 is inserted downward into the meat product M. If the head of one of the probes 11b contacts the bone B in the meat product M, taking the second probe unit 11 from the left as an example, at this time, the probe 11b overcomes the back pressure and moves upward relatively, and the rotary encoder of the probe unit 11 detects the movement amount of the probe 11b and transmits the movement amount data to the controller. At this time, the controller controls the second variable pump 21d on the injection unit 21 at the corresponding position of the injection assembly 2 to fill the rod cavity of its injection needle cavity 22 with oil, and the amount of oil filling ensures that its injection needle 21b is lifted by the same amount relative to its injection syringe barrel 21a, and then closes the second stop valve 25. Then, when the meat product M moves to the bottom of the injection assembly 2, the moving beam 103 presses down each injection unit 21. Since the injection needle 21b of the injection unit 21 at this position has moved up by a corresponding amount in advance, the needle head of the injection needle 21b at this position will not make hard contact with the bone B at this position on the meat product M, thereby preventing the needle head from being damaged. After the saline injection is completed, the moving beam 103 moves up, and after the needle head is separated from the meat product M, the second variable pump 21d fills the rodless chamber, and resets the injection needle 21b to the lowest position relative to the injection needle barrel 21a.

[0029] In the above manner, a probe unit is arranged in front of the injection unit, and the position and depth of bones on the meat product are detected by the probe unit, and the injection needle at the same position is controlled to actively move, thereby avoiding damage to the injection needle tip by bones in the meat product.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pickled meat brine injection mechanism, characterized in that: It includes a crossbeam, a horizontal transmission conveyor belt is arranged under the crossbeam, and a probe assembly and a plurality of injection assemblies are longitudinally arranged on the crossbeam; a driving mechanism for driving the probe assembly and the injection assembly to slide longitudinally is also arranged on the crossbeam; the probe assembly and the injection assembly are both slidably arranged on the crossbeam through slide rails, and along the transmission direction of the conveyor belt, the meat product first passes through the probe assembly and then passes through the injection assembly; a controller is also arranged, and the controller is controlled and connected with the probe assembly and each injection assembly. After detecting the hard bone position and depth of the meat product, the probe assembly transmits the hard bone position and depth to the controller, and the controller controls the needle at the corresponding position of the injection assembly to actively retract the corresponding depth in advance.

2. A pickled meat brine injection mechanism as claimed in claim 1, characterized in that: The probe assembly comprises a moving beam, which is fixedly connected to the output end of the driving mechanism, and two ends of the moving beam are slidably arranged on slide rails on both sides; a plurality of probe units are longitudinally arranged on the moving beam.

3. A pickled meat brine injection mechanism as claimed in claim 2, characterized in that: The probe unit includes a probe cylinder, a probe, and a probe hydraulic circuit; the top of the probe cylinder is fixedly arranged on the moving beam, the lower end of the probe cylinder is fixedly connected to the liquid supply beam, and a pressure plate is connected below the liquid supply beam through a limit rod and a spring.

4. A pickled meat brine injection mechanism as claimed in claim 3, characterized in that: The top of the probe has a probe piston that expands relative to the needle body. The needle body of the probe moves in the first through hole at the lower end of the probe cylinder and extends outward. The inside of the probe cylinder has a probe cavity for the probe piston to move. The probe piston slides up and down in the probe cavity, and the shape of the probe piston matches the inner wall of the probe cavity.

5. A pickled meat brine injection mechanism as claimed in claim 4, characterized in that: The rodless cavity at the top of the probe cavity is provided with a first oil outlet, and the rod cavity at the bottom of the probe cavity is provided with a first oil inlet; one end of the probe hydraulic circuit is connected to the first oil inlet, and the other end is connected to the first oil outlet; the probe hydraulic circuit is provided with a first variable pump, a first stop valve and an adjustable flow valve.

6. A pickled meat brine injection mechanism as claimed in claim 5, characterized in that: A rotary encoder is arranged at the pump shaft of the first variable displacement pump, and the rotary encoder is communicatively connected with the controller.

7. A pickled meat brine injection mechanism as claimed in claim 6, characterized in that: The position and number of the injection units in the injection assembly relative to the moving beam are the same as the position and number of the probe units in the probe assembly relative to the moving beam.

8. A pickled meat brine injection mechanism as claimed in claim 7, characterized in that: The injection unit includes a syringe barrel body, an injection needle, and an injection needle hydraulic circuit. The top of the injection needle is provided with an injection needle piston. The syringe barrel body includes an injection needle cavity. The injection needle cavity is divided into a rod cavity and a rodless cavity by the injection needle piston. The rod cavity of the injection needle cavity has a second oil inlet, and the rodless cavity of the injection needle cavity has a second oil outlet. One end of the injection needle hydraulic circuit is connected to the second oil inlet, and the other end is connected to the second oil outlet.

9. A pickled meat brine injection mechanism as claimed in claim 8, characterized in that: The injection needle hydraulic circuit is provided with a second variable pump and a second stop valve; the second variable pump and the second stop valve are both communicatively connected with the controller.

10. A pickled meat brine injection mechanism as claimed in claim 9, characterized in that: The rotary encoder of the probe unit detects the movement of the probe and transmits the movement data to the controller. The controller controls the second variable pump on the injection unit at the corresponding position of the injection assembly to fill the rod cavity of its injection needle cavity with oil. The amount of oil filled ensures that the injection needle is lifted the same amount relative to its injection syringe barrel.

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