A torsion shear bolt cold header

Abstract

The present disclosure relates to the technical field of cold header, and one embodiment of the present disclosure provides a torsion shear bolt cold header, which comprises a calibration device, and the calibration device comprises two side plates one. In the present disclosure, the design of the cooperation of the extrusion roller one and the extrusion roller two with the inclined surface of the positioning ring effectively corrects the bending deformation of the steel bar, and significantly improves the feeding smoothness; the circulating cooling and lubricating system composed of the water tank and the water jet head not only reduces the friction resistance between the steel bar and the mold, but also prolongs the service life of the equipment; through the cooperative control of the electric clamp and the cold header, the precise feeding and forming of the steel bar are realized, and the forming precision of the torsion shear ring groove is ensured. These improvements enable the equipment to stably process the bent steel bar, greatly improve the production efficiency and product quality; through the above technical scheme, the technical problem of easy deformation of the steel bar in the related art is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of cold heading machine technology, and more specifically, to a torsion shear type bolt cold heading machine. Background Technology

[0002] A cold heading machine for torsion-shear bolts is a type of cold forming equipment specifically designed for producing high-strength torsion-shear bolts. It belongs to the category of cold heading machines (cold heading forging machines). It uses a cold heading process (metal plastic forming at room temperature) to directly forge coils or bars into bolt heads and machine the threaded shank, ultimately forming a standard torsion-shear bolt.

[0003] As a flexible material with a large length-to-diameter ratio, reinforcing bars can indeed flex and deform (sag or bend) due to their own weight (gravity) during transportation or stacking if the spacing between support points is too large or the suspended portion is too long. Traditional torsion-shear bolt cold heading machines often encounter problems with the feeding of bent or irregular reinforcing bars, which can hinder smooth progress in the feeding wheels or guide rails, affecting production efficiency. Therefore, improvements are needed. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a torsion shear type cold heading machine for bolts, which solves the technical problem of easy deformation of reinforcing bars in related technologies.

[0005] According to one aspect, at least one embodiment of this disclosure provides a torque-shear type cold heading machine for bolts, including a calibration device. The calibration device includes two side plates, with a water tank welded between the inner sides of the two side plates. A compression roller 1 and a compression roller 2 are rotatably mounted between the inner sides of the side plates. There are a total of six sets of compression roller 2, with two compression roller 2 in each set. Positioning rings are welded to the outer sides of both ends of the two compression roller 2. The inner side of the positioning rings is designed with an inclined surface. The distance between the two compression roller 1 is equal to the distance between the two compression roller 2. A motor unit is provided on the right side of the side plate, and the output end of the motor unit is connected to the right end of the compression roller 1 by bolts.

[0006] According to another aspect, at least one embodiment of this disclosure also provides a torsion shear type cold heading machine, comprising: a water tank bolted to the outer side of the first side plate, the input end of the water tank extending into the interior of the water tank, a water pump bolted to the top of the water tank, a platform welded between the inner sides of the two first side plates, water spray heads evenly arranged below the platform, the upper end of the platform being connected to the upper end of the water pump via a water pipe, and the platform being located above the water tank.

[0007] According to another aspect, at least one embodiment of this disclosure also provides a torsion shear type cold heading machine, comprising: a slot is provided on the rear side of the water tank, an mounting plate is bolted on the rear side of the water tank, an insert plate is welded on the inner side of the mounting plate, a sealing strip is movably sleeved on the outer side of the insert plate, and three filter plates are bolted on the inner side of the insert plate, the number of the three filter plates gradually increasing from bottom to top.

[0008] According to another aspect, at least one embodiment of this disclosure also provides a torsion shear type cold heading machine, comprising: a cold heading device disposed at the front end of the side plate one, the cold heading device including a side plate two welded to the front end of the side plate one, the surface of the side plate two being provided with a cutting hole, the surface of the side plate two being provided with a cold heading hole located on one side of the cutting hole, a connecting plate welded to the front end of the side plate two, a side plate three welded to the front end of the connecting plate, a cylinder two bolted to the front end of the side plate three, a horizontal plate slidably mounted inside the side plate three, the output end of the cylinder two being bolted to the rear end of the horizontal plate, and cold heading heads adapted to the cold heading holes being uniformly disposed on the inner side of the horizontal plate.

[0009] According to another aspect, at least one embodiment of this disclosure also provides a cold heading machine for torsion shear bolts, comprising: a groove is provided on the front side of the second side plate, a linear module is slidably installed inside the groove, a connecting block is provided at the front end of the linear module, a long plate is welded below the connecting block, and electric clamps are uniformly arranged below the long plate.

[0010] According to another aspect, at least one embodiment of this disclosure also provides a torsion shear type cold heading machine, comprising: a cylinder 1 is bolted on the upper part of the side plate 2, and the output end of the cylinder 1 is bolted to the upper part of the linear module.

[0011] According to another aspect, at least one embodiment of this disclosure also provides a torsion shear bolt cold heading machine, comprising: a collection box disposed at the right end of the connecting plate, the collection box being located at the right end of the long plate.

[0012] According to another aspect, at least one embodiment of this disclosure also provides a cold heading machine for torsion shear bolts, comprising: the sealing strip being an elastic structure with a trapezoidal cross-section.

[0013] According to another aspect, at least one embodiment of this disclosure also provides a cold heading machine for torsion shear bolts, comprising: a water level sensor disposed inside the water tank, and the input end of the pumping tank being connected to the water tank via a solenoid valve.

[0014] According to another aspect, at least one embodiment of this disclosure also provides a torsion shear type cold heading machine, including: a displacement sensor is provided on the horizontal plate, and the second cylinder is a servo cylinder, the control end of which is connected to the displacement sensor signal.

[0015] The beneficial effects of the embodiments disclosed herein are as follows:

[0016] This disclosure utilizes an inclined surface design for the compression rollers (first and second) and positioning ring to effectively correct the bending deformation of the reinforcing bars, significantly improving feeding smoothness. The circulating cooling and lubrication system, consisting of a water tank and spray nozzles, not only reduces the frictional resistance between the reinforcing bars and the mold but also extends the equipment's service life. Through the coordinated control of the electric clamp and cold heading head, precise feeding and forming of the reinforcing bars are achieved, ensuring the forming accuracy of the twist shear ring groove. These improvements enable the equipment to stably handle bent reinforcing bars, greatly improving production efficiency and product quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the extrusion roller of this utility model;

[0020] Figure 3 This is a schematic diagram of the second extrusion roller of this utility model;

[0021] Figure 4 This is a schematic diagram of the water tank of this utility model;

[0022] Figure 5 This is a schematic diagram of the filter plate of this utility model;

[0023] Figure 6 This is a schematic diagram of the cold heading device of this utility model;

[0024] Figure 7 This is a front view schematic diagram of the cold heading device of this utility model.

[0025] In the diagram: 1. Calibration device; 101. Side plate one; 102. Water tank; 103. Extrusion roller one; 104. Motor unit; 105. Water tank; 106. Water pump; 107. Water pipe; 108. Platform; 109. Spray head; 110. Extrusion roller two; 111. Positioning ring; 112. Slot; 113. Mounting plate; 114. Insert plate; 115. Sealing strip; 116. 1. Filter plate; 2. Cold heading device; 201. Side plate two; 202. Cutting hole; 203. Connecting plate; 204. Slide groove; 205. Linear module; 206. Cylinder one; 207. Connecting block; 208. Long plate; 209. Electric clamp; 210. Cold heading hole; 211. Side plate three; 212. Cylinder two; 213. Horizontal plate; 214. Cold heading head; 3. Collection box. Detailed Implementation

[0026] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0027] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0028] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0029] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] like Figures 1-7 As shown, a torsion shear type cold heading machine for bolts according to an embodiment of the present disclosure is illustrated. It includes a calibration device 1, which includes two side plates 101. A water tank 102 is welded between the inner sides of the two side plates 101. A pressing roller 103 and a pressing roller 110 are rotatably mounted between the inner sides of the side plates 101. There are a total of six sets of pressing rollers 110, with two pressing rollers 110 in each set. Positioning rings 111 are welded to the outer sides of both ends of the two pressing rollers 110. The inner side of the positioning rings 111 is designed with an inclined surface. The distance between the two pressing rollers 103 is equal to the distance between the two pressing rollers 110. A motor unit 104 is provided on the right side of the side plate 101. The output end of the motor unit 104 is connected to the right end of the pressing roller 103 by bolts.

[0033] The reinforcing bars are first fed into the straightening system via a feeding mechanism. This system consists of two sets of main extrusion rollers 103 and six sets of auxiliary extrusion rollers 110. The positioning rings 111 welded to both ends of the extrusion rollers 110 feature an inclined surface design to ensure precise alignment of the reinforcing bars during straightening. During straightening, the platform 108 sprays cooling and lubricating fluid onto the surface of the reinforcing bars through evenly distributed water nozzles 109, effectively reducing frictional heat and improving straightening quality. Simultaneously, the water tank 105, in conjunction with a filtration system, continuously recovers and purifies the used coolant, achieving recycling. The straightened steel bar is precisely fed into the cold heading device 2. First, the length is positioned by the fixed-length cutting mechanism at the cutting hole 202. The cut steel bar segment is then clamped by the electric clamp 209 and sent into the cold heading station. The cold heading hole 210 ensures accurate positioning of the steel bar. The cylinder 212 precisely controls the movement of the horizontal plate 213, driving multiple cold heading heads 214 to simultaneously complete the multi-station cold heading of the bolt head and form a standard torsion shear groove structure at the tail of the bolt in one go. The formed bolt product is smoothly transferred to the collection box 3 by the electric clamp 209.

[0034] By designing the inclined surfaces of extrusion rollers 103 and 110 in conjunction with the positioning ring 111, the bending deformation of the reinforcing bars is effectively corrected, significantly improving feeding smoothness. The circulating cooling and lubrication system, consisting of a water tank 102 and a water spray head 109, not only reduces the frictional resistance between the reinforcing bars and the mold but also extends the equipment's service life. Through the coordinated control of the electric clamp 209 and the cold heading head 214, precise feeding and forming of the reinforcing bars are achieved, ensuring the forming accuracy of the twist shear ring groove. These improvements enable the equipment to stably handle bent reinforcing bars, significantly improving production efficiency and product quality.

[0035] like Figures 1-7 As shown, a torsion shear type cold heading machine of the present disclosure is illustrated in another embodiment. A water tank 105 is bolted to the outer side of the side plate 101. The input end of the water tank 105 extends into the interior of the water tank 102. A water pump 106 is bolted to the top of the water tank 105. A platform 108 is welded between the inner sides of the two side plates 101. Water spray heads 109 are evenly arranged below the platform 108. The upper end of the platform 108 is connected to the upper end of the water pump 106 through a water pipe 107. The platform 108 is located above the water tank 102.

[0036] In some examples, the structure forms a complete coolant circulation system. The water tank 105 can transport the coolant in the water tank 102 to the spray head 109 under the platform 108 through the water pipe 107 to achieve uniform cooling and lubrication of the steel bars. This design can effectively reduce the friction temperature between the steel bars and the mold, prevent the material from overheating and deforming, and also clean impurities from the surface of the steel bars.

[0037] like Figures 1-7 As shown, a cold heading machine for twist-shear bolts is provided in another embodiment of the present disclosure. A slot 112 is provided on the rear side of the water tank 105. An mounting plate 113 is bolted on the rear side of the water tank 105. An insert plate 114 is welded on the inner side of the mounting plate 113. A sealing strip 115 is movably sleeved on the outer side of the insert plate 114. Three filter plates 116 are bolted on the inner side of the insert plate 114. The number of the three filter plates 116 gradually increases from bottom to top.

[0038] In some examples, the filtration system uses a gradient arrangement of multiple filter plates 116 to filter metal debris and impurities in the coolant in stages. The elastic design of the sealing strip 115 ensures a tight seal between the insert plate 114 and the slot 112, preventing coolant leakage; the increasing number of filter plates from bottom to top forms a progressive filtration, with the upper fine filter effectively trapping tiny particles, maintaining coolant cleanliness, and extending equipment lifespan.

[0039] like Figures 1-7As shown, a cold heading machine for twist-shear bolts is provided at the front end of a side plate 101. The cold heading device 2 includes a side plate 201 welded to the front end of the side plate 101. The surface of the side plate 201 is provided with a cutting hole 202 and a cold heading hole 210 located on one side of the cutting hole 202. A connecting plate 203 is welded to the front end of the side plate 201, and a side plate 3 211 is welded to the front end of the connecting plate 203. A cylinder 212 is bolted to the front end of the side plate 3 211. A horizontal plate 213 is slidably installed inside the side plate 3 211. The output end of the cylinder 212 is bolted to the rear end of the horizontal plate 213. Cold heading heads 214 adapted to the cold heading holes 210 are evenly arranged on the inner side of the horizontal plate 213.

[0040] In some examples, the cold heading device drives the horizontal plate 213 through cylinder 212 to move multiple cold heading heads 214 synchronously, which can complete the multi-station forming of the bolt head in one go; the precise fit between the cold heading hole 210 and the cold heading head 214 ensures the forming dimensional accuracy, and the rigid frame formed by the connecting plate 203 and the side plate 211 provides stable support, making the stamping process smooth and reliable, and effectively improving the forming quality and consistency of the bolt head.

[0041] like Figures 1-7 As shown, a cold heading machine for twist-shear bolts is provided in another embodiment of the present disclosure. A groove 204 is provided on the front side of the side plate 201. A linear module 205 is slidably installed inside the groove 204. A connecting block 207 is provided at the front end of the linear module 205. A long plate 208 is welded below the connecting block 207. Electric clamps 209 are evenly arranged below the long plate 208.

[0042] In some examples, the linear module 205 drives the connecting block 207 to move the long plate 208, enabling the electric clamp 209 to accurately clamp and transport the rebar segments; the chute 204 provides precise guidance for the linear module 205 to ensure the straightness of the feeding; the multi-point electric clamp 209 arrangement of the long plate 208 can realize continuous feeding and improve production efficiency; this modular design makes it easy to adjust the feeding stroke to adapt to the production needs of bolts of different lengths.

[0043] like Figures 1-7 As shown, a torsion shear type cold heading machine for bolts is illustrated in another embodiment of this disclosure. A cylinder 206 is bolted on the upper part of the side plate 201, and the output end of the cylinder 206 is bolted to the upper part of the linear module 205.

[0044] In some examples, cylinder 206 and linear module 205 form a composite drive system. The cylinder provides initial rapid propulsion, while the module achieves precise positioning. The two work together to ensure both feeding speed and positioning accuracy.

[0045] like Figures 1-7 As shown, a torsion shear type cold heading machine for bolts is provided at the right end of the connecting plate 203, and the collecting box 3 is located at the right end of the long plate 208.

[0046] In some examples, the collection box 3 is located below the long plate 208, and the forming bolts are automatically slid into the box after being released by the electric clamp 209; the box body adopts an inclined material guiding design, which, together with the buffer pad, can avoid damage to the bolt surface.

[0047] like Figures 1-7 As shown, it illustrates a torsion shear bolt cold heading machine in another embodiment of this disclosure, wherein the sealing strip 115 is an elastic structure with a trapezoidal cross-section.

[0048] In some examples, the trapezoidal cross-section sealing strip 115 produces a dual radial and axial sealing effect when under pressure, which is more reliable than a conventional rectangular seal.

[0049] like Figures 1-7 As shown, it illustrates a torsion shear type cold heading machine for bolts in another embodiment of this disclosure. A water level sensor is installed inside the water tank 102, and the input end of the pumping tank 105 is connected to the water tank 102 via a solenoid valve.

[0050] In some examples, the intelligent water level control system monitors the water level in tank 102 in real time through sensors. When the water level is too low, it automatically closes the solenoid valve of pump tank 105 to prevent the pump from running dry and being damaged.

[0051] like Figures 1-7 As shown, it illustrates a torsion shear type cold heading machine for bolts in another embodiment of this disclosure. A displacement sensor is provided on the horizontal plate 213, and the second cylinder 212 is a servo cylinder, whose control end is connected to the displacement sensor signal.

[0052] In some examples, the closed-loop control system uses a displacement sensor to provide real-time feedback on the position of the cross plate 213, and the cylinder 212 adjusts the output force and stroke accordingly.

[0053] Working principle and usage process of this utility model:

[0054] The reinforcing bars are first fed into the straightening system via a feeding mechanism. This system consists of two sets of main extrusion rollers 103 and six sets of auxiliary extrusion rollers 110. The positioning rings 111 welded to both ends of the extrusion rollers 110 feature an inclined surface design to ensure precise alignment of the reinforcing bars during straightening. During straightening, the platform 108 sprays cooling and lubricating fluid onto the surface of the reinforcing bars through evenly distributed water nozzles 109, effectively reducing frictional heat and improving straightening quality. Simultaneously, the water tank 105, in conjunction with a filtration system, continuously recovers and purifies the used coolant, achieving recycling. The straightened steel bar is precisely fed into the cold heading device 2. First, the length is positioned by the fixed-length cutting mechanism at the cutting hole 202. The cut steel bar segment is then clamped by the electric clamp 209 and sent into the cold heading station. The cold heading hole 210 ensures accurate positioning of the steel bar. The cylinder 212 precisely controls the movement of the horizontal plate 213, driving multiple cold heading heads 214 to simultaneously complete the multi-station cold heading of the bolt head and form a standard torsion shear groove structure at the tail of the bolt in one go. The formed bolt product is smoothly transferred to the collection box 3 by the electric clamp 209.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A cold heading machine for torsion shear bolts, comprising a calibration device (1), characterized in that: The calibration device (1) includes two side plates (101), and a water tank (102) is welded between the inner sides of the two side plates (101). A first extrusion roller (103) and a second extrusion roller (110) are rotatably installed between the inner sides of the side plates (101). There are six sets of the second extrusion rollers (110), and each set has two second extrusion rollers (110). A positioning ring (111) is welded to the outer side of both ends of the two second extrusion rollers (110). The inner side of the positioning ring (111) is designed with an inclined surface. The distance between the two first extrusion rollers (103) is equal to the distance between the two second extrusion rollers (110). A motor group (104) is provided on the right side of the side plate (101). The output end of the motor group (104) is connected to the right end of the first extrusion roller (103) by bolts.

2. The cold heading machine for torque-shear type bolts according to claim 1, characterized in that: A water tank (105) is bolted to the outer side of the side plate (101). The input end of the water tank (105) extends into the interior of the water tank (102). A water pump (106) is bolted to the top of the water tank (105). A platform (108) is welded between the inner sides of the two side plates (101). Water nozzles (109) are evenly arranged below the platform (108). The upper end of the platform (108) is connected to the upper end of the water pump (106) through a water pipe (107). The platform (108) is located above the water tank (102).

3. The cold heading machine for torque-shear type bolts according to claim 2, characterized in that: The water tank (105) has a slot (112) on its rear side. The water tank (105) is bolted to a mounting plate (113). The mounting plate (113) is welded to the inner side of the mounting plate (113). The outer side of the mounting plate (114) is movably fitted with a sealing strip (115). The inner side of the mounting plate (114) is bolted to three filter plates (116). The number of the three filter plates (116) gradually increases from bottom to top.

4. The cold heading machine for torque-shear type bolts according to claim 1, characterized in that: The front end of the first side plate (101) is provided with a cold heading device (2), the cold heading device (2) includes a second side plate (201) welded to the front end of the first side plate (101), the surface of the second side plate (201) is provided with a cutting hole (202), the surface of the second side plate (201) is provided with a cold heading hole (210) located on one side of the cutting hole (202), and a connecting plate (203) is welded to the front end of the second side plate (201). The front end of the connecting plate (203) is welded with a side plate three (211), and a cylinder two (212) is bolted to the front end of the side plate three (211). A horizontal plate (213) is slidably installed inside the side plate three (211). The output end of the cylinder two (212) is bolted to the rear end of the horizontal plate (213). Cold heading heads (214) that are adapted to the cold heading holes (210) are evenly arranged on the inner side of the horizontal plate (213).

5. A cold heading machine for torsion shear bolts according to claim 4, characterized in that: The front side of the second side plate (201) is provided with a sliding groove (204), and a linear module (205) is slidably installed inside the sliding groove (204). A connecting block (207) is provided at the front end of the linear module (205), and a long plate (208) is welded below the connecting block (207). Electric clamps (209) are evenly arranged below the long plate (208).

6. A cold heading machine for torsion shear bolts according to claim 5, characterized in that: A cylinder (206) is bolted on the upper part of the second side plate (201), and the output end of the cylinder (206) is bolted to the upper part of the linear module (205).

7. A cold heading machine for torsion shear bolts according to claim 6, characterized in that: A collection box (3) is provided at the right end of the connecting plate (203), and the collection box (3) is located at the right end of the long plate (208).

8. A cold heading machine for torque-shear type bolts according to claim 3, characterized in that: The sealing strip (115) is an elastic structure with a trapezoidal cross-section.

9. A cold heading machine for torsion shear bolts according to claim 2, characterized in that: The water tank (102) is equipped with a water level sensor, and the input end of the pumping tank (105) is connected to the water tank (102) through a solenoid valve.

10. A cold heading machine for torsion shear bolts according to claim 4, characterized in that: A displacement sensor is provided on the horizontal plate (213), and the second cylinder (212) is a servo cylinder, whose control end is connected to the displacement sensor signal.

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